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SDLRC - Scientific Articles all years by Author - Ro+


The Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcementscalled the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Resource Center
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A B C D-Diam Diamonds Diamr+ E F G H I J K L M N O P Q R S T U V W X Y Z
Tips for Users
Posted/Published Reference CodesThe SDLRC provides 3 types of references identified in the reference code. DS for scientific article, DM for a media article, and DC for a corporate announcement. Consider DS0512-0001. The DS stands for "diamond scientific". 05 stands for 2005, the year the reference was posted. 12 represents the month the reference was posted. For all years prior to 2015 the default month is 12. -0001 is the reference's identifier and it does not mean anything. The number below the refence code, ie 2015, is the year the article was published. Note that the posted year may sometimes be later than the published year.
Sort OrderReferences are sorted by the "author" name and when the reference was posted to the compilation.
Most RecentIf the reference code is highlighted yellow, the reference was made available through the most recent monthly compilation of new literature. Use this to check out new references. When new references are posted, we make it our priority to track down an online link and obtain an abstract. With regard to older references, tracking down an abstract and an online link is a work in progress.
Link to external location of article: If the title has a link, it means we have found a location online where you can either retrieve the full article free, or purchase access to it. The Sheahan Diamond Literature Service is not a technical article procurement service; if you want a restricted article, you must deal directly with the vendor who controls the copyright to the article.
Searching this page for a specific term or authorIn your Firefox browser click Edit in the menu bar and then Find. In the Find box that shows up at the bottom of the web page enter your search term. Firefox will highlight all occurrences. This is particularly helpful when the author you are seeking was not the lead author by whom the compilation is sorted.
Sending or sharing a referenceThe left column (Posted/Published) has an embedded hyperlink for each reference. In Firefox, if you right click on it, you can obtain the link url for that reference's location within the page, which you can copy and paste into an email or any other document. You can also use the "share this link" option to tweet, facebook etc the link.
Author Index
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years - Ro+
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1992-1179
1992
Ro, H.E.Pedersen, T., Ro, H.E.Finite duration extension and decompression meltingEarth and Planetary Science Letters, Vol. 113, No. 1-2, September pp. 15-22MantleModel, Melt
DS1950-0426
1958
Roach, C.H.Shoemaker, E.M., Byers, F.M.JR., Roach, C.H.Diatremes on the Navajo and Hopi Reservation, Arizona. #1United States Geological Survey (USGS) SPECIAL Publishing, No. TEI-740, PP. 158-168.United States, Arizona, Rocky Mountains, Colorado PlateauDiatreme
DS1960-0294
1962
Roach, C.H.Shoemaker, E.M., Roach, C.H., Byers, F.M. JR.Diatremes and Uranium Deposits in the Hopi Buttes ArizonaGeological Society of America (GSA) SPECIAL VOLUME - BUDDINGTON Vol., PP. 327-355.GlobalRelated Rocks, Diatreme
DS1993-0457
1993
Roach, D.E.Fowler, A.D., Roach, D.E.Dimensionality analysis of time-series data: nonlinear methodsComputers and Geosciences, Vol. 19, No. 1, pp. 41-52GlobalComputer applications, Fractals
DS1996-1193
1996
Roach, I.C.Roach, I.C.Evidence for modal mantle metasomatism in the Monaro volcanic province southeastern New South Wales.Geological Society of Australia 13th. Convention held Feb., No. 41, abstracts p. 365.AustraliaXenoliths, Alkalic rocks
DS200412-1675
2004
Roach, I.C.Roach, I.C.Mineralogy, textures and P-T relationships of a suite of xenoliths from the Monaro Volcanic Province, New South Wales, AustraliaJournal of Petrology, Vol. 45, 4, pp. 739-758.Australia, New South WalesXenoliths
DS1993-0774
1993
Roamnko, Ye.F.Kaminsky, F.V., Roamnko, Ye.F., Kolesnikov, S.K., Salkhi, M.Lamproites of northern AlgeriaInternational Geology Review, Vol. 35, No. 3, March pp. 235-252AlgeriaLamproites, Review
DS1996-1194
1996
Roback, R.C.Roback, R.C.Characterization and tectonic evolution of Mesoproterozoic island arc In the southern GrenvilleTectonophysics, Vol. 265, No. 1/2, Nov. 15, pp. 29-52GlobalLlano Uplift, Grenville Orogeny
DS2003-0519
2003
Robanowicz, B.Gung, Y., Panning, M., Robanowicz, B.Global anisotropy and the thickness of continentsNature, No. 6933, April 17, p. 707-710.MantleGeophysics
DS1993-0879
1993
Robarick, E.Langer, K., Robarick, E., Sobolev, N.V., Shatsky, V.S.Single crystal spectra of garnets from Diamondiferous high pressure metamorphic rocks from Kazakhstan -indications for OH-,H2O, and FeTi chargetransfer.European Journal of Mineralogy, Vol. 5, No. 6, Nov-Dec pp. 1091-1100.Russia, KazakhstanMetamorphic rocks, Mineralogy -garnets
DS1995-0422
1995
Robaudo, S.Dixon, T.H., Robaudo, S., Lee, J., Reheis, M.C.Constraints on present day Basin and Range deformation from space geodesyTectonics, Vol. 14, No. 4, August pp. 755-772Cordillera, Basin and RangeTectonics, Deformation zones
DS200712-0241
2006
Robb, L.Dewey, J.F., Robb, L., Van Schalkwyk, L.Did Bushmanland extensionally unroof Namaqualand?Precambrian Research, Vol. Nov. pp. 173-182.Africa, South AfricaUHT metamorphism
DS1992-1054
1992
Robb, L.J.Meyer, F.M., Robb, L.J., Reimold, W.U., de Bruyn, H.D.Sulphur and Iodine type granites during late stage magmatism in the Barberton Mountain Land, southern AfricaEconomic Geology Research Unit, University of of Witwatersrand, Information Circular No. 257, 18pSouth AfricaGranites, Magmatism
DS2002-1277
2002
Robb, L.J.Poujol, M., Robb, L.J., Anhaeusser, C.R., Gericke, B.Geochronologic constraints on the evolution of the Kaapvaal Craton, South AfricaEconomic Geology Research Institute, EGRU Wits, Information Circular, No. 360, 37p.South AfricaGeochronology, craton, terrane, magmatism - not specific to diamonds
DS2003-1098
2003
Robb, L.J.Poujol, M., Robb, L.J., Anhaeusser, C.R., Gericke, B.A review of the geochronological constraints on the evolution of the Kaapvaal CratonPrecambrian Research, Vol. 127, 1-2, Nov. pp. 181-213.South AfricaGeochronology
DS200412-1573
2003
Robb, L.J.Poujol, M., Robb, L.J., Anhaeusser, C.R., Gericke, B.A review of the geochronological constraints on the evolution of the Kaapvaal Craton, South Africa.Precambrian Research, Vol. 127, 1-2, Nov. pp. 181-213.Africa, South AfricaGeochronology
DS200612-0626
2006
Robb, L.J.Ishihara, S., Ohmoto, H., Anhaeusser, C.R., Imai, A., Robb, L.J.Discovery of the oldest oxidized granitoids in the Kaapvaal Craton and its implications for the redox evolution of early Earth.Geological Society of America Memoir, No. 198, pp. 67-80.Africa, South AfricaRedox
DS200612-1107
2005
Robb, L.J.Poujol, M., Kiefer, R., Robb, L.J., Anhaesser, C.R., Armstrong, R.A.New U pb dat a on zircons from the Amalia greenstone belt southern Africa: insights into the Neoarchean evolution of the Kaapvaal Craton.South African Journal of Geology, Vol. 108, 3, pp. 317-332.Africa, South AfricaGeochronology
DS201810-2318
2018
Robb, L.J.Gardiner, N.J., Searle, M.P., Morley, C.K., Robb, L.J., Whitehouse, M.J., Roberts, N.M.W., Kirkland, C.L., Spencer, C.J.The crustal architecture of Myanmar imaged through zircon U-Pb, Lu-Hf and O isotopes: tectonic and metallogenic implications. ReviewGondwana Research, Vol. 62, pp. 27-60.Asia, Myanmartectonics

Abstract: The Tethys margin in central and eastern Asia is comprised of continental terranes separated by suture zones, some of which remain cryptic. Determining the crustal architecture, and therefore the geological history, of the Eastern Tethyan margin remains challenging. Sited in the heart of this region, Myanmar is a highly prospective but poorly explored minerals jurisdiction. A better understanding of Myanmar's mineralization can only be realized through a better understanding of its tectonic history, itself reflected in at least four major magmatic belts. The Eastern and the Main Range Provinces are associated with the Late Permian to Early Triassic closure of Palaeo-Tethys. The Mogok-Mandalay-Mergui Belt and Wuntho-Popa Arc are a response to the Eocene closure of Neo-Tethys. However, magmatic ages outside these two orogenic events are also recorded. We present new zircon U-Pb, Lu-Hf and O isotope data from magmatic rocks across Myanmar, which we append to the existing dataset to isotopically characterize Myanmar's magmatic belts. Eastern Province Permian I-type magmatism has evolved eHf (-10.9 to -6.4), whilst Main Range Province Triassic S-type magmatism also records evolved eHf (-13.5 to -8.8). The Mogok-Mandalay-Mergui Belt is here divided into the Tin Province and the Mogok Metamorphic Belt. The Tin Province hosts ca. 77-50 Ma magmatism with evolved eHf (-1.2 to -15.2), and d 18 O of 5.6-8.3‰. The Mogok Metamorphic Belt exhibits a more complex magmatic and metamorphic history, and granitoids record Jurassic, Late Cretaceous, and Eocene to Miocene phases of magmatism, all of which exhibit evolved eHf values between -4.6 and -17.6, and d 18 O between 6.3 and 9.2‰. From the Tagaung-Myitkyina Belt, we report a magmatic age of 172 Ma and eHf of 18.1 to 10.8. To accommodate the geological evidence, we propose a tectonic model for Myanmar involving a greater Sibumasu - where the documented zircon isotopic variations reflect compositional variations in magmatic source - and invoke the role of a Tengchong Block. The Baoshan Block and Greater Sibumasu were likely assembled on or before the Triassic, a former Andean margin and suture which may lie across the Northern Shan Plateau, and reflected in isotopic differences between the northern and southern parts of the Mogok Metamorphic Belt. This contiguous Sibumasu-Baoshan Block then sutured onto the Indochina margin in the Late Triassic. We propose that a Tengchong Block within Myanmar provides for a southerly termination of the Meso-Tethys suture immediately north of the Mogok area. A discrete Tengchong Block may explain a discontinuous arc of Late Triassic to Jurassic I-type magmatism in central Myanmar, representing an Andean-type margin sited above a subducting Meso-Tethys on the margin of Sibumasu. The Tengchong Block sutured onto Greater Sibumasu before the Late Cretaceous, after which subduction of Neo-Tethys drove the magmatism of the Wuntho-Popa Arc and ultimately that of the Tin Province. The metallogenic character of granite belts in Myanmar reflects the crustal architecture of the region, which is remarkable for its prolific endowment of granite-hosted Sn-W mineralization in two quite distinct granite belts related to sequential Indosinian and Himalayan orogenesis.
DS1994-1466
1994
Robbins, P.Robbins, P.Guidelines for pricing control of South African mined productsRaw Materials Report, Vol. 10, No. 3, pp. 17-25South AfricaMining products, Economics
DS1991-1431
1991
Robbins, S.I.Robbins, S.I., Grow, I.A.Isostatic residual anomaly gravity maps - a comparison of local versus regional compensation models in WyomingGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 317WyomingGravity, Models
DS201112-0196
2011
Robbins, S.J.Collins, G.S., Elbeshausen, D., Davison, T.M., Robbins, S.J., Hynek, B.M.The size frequency distribution of ellipitical impact craters.Earth and Planetary Science Letters, Vol. 310, 1-2, pp. 1-8.GlobalImpact Crater
DS1991-1432
1991
Robbins, S.L.Robbins, S.L.Complete Bouguer anomaly gravity map of the Buffalo Quadrangle, Johnson and Campbell Counties, WyomingUnited States Geological Survey (USGS) Map, No. I-1923-B, 1: 100, 000 $ 3.10WyomingGeophysics -gravity, Map
DS1992-1280
1992
Roberds, W.J.Roberds, W.J.Environmental and economic risk assessment/management in mine developmentAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, Annual Meeting held Phoenix Arizona Feb. 24-27th. 1992, Preprint No. 92-149, 9pGlobalEconomics, Ore reserves, Legal, Environmental case study
DS201812-2823
2018
Roberge, J.Jerram, D.A., Sharp, T.H., Torsvik, T.H., Poulson, R., Watton, T.H., Freitag, U., Halton, A., Sherlock, S.C., Malley, J.A.S., Finley, A., Roberge, J., Swart, R., Fabregas, P., Ferreira, C.H., Machado, V.Volcanic constraints on the unzipping of Africa from South America: insights from new geochronological controls alone the Angola margin.Tectonophysics, doi.org/10.1016/ j.tecto.2018.07.027 33p.Africa, Angola, South Americageochronology

Abstract: The breakup of Africa from South America is associated with the emplacement of the Paraná-Etendeka flood basalt province from around 134 Ma and the Tristan da Cunha plume. Yet many additional volcanic events occur that are younger than the main pulse of the Paraná-Etendeka and straddle the rift to drift phases of the main breakup. This contribution reports on new geochronological constraints from the Angolan part of the African Margin. Three coastal and one inland section have been sampled stretching across some 400 Km, with 39Ar/40Ar, U-Pb and Palaeontology used to provide age constraints. Ages from the new data range from ~100 to 81 Ma, with three main events (cr. 100, 91 and 82-81 Ma). Volcanic events are occurring within the Early to Late Cretaceous, along this part of the margin with a general younging towards Namibia. With the constraints of additional age information both onshore and offshore Angola, a clear younging trend at the early stages of rift to drift is recorded in the volcanic events that unzip from North to South. Similar age volcanic events are reported from the Brazilian side of the conjugate margin, and highlight the need to fully incorporate these relatively low volume volcanic pulses into the plate tectonic breakup models of the South Atlantic Margin.
DS201412-0640
2014
Roberge, M.Novella, D., Frost, D.J., Hauri, E.H., Bureau, H., Raepsaet, C., Roberge, M.The distribution of H2O between silicate melt and nominally anhydrous peridotite and the onset of hydrous melting in the deep upper mantle.Earth and Planetary Science Letters, Vol. 400, pp. 1-13.MantleMelting
DS201706-1101
2017
Roberge, M.Roberge, M., Bureau, H., Bolfan-Casanova, N., Raepsaet, C., Surble, S., Khodja, H., Auzende, A-L., Cordier, P., Fiquet, G.Chlorine in wadsleyite and ringwoodite: an experimental study.Earth and Planetary Science Letters, Vol. 467, pp. 99-107.Mantlechlorine

Abstract: We report concentrations of Chlorine (Cl) in synthetic wadsleyite (Wd) and ringwoodite (Rw) in the system NaCl-(Mg,?Fe)2SiO4 under hydrous and anhydrous conditions. Multi-anvil press experiments were performed under pressures (14-22 GPa) and temperatures (1100-1400?°C) relevant to the transition zone (TZ: 410-670 km depth). Cl and H contents were measured using Particle Induced X-ray Emission (PIXE) and Elastic Recoil Detection Analysis (ERDA) respectively. Results show that Cl content in Rw and Wd is significantly higher than in other nominally anhydrous minerals from the upper mantle (olivine, pyroxene, garnet), with up to 490 ppm Cl in anhydrous Rw, and from 174 to 200 ppm Cl in hydrous Wd and up to 113 ppm Cl in hydrous Rw. These results put constrains on the Cl budget of the deep Earth. Based on these results, we propose that the TZ may be a major repository for major halogen elements in the mantle, where Cl may be concentrated together with H2OH2O and F (see Roberge et al., 2015). Assuming a continuous supply by subduction and a water-rich TZ, we use the concentrations measured in Wd (174 ppm Cl) and in Rw (106 ppm Cl) and we obtain a maximum value for the Cl budget for the bulk silicate Earth (BSE) of 15.1 × 1022 g Cl, equivalent to 37 ppm Cl. This value is larger than the 17 ppm Cl proposed previously by McDonough and Sun (1995) and evidences that the Cl content of the mantle may be higher than previously thought. Comparison of the present results with the budget calculated for F (Roberge et al., 2015) shows that while both elements abundances are probably underestimated for the bulk silicate Earth, their relative abundances are preserved. The BSE is too rich in F with respect to heavy halogen elements to be compatible with a primordial origin from chondrites CI-like (carbonaceous chondrites CC) material only. We thus propose a combination of two processes to explain these relative abundances: a primordial contribution of different chondritic-like materials, including EC-like (enstatite chondrites), possibly followed by a distinct fractionation of F during the Earth differentiation due to its lithophile behavior compared to Cl, Br and I.
DS1996-0088
1996
Roberston, A.D.Barron, B.J., Roberston, A.D., Sutherland, F.L.Olivine leucitites, their xenolith and megacryst suites, Hoskings north Queensland.Australian Journal of Earth Sciences, Vol. 43, No. 3, June 1, pp. 231-244.AustraliaLeucitites, Hoskings Peak area
DS1983-0199
1983
Roberston, C.Devries, R.C., Roberston, C.The Internal Structure of Diamond by Electrostatic Charging in the Scanning Electron Microscope (sem)Materials Research Bulletin, Vol. 18, No. 6, pp. 697-701GlobalDiamond Morphology
DS1985-0146
1985
Roberston, C.Devries, R.C., Roberston, C.The Microstructure of Ballas ( Polycrystalline Diamond) by Electrostatic Charging in the Scanning Electron Microscope (sem).Journal of MATERIALS SCIENCE LETTERS, Vol. 4, No. 6, JUNE PP. 805-807.GlobalBlank
DS1991-0366
1991
RobertDella Ventura, G., Robert, J-L, Beny, J-M.Tetrahedrally coordinated Ti4+ in sythetic Ti-rich potassic richterite:evidence from XRD, FTIR, and Raman studiesAmerican Mineralogist, Vol. 76, pp. 1134-1140GlobalExperimental petrology, Potassic richterite
DS1991-1433
1991
Robert, F.Robert, F., Sheahan, P.A., Green, S.B.Greenstone gold and crustal evolution, Nuna Conference held Val d'Or May1990Geological Association of Canada (GAC)/Mineral Deposits Division Publ, 237p. $ 25.00Quebec, Ontario, Australia, South AfricaGreenstone belt, Gold genesis
DS1992-1281
1992
Robert, F.Robert, F., Rejou-Michel, A., Javoy, M.Oxygen isotope homogeneity of the earth: new evidenceEarth and Planetary Science Letters, Vol. 108, No. 1/3. January pp. 1-10GlobalEarth, Geochronology
DS1993-1313
1993
Robert, F.Robert, F.The geometrical relationship between the stretching lineation and the movement direction of shear zones: discussionJournal of Structural Geology, Vol. 15, No. 2, pp. 239-240GlobalStructure, Shear zones
DS1998-0572
1998
Robert, F.Hanon, P., Robert, F., Chuassidon, M.High carbon concentrations in meteoritic chondrules: a record of metalsilicate differentiationGeochimica et Cosmochimica Acta, Vol. 62, No. 5, March pp. 903-913GlobalMeteorites, Chondrites
DS201508-0373
2015
Robert, F.Robert, F.Relevance and importance of research in mineral exploration.SEG Newsletter, No. 102, July, p. 7.TechnologyNot specific to diamonds but interesting reading!
DS1950-0021
1950
Robert, M.Droogmans, H., Robert, M., Maury, G.Atlas du KatangaBruxelles: Com. Spec. Du Katanga., Democratic Republic of Congo, Central AfricaGeology, Mineral Resources
DS201609-1716
2016
Robert, M.De Wit, M., Bhebhe, Z., Davidson, J., Haggerty, S.E., Hundt, P., Jacob, J., Lynn, M., Marshall, T.R., Skinner, C., Smithson, K., Stiefenhofer, J., Robert, M., Revitt, A., Spaggiari, R., Ward, J.Overview of diamonds resources in Africa.Episodes, Vol. 9, 2, pp. 198-238.AfricaDiamond resources - overview

Abstract: From the discovery of diamonds in South Africa in 1866 until the end of 2013, Africa is estimated to have produced almost 3.2 Bct out of a total global production of 5.03 Bct, or 63.6% of all diamonds that have ever been mined. In 2013 African countries ranked 2nd (Botswana), 3rd (DRC), 6th (Zimbabwe), 7th (Angola), 8th (South Africa), and 9th (Namibia), in terms of carat production and 1st (Botswana), 4th (Namibia), 5th (Angola), 6th (South Africa), 7th (Zimbabwe), and 9th (DRC), in terms of value of the diamonds produced. In 2013 Africa produced 70.6 Mct out of a global total of 130.5 Mct or 54.1%, which was valued at US$ 8.7 billion representing 61.5% of the global value of US$ 14.1 billion.
DS200612-0198
2006
Robert Charrue, C.Burkhard, M., Caritag, S., Helg, U., Robert Charrue, C., Soulaimani, A.Tectonics of the Anti-Atlas of Morocco.Comptes Rendus Geoscience, Vol. 338, 1-2, pp. 11-24.Africa, MoroccoTectonics
DS1989-1280
1989
Robert DaviesRobert DaviesDe Beers. Overview and profit forecast and ratingShearson Lehman Hutton, September 19, 11pSouth AfricaDe Beers Company overview, Economics
DS200612-0199
2006
Robert-Charrue, C.Burkhard, M., Caritg, S., Helg, U., Robert-Charrue, C., Soulainmani, A.Tectonics of the Anti-Atlas of Morocco.Comptes Rendus Geoscience, Vol. 338, 1-2, pp. 11-24.Africa, MoroccoTectonics
DS201112-0777
2010
Roberto de Gois, J.Perdoncini, L.C., Soares, P.C., Roberto de Gois, J.Excursao de acmpo: Geologia e ocxorencias diamantiferas da regiao de Tibagi.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, Guidebook pp. 92-101.South America, Brazil, ParanaGuidebook area - Tibagi
DS2002-0659
2002
RobertsHart, C.J.R., McCoy, D.T., Goldfarb, Smith, RobertsGeology, exploration and discovery in the Tintin a gold province Alaska and YukonSociety of Economic Geologists Special Publication, No.9,pp.241-74.Yukon, AlaskaGold, Deposit - Tintina area
DS2002-1456
2002
RobertsShearer, S., Bankey, Hill, Finn, Daniels, Snyder, RobertsUnited States aeromagnetic database: a companion to the North American magnetic anomaly map.Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 387.United States, CanadaMap - magnetic
DS1991-1434
1991
Roberts, A.M.Roberts, A.M., Yielding, G., Freeman, B.The geometry of normal faultsGeological Society of London Special Publication, No. 56, 275pBaltic States, North Sea, Alps, Germany, Greece, EgyptStructure, fault, geophysics, seismics, Tectonics
DS1991-1435
1991
Roberts, A.M.Roberts, A.M., Yielding, G., Freeman, B.Geometry of normal faultsGeological Society of London Special Publ, No. 56, 264p. ISBN 0-903317-59-1 $ 110.25 United StatesBookEurope, Structure -normal faults
DS200412-1074
2004
Roberts, A.M.Kusznir, N.J., Hunsdale, R., Roberts, A.M.Timing of depth dependent lithosphere stretching on the S. LOfoten rifted margin offshore mid-Norway: pre-breakup or post-breakuBasin Research, Vol. 16, pp. 279-296.Europe, NorwayGeothermometry, extension
DS1995-1984
1995
Roberts, A.P.Verosub, K.L., Roberts, A.P.Environmental magnetism: past, present and futureJournal of Geophysical Research, Vol. 100, No. B2, Feb. 10, pp. 2175-2192GlobalMagnetism -environmental, Review
DS201112-0802
2011
Roberts, A.P.Piper, J.D.A., Jiasheng, Z., Huang, B., Roberts, A.P.Paleomagnetism of Precambrian dyke swarms in the North Chin a shield: the ~1.8 Ga LIP event and crustal consolidation in late Paleoproterozoic times.Journal of Asian Earth Sciences, Vol. 41, 6, pp. 504-524.ChinaPangea supercontinent
DS1950-0040
1950
Roberts, B.Roberts, B.Kimberley (1950)Unknown, South AfricaHistory, Kimberley
DS1960-1201
1969
Roberts, B.Roberts, B.Cecil Rhodes and the PrincessThe Literary Guild, London, 405pSouth AfricaBiography
DS1970-0590
1972
Roberts, B.Roberts, B.The Diamond MagnatesNew York: Scribner., 335P.South AfricaKimberley, Janlib, Biography
DS1984-0223
1984
Roberts, B.Deans, T., Roberts, B.Carbonatite Tuffs and Lava Clasts of the Tinderet Foothills, Western Kenya: a Study of Calcified Natrocarbonatites.Geological Society of London Journal, Vol. 141, PP. 563-580.Central Africa, KenyaRelated Rocks, Petrography
DS1986-0142
1986
Roberts, B.Clarke, M.G., Roberts, B.Carbonated melilitites and calcitized alkali carbonatites fromHonaMountain, Western Kenya: a reinterpretationGeological Magazine, Vol.123, No. 6, November pp. 683-692KenyaAfrica, Carbonatite
DS1987-0141
1987
Roberts, B.Dawson, J.B., Garson, M.S., Roberts, B.Altered former alkalic carbonatite lava from Oloinyo Lengai,Tanzania:inferences for calcite carbonatite lavasGeology, Vol. 15, No. 8, August, pp. 765-768TanzaniaAlkaline rocks, Geochemistry
DS1988-0575
1988
Roberts, B.Roberts, B.Cecil Rhodes-flawed ColorssusLondon, Thorold Pty. Ltd, 56.00R.South AfricaHistory, Biography
DS1988-0711
1988
Roberts, B.Turner, D.C., Bailey, D.K., Roberts, B.Volcanic carbonatites of the Kaluwe complex, Zambia, and discussionJournal of Geology Society of London, Vol. 145, pt. 1, January pp. 95-106ZambiaCarbonatite
DS1997-0764
1997
Roberts, B.Menzel-Jones, A., Ferguson, I.J., Grant, N., Roberts, B.Deep Slave: probing the deep lithosphere beneath the Slave Craton and adjacent terranes using electromagnetic imaging.Geological Survey of Canada Forum 1997 abstracts, p. 4. AbstractNorthwest TerritoriesCraton, Geophysics - electromagnetic
DS1998-1242
1998
Roberts, B.Roberts, B., Snyder, D.Upper crustal structures in the Slave Craton near Yellowknife - results from SNORCLE LINE 1.Yellowknife Geoscience Forum Nov. 25-27, p. 94-5. abstractNorthwest TerritoriesCraton, Tectonics
DS200712-0066
2005
Roberts, B.Bellefleur, G., Matthews, L., Roberts,B., McMonnies, B., Salisbury, M., Snyder, D., Perron, G., McGaughty, J.Downhole seismic imaging of the Victor kimberlite, James Bay Lowlands, Ontario: a feasibility study.Geological Survey of Canada Current Research, 2005- C1, 7p.Canada, OntarioGeophysics - seismics
DS1990-1235
1990
Roberts, B.L.Roberts, B.L.A computer model of the Lake Wisconsi nan cordilleran ice sheetPh.d. thesis, Kent State University, 280pWisconsinGeomorphology, Computers
DS1997-0213
1997
Roberts, B.R.Cook, F.A., Van der Velden, A.J., Hall, K.W., Roberts, B.R.Upper mantle reflectors beneath the SNORCLE transect - images of the base of the lithosphere.Lithoprobe Slave/SNORCLE., pp. 58-62.MantleGeophysics - seismics
DS1998-0270
1998
Roberts, B.R.Cook, F.A., Van der Velden, A.J., Hall, K.W., Roberts, B.R.Tectonic delamination and subcrustal imbrication of the Precambrian lithosphere in northwestern Canada...Geology, Vol. 26, No. 9, Sept. pp. 839-42.Northwest TerritoriesLithoprobe - Slave Province, Geophysics - seismics
DS1998-1243
1998
Roberts, C.Roberts, C.Botswana: Africa's secret success storyAfrican Access Magazine, 3rd. Quarter pp. 29-37.BotswanaEconomics, Diamonds
DS1989-1281
1989
Roberts, D.Roberts, D.The terrane concept and the Scandinavian Caledonides: a synthesisNor. Geol. Unders, Bulletin. No. 413, pp. 93-99ScandinaviaTectonics, Terranes
DS1995-0917
1995
Roberts, D.Karpuz, R., Roberts, D., Moralev, V.M., Terekhov, E.Regional lineaments of eastern Finnmark, Norway and the western KolaPeninsula, Russia.Ngu Report, No. 7, pp. 121-135.Russia, Kola PeninsulaTectonics, Regional - not specific to diamonds
DS1997-0957
1997
Roberts, D.Roberts, D., Olesen, O., Karpuz, M.R.Seismo- and neotectonics in Finnmark, Kola Peninsula and the southern Barents Sea: geological framework...Tectonophysics, Vol. 270, No. 1, 2, Feb. 28, pp. 1-14.Finland, Kola PeninsulaTectonics, Geophysics - seismics
DS2002-0493
2002
Roberts, D.Gabirelsen, R.H., Braathen, A., Dehls, J., Roberts, D.Tectonic lineaments of NorwayNorsk Geologisk Tidsskrift, Vol. 82, No. 3, pp. 153-174.NorwayTectonics
DS200712-0123
2007
Roberts, D.Burke, K., Roberts, D., Ashwal, L.D.Alkaline rocks and carbonatites of northwestern Russia and northern Norway: linked Wilson cycle records over two billion years.Tectonics, Vol. 26, 4, TC4015.RussiaCarbonatite
DS200712-0124
2007
Roberts, D.Burke, K., Roberts, D., Ashwal, L.D.Alkaline rocks and carbonatites of northwestern Russia and northern Norway: linked Wilson cycle records extending over two billion years.Tectonics, Vol. 26, pp. TC4015 10p.Europe, Russia, NorwayCarbonatite
DS1989-1199
1989
Roberts, D.E.Perring, C.S., Rock, N.M.S., Golding, S.D., Roberts, D.E.Criteria for the recognition of metamorphosed or altered lamprophyres: acase study from the Archean of Kambalda Western AustraliaPrecambrian Research, Vol. 43, nol 2, pp. 215-237AustraliaCanada, Zimbabwe, Tanzania, Classification -Lamprophy, Geochemistry
DS1994-1467
1994
Roberts, G.Roberts, G.Redaurum Limited Investment reviewHambros Equities United Kingdom Limited, August 5, 10p.ZimbabweNews item -research report, Redaurum Limited
DS201112-0415
2011
Roberts, G.G.Hartley, R.A., Roberts, G.G., White, N., Ricgardson, C.Transient convective uplift of an ancient buried landscale.Nature Geoscience, in press availableMantle, Europe, ScotlandConvection
DS201212-0587
2012
Roberts, G.G.Roberts, G.G., White, N.J., Martin-Brandis, G.L., Crosby, A.G.An uplift history of the Colorado Plateau and its surroundings from the inverse modeling of longitudinal river profiles.Tectonics, Vol. 31, TC4022 26p.United States, CanadaGeomorphology
DS201412-0666
2014
Roberts, G.G.Paul, J.D., Roberts, G.G., White, N.The African Lands cape through space and time. ( since 50 Ma)Tectonics, Vol. 33, 6, pp. 898-935..AfricaRiver profiles, topography
DS201810-2373
2018
Roberts, G.G.Roberts, G.G., White, N., Hoggard, M.J., Ball, P.W., Meenan, C.A Neogene history of mantle convective support beneath Borneo.Earth and Planetary Science Letters, Vol. 496, 1, pp. 142-158.Asia, Borneoconvection

Abstract: Most, but not all, geodynamic models predict 1-2 km of mantle convective draw-down of the Earth's surface in a region centered on Borneo within southeast Asia. Nevertheless, there is geomorphic, geologic and geophysical evidence which suggests that convective uplift might have played some role in sculpting Bornean physiography. For example, a long wavelength free-air gravity anomaly of +60 mGal centered on Borneo coincides with the distribution of Neogene basaltic magmatism and with the locus of sub-plate slow shear wave velocity anomalies. Global positioning system measurements, an estimate of elastic thickness, and crustal isostatic considerations suggest that regional shortening does not entirely account for kilometer-scale regional elevation. Here, we explore the possible evolution of the Bornean landscape by extracting and modeling an inventory of 90 longitudinal river profiles. Misfit between observed and calculated river profiles is minimized by smoothly varying uplift rate as a function of space and time. Erosional parameters are chosen by assuming that regional uplift post-dates Eocene deposition of marine carbonate rocks. The robustness of this calibration is tested against independent geologic observations such as thermochronometric measurements, offshore sedimentary flux calculations, and the history of volcanism. A calculated cumulative uplift history suggests that kilometer-scale Bornean topography grew rapidly during Neogene times. This suggestion is corroborated by an offshore Miocene transition from carbonate to clastic deposition. Co-location of regional uplift and slow shear wave velocity anomalies immediately beneath the lithospheric plate implies that regional uplift could have been at least partly generated and maintained by temperature anomalies within an asthenospheric channel.
DS201412-0150
2013
Roberts, G.P.Cowie, P.A., Scholz, C.H., Roberts, G.P., Faure Walker, J.P., Steer, P.Viscous roots of active seismogenic faults revealed by geologic slip rate variations.Nature Geoscience, Vol. 6, 12, pp. 1036-1040.Europe, ItalyDuctile crust
DS2002-1347
2002
Roberts, H.Roberts, H., Dahl. P., Kelley, S., Frei, R.New 207 Pb 206 Pb and 40 Ar 39 Ar ages from SW Montana: constraints on the Proterozoic and Archean tectonic and depositional history of the Wyoming Province.Tectonophysics, Vol.352,1-2,July, pp. 119-143.MontanaGeochronology
DS1981-0349
1981
Roberts, J.Roberts, J.The Glittering Prize. This Is the Richest Diamond Mine in The World. It's Australian, But the South Africans are Seeking Control.The Age (melbourne), APRIL 22ND. P. 1. (2P.).Australia, Western AustraliaArgyle, Dispute, Cso, Markets
DS1981-0350
1981
Roberts, J.Roberts, J.Argyle May Be Even Richer... the Ak 1 PipeThe Age (melbourne), AUGUST 27TH.Australia, Western AustraliaSampling, Cross Section, Pipe
DS1982-0264
1982
Roberts, J.Hausel, W.D., Albert, K., Brink, C., Roberts, J.Report on Investigations Related to Prospecting for Diamond bearing Kimberlite and Related Placer Deposits in Wyoming.Wyoming Geological Survey Open File Report, No. 82-1, 48P.United States, Wyoming, State Line, Rocky Mountains, Green River BasinGeochemistry, Prospecting
DS2003-1173
2003
Roberts, J.Roberts, J.Masters of illusion: how De Beers cons the world into paying such high prices for itsThe Ecologist, Vol. 33, No. 7, pp. 34-39.BotswanaNews item - legal
DS200412-1676
2003
Roberts, J.Roberts, J.Glitter & Greed: the secret world of the diamond cartel. Publ. The Disinformation Co. New York.Gems & Gemology, Vol. 40, 1, Spring, p.93 abstract.GlobalNews item - not well researched
DS200412-1677
2003
Roberts, J.Roberts, J.Masters of illusion: how De Beers cons the world into paying such high prices for its cheap, plentiful diamonds, whilst turningThe Ecologist, Vol. 33, no. 7, pp. 34-39.Africa, BotswanaNews item - legal
DS201901-0056
2018
Roberts, J.Pommier, A., Roberts, J.Understanding electrical signals from below Earth's surface. SIGMELTS ( peridotite San Carlos)Geochimica et Cosmochimica Acta, Vol. 242, pp. 165-190.United States, Arizonaperidotite

Abstract: Scientists have known for a long time that various types of rock conduct current differently and that these differences are even more pronounced as the temperatures and pressures increase farther beneath Earth’s surface. They also know that unusual changes in electrical conductivity can signal activity down below, like migrating magma or a release of trapped fluids. Thus, electrical measurements can uncover clues about the events that trigger earthquakes and volcanic eruptions here on the surface. They can also give clues to the mantle’s structure and dynamics. However, interpreting these signals is far from straightforward. Earth scientists increasingly use electrical observations made in the field to image Earth’s crust and mantle, in particular, at subduction zones and mid-ocean ridges. An effective means of interpreting these electrical images and placing them into context with other geological observations is key to translating raw data into usable knowledge. Such knowledge includes assessing potential hazards by investigating, for example, links between fluid release and earthquake generation or the production and transport of magmatic melt from its source region to an eventual eruption. SIGMELTS is a freely available app that helps to characterize electrically conductive or resistive features detected at depth using electromagnetic observations. The objective of this Web application is to facilitate the elaboration of models of the electrical properties of crust and mantle materials, which, in turn, is used to improve the interpretation of field electromagnetic observations. A new version of SIGMELTS is now available.
DS200712-1245
2007
Roberts, J.H.Zhong, S., Zhang, N., Xiang Li, Z., Roberts, J.H.Supercontinent cycles, true polar wander, and very long wavelength mantle convection.Earth and Planetary Science Letters, Vol. 261, 3-4, pp. 551-564.MantleConvection
DS1990-1485
1990
Roberts, J.J.Tyburczy, J.A., Roberts, J.J.Low frequency electrical response of polycrystalline olivine compacts:grain boundary transportGeophysical Research Letters, Vol. 17, No. 11, October pp. 1985-1988New MexicoGeophysics, Olivine
DS1994-1468
1994
Roberts, J.J.Roberts, J.J., Tyburcy, J.A.Frequency dependent electrical properties of minerals and partial meltsSurveys in Geophysics, Vol. 15, No. 2, March pp. 239-262GlobalGeophysics, Mineralogy
DS1999-0603
1999
Roberts, J.J.Roberts, J.J., Tyburczy, J.A.Partial melt electrical conductivity: influence of melt compositionJournal of Geophysical Research, Vol. 104, No. 4, Apr. 10, pp. 7055-66.MantleMelt, Geophysics
DS1920-0310
1926
Roberts, J.K.Weller, S., Roberts, J.K., Mayfield, S.M.Map of the Areal and Structural Geology and Fault Patterns Of Livingston County.Kentucky Geological Survey Map, L:L MILE.Central StatesKimberlite
DS1920-0192
1924
Roberts, J.R.Roberts, J.R.Jurassic Intrusives of Piedmont, VirginiaPan-american Geologist., Vol. 39, No. 4, PP. 289-296.Appalachia, VirginiaGeology
DS1984-0347
1984
Roberts, J.T.Hausel, W.D., Roberts, J.T.Economic Geology of the Colorado Wyoming Kimberlite ProvinceAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) MEETING, RAPID CITY, SOUTH DAKOTA., PREPRINT 25P. SEPT. 13TH.United States, Colorado, Wyoming, State Line, Rocky Mountains, OregonGeology, Prospecting, Geochemistry, Testing, Grease Table
DS1985-0274
1985
Roberts, J.T.Hausel, W.D., Mccallum, M.E., Roberts, J.T.The Geology, Diamond Testing Procedures, and Economic Potential of the Colorado Wyoming Kimberlite Province- a Review.Wyoming Geological Survey Report Inv., No. 31, 23P.United States, State Line, Colorado, WyomingHistory, Geology, Location, Diamond Occurrences, Prospecting
DS200512-0081
2005
Roberts, K.Bethune, S., Amakali, M., Roberts, K.Review of Namibian legislation and policies pertinent to environmental flows.Physics and Chemistry of the Earth Parts A,B,C, in pressAfrica, NamibiaLegal, geomorphology, water requirements, ecosystems
DS201708-1747
2017
Roberts, M.Roberts, M.Varied emplacement mechanisms with adjacent kimberlite vents, Jwaneng mine, Botswana11th. International Kimberlite Conference, OralAfrica, BotswanaDeposit - Jwaneng
DS1980-0290
1980
Roberts, M.A.Roberts, M.A., Skall, H., Pighin, D.L.Diatremes in the Rocky Mountains of Southeastern British Columbia.The Canadian Mining and Metallurgical Bulletin (CIM Bulletin) ., Vol. 73, No. 821, PP. 74-75. (abstract.).Canada, British ColumbiaDiatreme
DS201609-1740
2010
Roberts, M.A.Roberts, M.A.The Jwaneng resource extension project - defining the resource, shaping the future.The 4th Colloquium on Diamonds - source to use held Gabarone March 1-3, 2010, 10p.Africa, BotswanaDeposit - Jwaneng

Abstract: Debswana's Jwaneng Mine (south-central Botswana) is the richest diamond mine• in the world and has been contributing substantial revenue to Botswana since the mine started operating in 1982. The resource consists of 3 separate volcanic pipes/vents namely North, South and Centre pipes (2 additional small kimberlite bodies have also been intersected within the mining pit) which erupted through Transvaal strata and the overlying Karoo sediments - 245 million years ago. Although earlier drilling and geophysical surveys suggest that the 3 pipes extend to depths greater than 1 km below the surface, the resource is only at an indicated level of confidence to a depth of 400m, and mining activities will start exploiting the inferred resource material below 400m in 2014.
DS1994-1469
1994
Roberts, M.C.Roberts, M.C.Business cycles and forecasts of industrial minerals useNonrenewable Resources, Vol. 3, No. 4, Winter pp. 315-324United StatesEconomics, Industrial minerals
DS201012-0145
2009
Roberts, M.J.De Wit, M.C.J., Ward, J.D., Bamford, M.K., Roberts, M.J.The significance of the Cretaceous Diamondiferous gravel deposit at Mahura Mthla Northern Cape province, South Africa.South African Journal of Geology, Vol. 112, 2, pp. 89-108.Africa, South AfricaAlluvials
DS201704-0634
2017
Roberts, M.P.Korhonen, F.J., Johnson, S.P., Wingate, M.T.D., Fletcher, I.R., Dunkley, D.J., Roberts, M.P., Sheppard, S., Muhling, J.R., Rasmussen, B.Radiogenic heating and craton-margin plate stresses as drivers for intraplate orogeny.Journal of Metamorphic Geology, in press availableMantleCraton

Abstract: The Proterozoic belts that occur along the margins of the West Australian Craton, as well as those in intraplate settings, generally share similar geological histories that suggest a common plate-margin driver for orogeny. However, the thermal drivers for intraplate orogenesis are generally more poorly understood. The Mutherbukin Tectonic Event records a protracted period of Mesoproterozoic reworking of the Capricorn Orogen and offers significant insight into both the tectonic drivers and heat sources of long-lived intraplate orogens. Mineral assemblages and tectonic fabrics related to this event occur within a 50 km-wide fault-bound corridor in the central part of the Gascoyne Province in Western Australia. This zone preserves a crustal profile, with greenschist facies rocks in the north grading to upper amphibolite facies rocks in the south. The P- T-t evolution of 13 samples from 10 localities across the Mutherbukin Zone is investigated using phase equilibria modelling integrated with in situ U-Pb monazite and zircon geochronology. Garnet chemistry from selected samples is used to further refine the P-T history and shows that the dominant events recorded in this zone are prolonged D1 transpression between c. 1320 and 1270 Ma, followed by D2 transtension from c. 1210 to 1170 Ma. Peak metamorphic conditions in the mid-crust reached >650 °C and 4.4-7 kbar at c. 1210-1200 Ma. Most samples record a single clockwise P-T evolution during this event, although some samples might have experienced multiple perturbations. The heat source for metamorphism was primarily conductive heating of radiogenic mid- and upper crust, derived from earlier crustal differentiation events. This crust was thickened during D1 transpression, although the thermal effects persisted longer than the deformation event. Peak metamorphism was terminated by D2 transtension at c. 1210 Ma, with subsequent cooling driven by thinning of the radiogenic crust. The coincidence of a sedimentary basin acting as a thermal lid and a highly radiogenic mid-crustal batholith restricted to the Mutherbukin Zone accounts for reworking being confined to a discrete crustal corridor. Our results show that radiogenic regions in the shallow to mid crust can elevate the thermal gradient and localize deformation, causing the crust to be more responsive to far-field stresses. The Mutherbukin Tectonic Event in the Capricorn Orogen was synchronous with numerous Mesoproterozoic events around the West Australian Craton, suggesting that thick cratonic roots play an important role in propagating stresses generated at distant plate boundaries.
DS201709-2019
2017
Roberts, M.P.Kohonen, F.J., Johnson, S.P., Wingate, M.T.D., Kirkland, C.L., Fletcher, I.R., Dunkley, D.J., Roberts, M.P., Sheppard, S., Muhling, J.R., Rasmussen, B.Radiogenic heating and craton margin plate stresses as drivers for intraplate orogeny.Journal of Metamorphic Geology, Vol. 35, 6, pp. 631-661.Mantlegeothermometry

Abstract: The Proterozoic belts that occur along the margins of the West Australian Craton, as well as those in intraplate settings, generally share similar geological histories that suggest a common plate-margin driver for orogeny. However, the thermal drivers for intraplate orogenesis are more poorly understood. The Mutherbukin Tectonic Event records a protracted period of Mesoproterozoic reworking of the Capricorn Orogen and offers significant insight into both the tectonic drivers and heat sources of long-lived intraplate orogens. Mineral assemblages and tectonic fabrics related to this event occur within a 50 km-wide fault-bound corridor in the central part of the Gascoyne Province in Western Australia. This zone preserves a crustal profile, with greenschist facies rocks in the north grading to upper amphibolite facies rocks in the south. The P–T–t evolution of 13 samples from 10 localities across the Mutherbukin Zone is investigated using phase equilibria modelling integrated with in situ U–Pb monazite and zircon geochronology. Garnet chemistry from selected samples is used to further refine the P–T history and shows that the dominant events recorded in this zone are prolonged D1 transpression between c. 1,320 and 1,270 Ma, followed by D2 transtension from c. 1,210 to 1,170 Ma. Peak metamorphic conditions in the mid-crust reached >650°C and 4.4–7 kbar at c. 1,210–1,200 Ma. Most samples record a single clockwise P–T evolution during this event, although some samples might have experienced multiple perturbations. The heat source for metamorphism was primarily conductive heating of radiogenic mid- and upper crust, derived from earlier crustal differentiation events. This crust was thickened during D1 transpression, although the thermal effects persisted longer than the deformation event. Peak metamorphism was terminated by D2 transtension at c. 1,210 Ma, with subsequent cooling driven by thinning of the radiogenic crust. The coincidence of a sedimentary basin acting as a thermal lid and a highly radiogenic mid-crustal batholith restricted to the Mutherbukin Zone accounts for reworking being confined to a discrete crustal corridor. Our results show that radiogenic regions in the shallow to mid crust can elevate the thermal gradient and localize deformation, causing the crust to be more responsive to far-field stresses. The Mutherbukin Tectonic Event in the Capricorn Orogen was synchronous with numerous Mesoproterozoic events around the West Australian Craton, suggesting that thick cratonic roots play an important role in propagating stresses generated at distant plate boundaries.
DS1997-1289
1997
Roberts, N..Zaleski, E., Eaton, D.W., Milkereit, B., Roberts, N..Seismic reflections from subvertical diabase dikes in an Archean terraneGeology, Vol. 25, No. 8, August pp. 707-710OntarioSuperior Province, Manitouwadge greenstone belt, Geophysics - seismics
DS201112-0870
2011
Roberts, N.M.W.Roberts, N.M.W.Continental growth spurts during supercontinent break-up.Goldschmidt Conference 2011, abstract p.1735.MantleSubduction
DS201212-0588
2012
Roberts, N.M.W.Roberts, N.M.W.Increased loss of continental crust during supercontinent amalgamation.Gondwana Research, Vol. 21, 4, pp. 994-1000.GlobalSupercontinents
DS201312-0747
2013
Roberts, N.M.W.Roberts, N.M.W.The boring billion? Lid tectonics, continental growth and environmental change associated with the Columbia supercontinent.Geoscience Frontiers, Vol. 4, 6, pp. 681-691.MantleColumbia
DS201412-0875
2014
Roberts, N.M.W.Spencer, C.J., Cawood, P.A., Hawkesowrth, C.J., Raub, T.D., Prave, A.R., Roberts, N.M.W.Proterozoic onset of crustal reworking and collisional tectonics: reappraisal of the zircon oxygen isotope record.Geology, in press availableMantleTectonics
DS201503-0171
2015
Roberts, N.M.W.Roberts, N.M.W., Spencer, C.J.The zircon archives of continent formation through time.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 197-225.MantleGeochronology
DS201503-0172
2015
Roberts, N.M.W.Roberts, N.M.W., Van Kranendonk, J., Parman, S., Clift, P.D.Continent formation through time.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 1-16.GlobalGeotectonics
DS201604-0636
2016
Roberts, N.M.W.Thomas, R.J, Spencer, C., Bushi, A.M., Baglow, N., Gerrit de Kock, B., Hortswood, M.S.A., Hollick, L., Jacobs, J., Kajara, S., Kaminhanda, G., Key, R.M., Magana, Z., McCourt, M.W., Momburi, P., Moses, F., Mruma, A., Myamilwa, Y., Roberts, N.M.W., HamisiGeochronology of the centra Tanzania craton and its southern and eastern orogenic margins.Precambrian Research, in press available 57p.Africa, TanzaniaGeochronology

Abstract: Geological mapping and zircon U-Pb/Hf isotope data from 35 samples from the central Tanzania Craton and surrounding orogenic belts to the south and east allow a revised model of Precambrian crustal evolution of this part of East Africa. The geochronology of two studied segments of the craton shows them to be essentially the same, suggesting that they form a contiguous crustal section dominated by granitoid plutons. The oldest orthogneisses are dated at ca. 2820 Ma (Dodoma Suite) and the youngest alkaline syenite plutons at ca. 2610 Ma (Singida Suite). Plutonism was interrupted by a period of deposition of volcano-sedimentary rocks metamorphosed to greenschist facies, directly dated by a pyroclastic metavolcanic rock which gave an age of ca. 2725 Ma. This is supported by detrital zircons from psammitic metasedimentary rocks, which indicate a maximum depositional age of ca. 2740 Ma, with additional detrital sources 2820 and 2940 Ma. Thus, 200 Ma of episodic magmatism in this part of the Tanzania Craton was punctuated by a period of uplift, exhumation, erosion and clastic sedimentation/volcanism, followed by burial and renewed granitic to syenitic magmatism. In eastern Tanzania (Handeni block), in the heart of the East African Orogen, all the dated orthogneisses and charnockites (apart from those of the overthrust Neoproterozoic granulite nappes), have Neoarchaean protolith ages within a narrow range between 2710 and 2630 Ma, identical to (but more restricted than) the ages of the Singida Suite. They show evidence of Ediacaran "Pan-African" isotopic disturbance, but this is poorly defined. In contrast, granulite samples from the Wami Complex nappe were dated at ca. 605 and ca. 675 Ma, coeval with previous dates of the "Eastern Granulites" of eastern Tanzania and granulite nappes of adjacent NE Mozambique. To the south of the Tanzania Craton, samples of orthogneiss from the northern part of the Lupa area were dated at ca. 2730 Ma and clearly belong to the Tanzania Craton. However, granitoid samples from the southern part of the Lupa "block" have Palaeoproterozoic (Ubendian) intrusive ages of ca. 1920 Ma. Outcrops further south, at the northern tip of Lake Malawi, mark the SE continuation of the Ubendian belt, albeit with slightly younger ages of igneous rocks (ca. 1870-1900 Ma) which provide a link with the Ponte Messuli Complex, along strike to the SE in northern Mozambique. In SW Tanzania, rocks from the Mgazini area gave Ubendian protolith ages of ca. 1980-1800 Ma, but these rocks underwent Late Mesoproterozoic high-grade metamorphism between 1015 and 1040 Ma. One granitoid gave a crystallisation age of ca. 1080 Ma correlating with known Mesoproterozoic crust to the east in SE Tanzania and NE Mozambique. However, while the crust in the Mgazini area was clearly one of original Ubendian age, reworked and intruded by granitoids at ca. 1 Ga, the crust of SE Tanzania is a mixed Mesoproterozoic terrane and a continuation from NE Mozambique. Hence the Mgazini area lies at the edge of the Ubendian belt which was re-worked during the Mesoproterozoic orogen (South Irumide belt), providing a further constraint on the distribution of ca. 1 Ga crust in SE Africa. Hf data from near-concordant analyses of detrital zircons from a sample from the Tanzania Craton lie along a Pb-loss trajectory (Lu/Hf = 0), extending back to ~3.9 Ga. This probably represents the initial depleted mantle extraction event of the cratonic core. Furthermore, the Hf data from all igneous samples, regardless of age, from the entire study area (including the Neoproterozoic granulite nappes) show a shallow evolution trend (Lu/Hf = 0.028) extending back to the same mantle extraction age. This implies the entire Tanzanian crust sampled in this study represents over 3.5 billion years of crustal reworking from a single crustal reservoir and that the innermost core of the Tanzanian Craton that was subsequently reworked was composed of a very depleted, mafic source with a very high Lu/Hf ratio. Our study helps to define the architecture of the Tanzanian Craton and its evolution from a single age-source in the early Eoarchaean.
DS201710-2267
2017
Roberts, N.M.W.Spencer, C.J., Roberts, N.M.W., Santosh, M.Growth, destruction, and preservation of Earth's continental crust.Earth-Science Reviews, Vol. 172, pp. 87-106.Mantlegeodynamics

Abstract: From the scant Hadean records of the Jack Hills to Cenozoic supervolcanoes, the continental crust provides a synoptic view deep into Earth history. However, the information is fragmented, as large volumes of continental crust have been recycled back into the mantle by a variety of processes. The preserved crustal record is the balance between the volume of crust generated by magmatic processes and the volume destroyed through return to the mantle by tectonic erosion and lower crustal delamination. At present-day, the Earth has reached near-equilibrium between the amount of crust being generated and that being returned to the mantle at subduction zones. However, multiple lines of evidence support secular change in crustal processes through time, including magma compositions, mantle temperatures, and metamorphic gradients. Though a variety of isotopic proxies are used to estimate crustal growth through time, none of those currently utilized are able to quantify the volumes of crust recycled back into the mantle. This implies the estimates of preserved continental crust and growth curves derived therefrom represent only a minimum of total crustal growth. We posit that from the Neoarchean, the probable onset of modern-day style plate tectonics (i.e. steep subduction), there has been no net crustal growth (and perhaps even a net loss) of the continental crust. Deciphering changes from this equilibrium state through geologic time remains a continual pursuit of crustal evolution studies.
DS201810-2318
2018
Roberts, N.M.W.Gardiner, N.J., Searle, M.P., Morley, C.K., Robb, L.J., Whitehouse, M.J., Roberts, N.M.W., Kirkland, C.L., Spencer, C.J.The crustal architecture of Myanmar imaged through zircon U-Pb, Lu-Hf and O isotopes: tectonic and metallogenic implications. ReviewGondwana Research, Vol. 62, pp. 27-60.Asia, Myanmartectonics

Abstract: The Tethys margin in central and eastern Asia is comprised of continental terranes separated by suture zones, some of which remain cryptic. Determining the crustal architecture, and therefore the geological history, of the Eastern Tethyan margin remains challenging. Sited in the heart of this region, Myanmar is a highly prospective but poorly explored minerals jurisdiction. A better understanding of Myanmar's mineralization can only be realized through a better understanding of its tectonic history, itself reflected in at least four major magmatic belts. The Eastern and the Main Range Provinces are associated with the Late Permian to Early Triassic closure of Palaeo-Tethys. The Mogok-Mandalay-Mergui Belt and Wuntho-Popa Arc are a response to the Eocene closure of Neo-Tethys. However, magmatic ages outside these two orogenic events are also recorded. We present new zircon U-Pb, Lu-Hf and O isotope data from magmatic rocks across Myanmar, which we append to the existing dataset to isotopically characterize Myanmar's magmatic belts. Eastern Province Permian I-type magmatism has evolved eHf (-10.9 to -6.4), whilst Main Range Province Triassic S-type magmatism also records evolved eHf (-13.5 to -8.8). The Mogok-Mandalay-Mergui Belt is here divided into the Tin Province and the Mogok Metamorphic Belt. The Tin Province hosts ca. 77-50 Ma magmatism with evolved eHf (-1.2 to -15.2), and d 18 O of 5.6-8.3‰. The Mogok Metamorphic Belt exhibits a more complex magmatic and metamorphic history, and granitoids record Jurassic, Late Cretaceous, and Eocene to Miocene phases of magmatism, all of which exhibit evolved eHf values between -4.6 and -17.6, and d 18 O between 6.3 and 9.2‰. From the Tagaung-Myitkyina Belt, we report a magmatic age of 172 Ma and eHf of 18.1 to 10.8. To accommodate the geological evidence, we propose a tectonic model for Myanmar involving a greater Sibumasu - where the documented zircon isotopic variations reflect compositional variations in magmatic source - and invoke the role of a Tengchong Block. The Baoshan Block and Greater Sibumasu were likely assembled on or before the Triassic, a former Andean margin and suture which may lie across the Northern Shan Plateau, and reflected in isotopic differences between the northern and southern parts of the Mogok Metamorphic Belt. This contiguous Sibumasu-Baoshan Block then sutured onto the Indochina margin in the Late Triassic. We propose that a Tengchong Block within Myanmar provides for a southerly termination of the Meso-Tethys suture immediately north of the Mogok area. A discrete Tengchong Block may explain a discontinuous arc of Late Triassic to Jurassic I-type magmatism in central Myanmar, representing an Andean-type margin sited above a subducting Meso-Tethys on the margin of Sibumasu. The Tengchong Block sutured onto Greater Sibumasu before the Late Cretaceous, after which subduction of Neo-Tethys drove the magmatism of the Wuntho-Popa Arc and ultimately that of the Tin Province. The metallogenic character of granite belts in Myanmar reflects the crustal architecture of the region, which is remarkable for its prolific endowment of granite-hosted Sn-W mineralization in two quite distinct granite belts related to sequential Indosinian and Himalayan orogenesis.
DS201908-1807
2013
Roberts, N.M.W.Roberts, N.M.W.The boring billion? Lid tectonics, continental growth and environmental change associated with the Colombia supercontinent. NOTE Date** 2013Geoscience Frontiers, Researchgate pp. 1-11. pdfMantletectonics

Abstract: The evolution of Earth's biosphere, atmosphere and hydrosphere is tied to the formation of continental crust and its subsequent movements on tectonic plates. The supercontinent cycle posits that the continental crust is periodically amalgamated into a single landmass, subsequently breaking up and dispersing into various continental fragments. Columbia is possibly the first true supercontinent, it amalgamated during the 2.0-1.7 Ga period, and collisional orogenesis resulting from its formation peaked at 1.95-1.85 Ga. Geological and palaeomagnetic evidence indicate that Columbia remained as a quasi-integral continental lid until at least 1.3 Ga. Numerous break-up attempts are evidenced by dyke swarms with a large temporal and spatial range; however, palaeomagnetic and geologic evidence suggest these attempts remained unsuccessful. Rather than dispersing into continental fragments, the Columbia supercontinent underwent only minor modifications to form the next supercontinent (Rodinia) at 1.1-0.9 Ga; these included the transformation of external accretionary belts into the internal Grenville and equivalent collisional belts. Although Columbia provides evidence for a form of ‘lid tectonics’, modern style plate tectonics occurred on its periphery in the form of accretionary orogens. The detrital zircon and preserved geological record are compatible with an increase in the volume of continental crust during Columbia's lifespan; this is a consequence of the continuous accretionary processes along its margins. The quiescence in plate tectonic movements during Columbia's lifespan is correlative with a long period of stability in Earth's atmospheric and oceanic chemistry. Increased variability starting at 1.3 Ga in the environmental record coincides with the transformation of Columbia to Rodinia; thus, the link between plate tectonics and environmental change is strengthened with this interpretation of supercontinent history.
DS201909-2021
2019
Roberts, N.M.W.Beard, C.D., Goodenough, K.M., Broom-Findlay, S., Borst, A.M., Roberts, N.M.W., Finch, A.A., Deady, E.A.Subducted sediments as a source of REE in mineralized post - collisional alkaline carbonatite systems.Goldschmidt2019, 1p. AbstractChinasubduction

Abstract: Many of the world's largest known REE deposits are associated with post-collisional alkaline-carbonatite magmatic complexes (e.g., the Minanning-Dechang belt, China). These systems are potassic to ultrapotassic in composition and contain LREE-dominated mineralisation associated with F and Ba-rich carbonatite breccias, carbonatite dykes and carbo-hydrothermal veins. They are typically emplaced through major shear zones during a period of 'relaxation' that postdates continental collision by up to 75 Ma. The subduction of sediment during continental collision is potentially a key control on the 'fertility' of the mantle source, and understanding the role of sediment is a crucial step towards better exploration models. However, the identification of sediment source components to alkaline systems has not been straightforward because their petrological complexity precludes traditional methods such as trace-element ratios and major-element modelling of crystal fractionation. We use a global database of Sr, Nd and Hf isotope compositions for alkaline and carbonatite systems, alongside geodynamic reconstructions to identify favourable source components for mineralisation and to provide direct information about the origin of the metals of interest. Subduction of shale and carbonate sequences is likely to introduce REE + HFSE and potentially mineralising ligands (F-, CO3 2-) into the mantle source for post-collisional alkaline systems; clastic sediments are poorer in these vital components. This research provides a framework through which the mineral exploration industry can identify tectonic environments that are predisposed to form REE mineralisation, providing regional-scale (100-1000 km) guidance especially for systems hidden beneath sedimentary cover.
DS200512-0838
2004
Roberts, P.A.Penny, S.R., Allen, R.M., Harrison, S., Lees, T.C., Murphy, F.C., Norman, A.R., Roberts, P.A.A global scale exploration risk analysis technique to determine the best mineral belts for exploration.Transactions of Institute of Mining and Metallurgy, Vol. 113, September pp. 183-194.Economics - risk analysis
DS1991-0062
1991
Roberts, P.D.Ball, T.K., Cameron, D.G., Colman, T.B., Roberts, P.D.Behaviour of radon in the geological environment: a reviewUnknown, Vol. pp. 169-182GlobalRadon, Environment
DS1989-1282
1989
Roberts, R.Roberts, R.Mineral sands : New production peaks a spur to explorationRegister of Australian Mining 1989/90, pp. 288-296, pp. 367-368. Database # 18226AustraliaRare earths, Mineral sands
DS1989-0509
1989
Roberts, R.G.Gibson, I.L., Roberts, R.G., Gibbs, A.An extensional fault model for the early development of greenstone belts- areplyEarth and Planetary Science Letters, Vol. 92, No. 1, February pp. 127-128OntarioGreenstone belt, Tectonics
DS200612-1289
2006
Roberts, R.G.Shomali, Z.H., Roberts, R.G., Pedersen, L.B., TORLithospheric structure of the Tornquist Zone resolved by nonlinear P and S teleseismic tomography along the TOR array.Tectonophysics, Vol. 416, 1-4, April 5, pp. 133-149.Europe, Baltic ShieldGeophysics - seismics
DS200712-0788
2007
Roberts, R.G.Olsson, S., Roberts, R.G., Boovarsson, R.Analysis of waves converted from S to P in the upper mantle beneath the Baltic Shield.Earth and Planetary Science Letters, Vol. 257, 1-2, May 15, pp. 37-46.Europe, Norway, Sweden, Finland, Kola PeninsulaGeophysics - seismics
DS200812-0323
2008
Roberts, R.J.Eriksson, P.G., Banerjee, S., Nelson, D.R., Rigby, M.J., Catuneanu, O., Sarkar, S., Roberts, R.J., Ruban, Mtimkulu, RajuA Kaapvaal Craton debate: nucleus of an early small supercontinent or affected by an enhanced accretion event?Gondwana Research, In press available, 82p.Africa, South AfricaSupercontinents
DS200912-0204
2009
Roberts, R.J.Eriksson, P.G., Banerjee, S., Nelson, D.R., Rigby, M.J., Catuneau, O., Sarar, S., Roberts, R.J., Ruban, D., Mtimkulu, M.N., Sunder Raju, P.V.A Kaapvaal craton debate: nucleus of an early small supercontinent or affected by an enhanced accretion event?Gondwana Research, Vol. 15, 3-4, pp. 354-372.Africa, South AfricaAccretion
DS1986-0141
1986
Roberts, S.Christiansen, F.G., Roberts, S.Formation of olivine pseudo crescumulates by sytectonic axial planar growth during mantle deformationGeology Magazine, Vol. 123, No. 1, pp. 73-79OmanMantle
DS1989-1283
1989
Roberts, S.Roberts, S.Wyoming geomapsWyoming Geological Survey, Educational series No. 1, reproduction of mapsGlobalWyoming, Maps
DS1990-1236
1990
Roberts, S.Roberts, S.Geologic field tours of western Wyoming and parts of adjacent Idaho, Montana and UtahGeological Survey of Wyoming, Circular No. 29WyomingStructure, Owl Creek Mountains
DS1990-1237
1990
Roberts, W.L.Roberts, W.L., Campbell, T.J., Rapp, G.R. Jr.Encyclopedia of minerals ( second edition)Van Nostrand, 979p. approx. $ 140.00GlobalMineralogy, Book review
DS1910-0305
1912
Roberts Victor DiamondsRoberts Victor DiamondsConsulting Engineer's Report on Current Year's Activities And Production.South African Mining Journal 21ST. ANNIVERSARY VOLUME., Vol. 21A, P. 455.South AfricaCurrent Activities
DS1997-0259
1997
Roberts..De Meijer, R.J., Stapel, C., Jones, D.G., Roberts..Improved and new uses of natural radiactivity n mineral exploration andprocessingExploration and Mining Geology, Vol. 6, No. 1, pp. 105-117GlobalCoast - sediments, heavy minerals, Technology - radioactivity
DS1992-0935
1992
Robertshaw, P.Lehnert-Thiel, Loewer, R., Orr, R.G., Robertshaw, P.Diamond bearing kimberlites in Saskatchewan, Canada: the Fort a la Corne case historyThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Exploration Mining Geology, Vol. 1, No. 4, October pp. 391-403SaskatchewanGeology, history, Deposit- Fort a la Corne area
DS1994-1561
1994
Robertshaw, P.Scott Smith, Orr, R.G., Robertshaw, P., Avery, R.W.Geology of the Fort a la Corne kimberlites, Saskatchewan #1The Canadian Institute of Mining, Metallurgy and Petroleum (CIM), pp. 19-24.SaskatchewanDetailed geology, Deposit -Fort a la corne
DS1995-1690
1995
Robertshaw, P.Scott Smith, B.H., Orr, R.G., Robertshaw, P., Avery, R.W.Geology of the Fort a la Corne kimberlites, Saskatchewan #2Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 543-545.SaskatchewanGeology, crater, age, rock types, Deposit -Fort a la Corne
DS1998-0692
1998
Robertshaw, P.Jellicoe, B.C., Robertshaw, P., Williamson, P. Murphy.Summary of exploration activities and results for the Fort a la Corne diamond project.Saskatchewan Report of Activities, miscellaneous Report, No. 98-4, pp. 144-57.SaskatchewanExploration - brief overview
DS1998-0693
1998
Robertshaw, P.Jellicoe, B.C., Robertshaw, P., Williamson, P., MurphySummary of exploration activities and results for Fort a la Corne diamond project, Saskatchewan.Saskatchewan Geological Survey Summary 1998, pp.SaskatchewanExploration
DS1998-1305
1998
Robertshaw, P.Scott Smith, B.H., Orr, R.G., Robertshaw, P., Avery, R.Geology of the Fort a la Corne kimberlites, Saskatchewan #37th. Kimberlite Conference abstract, pp. 772-4.SaskatchewanClassification, Deposit - Fort a la Corne, crater, age, rock types
DS2002-0773
2002
Robertshaw, P.Jellicoe, B.C., Robertshaw, P., Williamson, P., Murphy, J.Exploration activities and results for the Fort a la Corne diamond projects, Saskatchewan.Canadian Institute of Mining and Metallurgy, Vol. 53, Industrial Minerals of Canada, pp. 327-44.SaskatchewanHistory - exploration
DS2000-0445
2000
RobertsonJellicoe, B.C., Robertson, Billingsley, KjarsgaardSummary of investigation: the diamond potential of Saskatchewan, 2000. a study in progress.Saskatchewan Mineral Report, No. 2000, 4-2, pp. 223-5.SaskatchewanGeology - brief overview
DS2003-1204
2003
RobertsonSader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M., RobertsonGroundwater interaction with kimberlites - a geochemical investigation in northeasternExplore ( AEG Newsletter), No. 118, January pp. 1-4.Ontario, Kirkland LakeGeochemistry, Analytical methods and results
DS2003-1205
2003
RobertsonSader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M., RobertsonField procedures and results of groundwater sampling in kimberlite from drillholes in theGeological Survey of Canada Current Research, 9p.Ontario, Kirkland LakeSampling - geomorphology
DS2003-1206
2003
RobertsonSader, J.A., Leybourne, M.L., McClenaghan, M.B., Hamilton, S.M., RobertsonKimberlite exploration using aqueous geochemistry - a new exploration methodGeological Association of Canada Annual Meeting, Abstract onlyGlobalTechniues - geochemistry
DS1994-0111
1994
Robertson, A.D.Barron, B.J., Robertson, A.D., Sutherland, F.L.Olivine leucitites, their xenoliths and megacrystic suites, Hoskings north Queensland.Geological Society of Australia Abstracts, No. 37, pp. 16, 17.Australia, QueenslandXenoliths, leucite
DS1994-1470
1994
Robertson, A.D.Robertson, A.D., Robertson, C.M.The Brigooda diamond enigmaQueensland Government Mining Journal, October pp. 32-33.Australia, QueenslandBlank
DS200412-1678
1994
Robertson, A.D.Robertson, A.D., Robertson, C.M.The Brigooda diamond enigma.Queensland Government Mining Journal, October pp. 32-33.Australia, QueenslandMobile zone, lamproite magma
DS1992-1282
1992
Robertson, A.D.C.Robertson, A.D.C.Possible origins and ages for saphhire and diamond from the central Queensland gem fields.Records of the Australian Museum, Supplement, Vol. 15, October 16, pp. 45-54.Australia, QueenslandDiamonds
DS1996-1195
1996
Robertson, A.H.F.Robertson, A.H.F., Dixon, J.E.The geology of the eastern MediterraneanGeological Society of London, No. 17 revised 832p. approx. $ 98.00 United StatesGlobalGeology and evolution -Mediterranean, Book -ad
DS201012-0630
2010
Robertson, C.Robertson, C., Roeland, L.Using a girl's best friend to grow a multi million dollar aboriginal corporation Tlicho Investment Corporation.38th. Geoscience Forum Northwest Territories, Abstract pp.80-81.Canada, Northwest TerritoriesTlicho
DS1985-0147
1985
Robertson, C.H.Devries, R.C., Robertson, C.H.The Microstructure of Ballas (crystalline Diamond) by Electrostatic Charging in the Scanning Electron Microscope (sem).Journal of MATERIAL SCIENCE LETTERS, Vol. 4, No. 6, JUNE PP. 805-807.GlobalBlank
DS1994-1470
1994
Robertson, C.M.Robertson, A.D., Robertson, C.M.The Brigooda diamond enigmaQueensland Government Mining Journal, October pp. 32-33.Australia, QueenslandBlank
DS200412-1678
1994
Robertson, C.M.Robertson, A.D., Robertson, C.M.The Brigooda diamond enigma.Queensland Government Mining Journal, October pp. 32-33.Australia, QueenslandMobile zone, lamproite magma
DS201605-0811
2016
Robertson, E.Biggs, J., Robertson, E., Cashman, K.The lateral extent of volcanic interactions during unrest and eruption. Nature Geoscience, Vol. 9, pp. 308-311.MantleMagmatism

Abstract: Volcanic eruptions often occur simultaneously1, 2, 3, 4 or tap multiple magma reservoirs5, 6. Such lateral interactions between magmatic systems are attributed to stress changes7, 8 or hydraulic connections4, 8, 9, 10 but the precise conditions under which coupled eruptions occur have yet to be quantified. Here we use interferometric synthetic aperture radar satellite data to analyse the surface deformation generated by volcanic unrest in the Kenyan Rift. We identify several magma sources located at depths of 2-5?km; importantly, sources that are spaced less than about 10?km apart interact, whereas those spaced more than about 25?km apart do not. However, volcanoes up to 25?km apart have interacted in the geologic past1, 11. Thus, volcanic coupling is not simply controlled by the distance between the magma reservoirs. We then consider different tectonic settings globally, including intraplate volcanoes such as Hawaii and Yellowstone, arc volcanism in Alaska and Chile, and other rift settings, such as New Zealand, Iceland and Afar. We find that the most closely spaced magmatic interactions are controlled by the extent of a shallow crystal mush layer, stress changes can couple large eruptions over distances of about 20-40?km, and only large dyke intrusions or subduction earthquakes could generate coupled eruptions over distances of about 50-100?km.
DS1991-1436
1991
Robertson, H.Robertson, H.Origin of interactive computer graphics in seismologyThe Leading Edge, June pp. 55-58GlobalGeophysics -seismics, History
DS1996-1196
1996
Robertson, I.D.M.Robertson, I.D.M.Ferruginous lag geochemistry: practical aspects and limitationExplore, No. 92, July pp. 4-8AustraliaSaprolites, laterites, Geochemistry
DS1993-0385
1993
Robertson, J.D.Dyar, M.D., Mackwell, S.J., Cross, L.R., Robertson, J.D.Crystal chemistry of iron and Hydrogen in mantle kaersutite: implications for mantle MetasomatismAmerican Mineralogist, Vol. 78, No. 9, 10, September-October pp. 968-979MantleMetasomatism, iron, Hydrogen, Geochemistry
DS1980-0069
1980
Robertson, J.K.Boettcher, A.L., Robertson, J.K., Wyllie, P.J.Studies in Synthetic Carbonatite Systems: Solidus Relationships for Cao Mgo Co2 H2o to 40 Kbar and Cao Mgo Sio2 Cos H2oto 10 Kbar.Journal of Geophysical Research, Vol. 85, No. B 12, DECEMBER 10TH. PP. 6937-6943.GlobalMineralogy
DS200412-1718
2003
Robertson, K.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M., Robertson, K.Field procedures and results of groundwater sampling in kimberlite from drillholes in the Kirkland Lake and Lake Temiskaming areGeological Survey of Canada Current Research, 9p.Canada, Ontario, Kirkland LakeSampling - geomorphology
DS200412-1719
2003
Robertson, K.Sader, J.A., Leybourne, M.L., McClenaghan, M.B., Hamilton, S.M., Robertson, K.Kimberlite exploration using aqueous geochemistry - a new exploration method.Geological Association of Canada Annual Meeting, Abstract onlyTechnologyTechniues - geochemistry
DS201612-2330
2016
Robertson, K.Robertson, K., Heinson, G., Thiel, S.Lithospheric reworking at the Proterozoic-Phanerozoic transition of Australia imaged using AuLAMP magnetotelluric data.Earth and Planetary Science Letters, Vol. 452, pp. 27-35.AustraliaGeophysics - magnetoctelluric
DS2003-0360
2003
Robertson, L.Dyke, A.S., Moore, A., Robertson, L.Deglaciation of North AmericaGeological Survey of Canada Open File, No. 1574, 1 CD, $ 26.00Canada, United StatesGeomorphology
DS200412-0494
2003
Robertson, L.Dyke, A.S., Moore, A., Robertson, L.Deglaciation of North America.Geological Survey of Canada Open File, No. 1574, 1 CD, $ 26.00Canada, United StatesGeomorphology
DS200612-0353
2006
Robertson, L.Dredge, L.A., Robertson, L.Ice flow and recessional ice margin indicators, central Baffin Island, Nunavut.Geological Survey of Canada, No. 5341, 1 CD $ 9.10Canada, NunavutGeomorphology
DS1970-0396
1971
Robertson, M.Robertson, M.The Centennary of KimberleyJohannesburg: International Diamond Annual, PP. 27-31.South AfricaHistory
DS1970-0981
1974
Robertson, M.Robertson, M.Diamond Fever 1866-1869Cape Town: Oxford University Press, 250P.South AfricaKimberley, Janlib, Diamond
DS201412-0740
2014
Robertson, M.Robertson, M.Cathodluminescence instrumentation.GAC/MAC short Course, MayTechnologyCathodluminescence
DS1997-0958
1997
Robertson, R.Robertson, R., et al.Recent developments in dense medium cyclone circuit design.... specific tocoalSociety for Mining, Metallurgy and Exploration (SME) Preprint, No. 97-153, 6pGlobalCoal, Mineral processing
DS1960-0661
1966
Robertson, R.H.S.Fairbairn, P.E., Robertson, R.H.S.Stages in the Tropical Weathering of KimberliteClay Minerals, Vol. 6, PP. 351-370.South AfricaGeomorphology
DS1975-0898
1978
Robertson, R.R.Yarger, H.L., Robertson, R.R., Wentland, R.L.The Midcontinent Geophysical AnomalyKansas Academy of Science Transactions, Vol. 81, P. 184. (abstract.).GlobalMid-continent
DS1999-0604
1999
Robertson, S.Robertson, S.Classification of metamorphic rocksBritish Geological Survey, No. 99-02, 24p.GlobalClassification - metamorphic rocks
DS200412-1679
1999
Robertson, S.Robertson, S.Classification of metamorphic rocks.British Geological Survey, No. 99-02, 24p.TechnologyClassification - metamorphic rocks
DS1985-0124
1985
Robertson, S.H.Collins, A.T., Robertson, S.H.Catholuminescence Studies of Sintered DiamondJournal of MATERIALS SCIENCE LETTERS, Vol. 4, No. 6, JUNE PP. 681-684.GlobalBlank
DS1960-0124
1961
Robertson, W.A.Boeson, R., Irving, E., Robertson, W.A.The Paleomagnetism of Some Igneous Rock Bodies in New Southwales.Royal Society. NEW SOUTH WALES Transactions, Vol. 94, PP. 224-232.AustraliaKimberlite, Non Kimberlitic Breccia Pipes
DS1975-1201
1979
Robertson, W.A.Robertson, W.A.Paleomagnetic Results from Some Sydney Basin Igneous Rock Deposits.Journal and Proceedings of the Royal Society of New South Wales, Vol. 112, PP. 31-35.AustraliaKimberlite, Non-kimberlitic Breccia Pipes, Paleomagnetism
DS1980-0291
1980
Robertson research (aust.) pty. ltd., SUTTONS MOTORS HOLDINGS.Robertson research (aust.) pty. ltd., SUTTONS MOTORS HOLDINGS.El 1357 Annual Report for Year Ending 8/8/80Northern Territory Geological Survey Open File Report, No. CR 80/223, 16P.Australia, Northern TerritoryDiamond Prospecting
DS1994-1471
1994
Robertson-Rintoul, M.S.E.Robertson-Rintoul, M.S.E., Richards, K.S.Braided channel pattern and palaeohydrology using an index of totalsinuosity.Best, and Bristow, Braided Rivers Geological Society of London, No. 75, pp. 113-118.GlobalGeomorphology, Braided -channel pattern
DS1982-0521
1982
Robey, J.Robey, J.Mantle and Lower Crustal Xenoliths from Kimberlites of the Central Cape province, R.s.a.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, PP. 235-236, (abstract.).South AfricaKimberlite
DS1988-0275
1988
Robey, J.Grutter, H.S., Robey, J.Lower crustal xenoliths and garnets from Cape Province kimberlitesGeoBulletin, Vol. 31, No. 1, p. 34South AfricaBlank
DS2003-0864
2003
Robey, J.Mahotkin, I.L., Robey, J., Kurszlaukis, S., Valuev, E.P., Pylaev, N.F.Pipe emplacement model of the Lomonosov diamond deposit, Arkangelsk region, NW8 Ikc Www.venuewest.com/8ikc/program.htm, Session 1, AbstractRussiaGeology, economics, Deposit - Lomonosov
DS200412-1203
2003
Robey, J.Mahotkin, I.L., Robey, J., Kurszlaukis, S., Valuev, E.P., Pylaev, N.F.Pipe emplacement model of the Lomonosov diamond deposit, Arkangelsk region, NW Russia.8 IKC Program, Session 1, AbstractRussiaGeology, economics Deposit - Lomonosov
DS200612-0526
2006
Robey, J.Hanson, E.K., Moore, J.M., Robey, J., Bordy, E.M., Marsh, J.S.Re-estimation of erosion levels in Group I and II kimberlites between Lesotho, Kimberley and Victoria West, South Africa.Emplacement Workshop held September, 5p. extended abstractAfrica, South Africa, LesothoCrustal xenoliths
DS200812-0347
2008
Robey, J.Field, M., Stefenhofer, J., Robey, J., Kurzlaukis, S.Kimberlite hosted diamond deposits of southern Africa: A review.Ore Geology Reviews, Vol. 34, pp. 33-75.Africa, South Africa, BotswanaReview
DS200812-0901
2008
Robey, J.Pittari, A., Cas, R.A.F., Lefebvre, N., Robey, J., Kurszlaukis, S., Webb, K.Eruption processes and facies architecture of the Orion Central kimberlite volcanic complex, Fort a la Corne: kimberlite mass flow deposits in a sedimentary basin.Journal of Volcanology and Geothermal Research, Vol. 174, 1-3, pp. 152-170.Canada, SaskatchewanMegaturbidite, sedimentary basins, diatremes
DS201707-1334
2017
Robey, J.Hatton, C., Robey, J.The eminent eight. IKC and history of conference and the prominent delegates ( ones who initiated the idea and followed through attending all 10 conferences to date).Geobulletin, Vol. 60, 1, March pp. 19-23.GlobalIKC history
DS201710-2261
2017
Robey, J.Robey, J.First Gems: Kimberley and surrounds, South Africa. Big Hole, Finsch, Koffiefontein, Kareevlei11th International Kimberlite Field Trip Guide, Sept. 62p. PdfAfrica, South Africadeposit - Kimberley, Finsch, Koffiefontein, Kareevlei
DS1981-0351
1981
Robey, J.A.Robey, J.A.Kimberlites of the Central Cape Province, R.s.aPh.d. Thesis, University Cape Town., 261P.South Africa, BotswanaXenoliths, Petrography
DS1998-1297
1998
Robey, J.A.Schmitz, M.D., Bowring, S.A., Robey, J.A.Constraining the thermal history of an Archean craton: uranium-lead (U-Pb)thermochronology of lower crustal xenoliths...7th. Kimberlite Conference abstract, pp. 766-8.South AfricaCraton - Kaapvaal, Geochronology, geothermometry
DS1998-1582
1998
Robey, J.A.Williams, C.M., Robey, J.A., Abson, J.P.Petrography and mineral chemistry of the Mwenezi - 01 kimberlite, Zimbabwe.7th International Kimberlite Conference Abstract, pp. 955-7.ZimbabwePetrography, geothermometry, Deposit - Mwenezi-01
DS200612-0314
2006
Robey, J.A.Davies, G.R., Morel, M.L.A., Wiggers de Vries, D.F., Robey, J.A.Origin of Diamondiferous spinel harzburgite.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 1. abstract only.Africa, South AfricaMineral chemistry
DS1991-1876
1991
Robey, J.V.Williamson, P.A., da Silva, N.B., Vallee, P., Robey, J.V.The Moana-Tinguins melilitite province, Piaui state, northweasternProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 460-462BrazilTectonics, Mineral chemistry
DS201212-0629
2012
Robey, J.V.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Mitchell, R.H., Hetman, C.M., Harder, M., Skinner, E.M.W., Robey, J.V.Kimberlite terminology and classification: geology and emplacement.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractGlobalClassification - kimberlites
DS1986-0672
1986
Robey, J.V.A.Robey, J.V.A., Bristowm J.W., Marxm M.R., Joyce, J., Danchin, R.V.Alkalic ultrabasic dykes of the southeast Yilgarn margin,WesternAustraliaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 142-144AustraliaBlank
DS1989-1284
1989
Robey, J.V.A.Robey, J.V.A., Bristow, J.W., Marx, M.R., Joyce, J., Danchin, R.V.Alkaline ultrabasic dikes near Norseman, western AustraliaGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 382-391AustraliaGeochronology, Lamprophyre
DS1999-0796
1999
Robey, J.V.A.Williams, C.M., Robey, J.V.A.Petrography and mineral chemistry of the Mwenezi-01 kimberlite, Zimbabwe7th International Kimberlite Conference Nixon, Vol. 2, pp. 886-903.ZimbabweGeochemistry, Limpopo Mineral Belt, Deposit - Mwenezi-01
DS201012-0266
2009
Robey, J.V.A.Hanson, E.K., Moore, J.M., Bordy, E.M., Marsh, J.S., Howarth, G., Robey, J.V.A.Cretaceous erosion in central South Africa: evidence from upper crustal xenoliths in kimberlite diatremes.South African Journal of Geology, Vol. 112, 2, pp. 125-140.Africa, South AfricaGeomorphology
DS201312-0797
2013
Robey, Jv.A.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Mitchell, R.H., Hetman, C.M., Harder, M., Skinner, E.M.W., Robey, Jv.A.Kimberlite terminology and classification.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, Special Issue of the Journal of the Geological Society of India,, Vol. 2, pp. 1-17.TechnologyTerminology
DS201412-0790
2013
Robey, Jv.A.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Mitchell, R.H., Hetman, C.M., Harder, M., Skinner, E.M.W., Robey, Jv.A.Kimberlite terminology and classification.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 1-18.Classification
DS1997-0959
1997
Robichaud, R.J.Robichaud, R.J.Tapping into U.S. financial marketsInsight Press, Canada, United StatesEconomics, Financing
DS2003-0354
2003
Robie, D.Dubrovinsky, L., Dubrovinskaia, N., Langenhorst, F., Dobson, D., Robie, D.Iron silica interaction at extreme conditions and the electrically conducting layer at theNature, No. 6927, March 6, pp. 58-60.MantleCore mantle boundary, Geochemistry
DS1990-1226
1990
Robie, R.A.Richet, P., Robie, R.A., Hemingway, B.S., Beuville, D., Richard, G.Thermodynamic and melting properties of pyrope (Mg3Al2Si3O12)Terra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 93AlpsMantle, Pyrope
DS1991-1708
1991
Robie, R.A.Tequil, C., Robie, R.A., Hemingway, B.S., Neuville, D.R., Richet, P.Melting and thermodynamic properties of pyrope (MgsAl2Si3O12)Geochim. et Cosmochimica Acta, Vol. 55, pp. 1005-1010GlobalMineralogy -experimental, Pyrope
DS1997-0960
1997
Robillard, C.Robillard, C.The use of ground penetrating radar in exploration for alluvial diamonddeposits.Exploration 97, Proceedings, pp. 567-572.. Poster abstractBrazilGeophysics - radar, Alluvials, placers
DS1992-1283
1992
Robillard, I.Robillard, I., Francis, D., Ludden, J.N.The relationship between E and N type magmas in the Baffin Bay lavasContribution to Mineralogy and Petrology, Vol. 112, pp. 230-241.GlobalPicrite, Crustal contamination
DS1997-0961
1997
Robin, C.Robin, C., Hall, M., Jiminez, M et al.MojAnd a volcanic comple: development of two adjacent contemporaneous volcanoes with contrasting eruptive ..Journal of South American Earth Sci, Vol. 10, No. 5-6, pp. 345-59EcuadorMagma suites, Geodynamics, geochemistry, volcanics
DS201412-0068
2014
Robin, C.Braun, J., Guillocheau, F., Robin, C., Baby, Guillaume, JelsmaRapid erosion of the southern African plateau as it climbs over a mantle superswell.Journal of Geophysical Research,, Vol. 119, 7, pp. 6093-6112.Africa, southern AfricaGeomorphology
DS201801-0020
2018
Robin, C.Guillocheau, F., Simon, B., Baby, G., Bessin, P., Robin, C., Dauteuil, O.Planation surfaces as a record of mantle dynamics: the case of Africa.Gondwana Research, Vol. 53, 1, pp. 82-98.Africageodynamics

Abstract: There are two types of emerged relief on the Earth: high elevation areas (mountain belts and rift shoulders) in active tectonic settings and low elevation domains (anorogenic plateaus and plains) characteristic of the interior of the continents i.e. 70% of the Earth emerged relief. Both plateaus and plains are characterized by large erosional surfaces, called planation surfaces that display undulations with middle (several tens of kilometres) to very long (several thousands of kilometres) wavelengths, i.e. characteristic of lithospheric and mantle deformations respectively. Our objective is here (1) to present a new method of characterization of the very long and long wavelength deformations using planation surfaces with an application to Central Africa and (2) to reconstruct the growth of the very long wavelength relief since 40 Ma, as a record of past mantle dynamics below Central Africa. (i) The African relief results from two major types of planation surfaces, etchplains (weathering surfaces by laterites) and pediplains/pediments. These planation surfaces are stepped along plateaus with different elevations. This stepping of landforms records a local base level fall due to a local tectonic uplift. (ii) Central Africa is an extensive etchplain-type weathering surface - called the African Surface - from the uppermost Cretaceous (70 Ma) to the Middle Eocene (45 Ma) with a paroxysm around the Early Eocene Climatic Optimum. Restoration of this surface in Central Africa suggests very low-elevation planation surfaces adjusted to the Atlantic Ocean and Indian Ocean with a divide located around the present-day eastern branch of the East African Rift. (iii) The present-day topography of Central Africa is younger than 40 -30 Ma and records very long wavelength deformations (1000 -2000 km) with (1) the growth of the Cameroon Dome and East African Dome since 34 Ma, (2) the Angola Mountains since 15 -12 Ma increasing up to Pleistocene times and (3) the uplift of the low-elevation (300 m) Congo Basin since 10 -3 Ma. Some long wavelength deformations (several 100 km) also occurred with (1) the low-elevation Central African Rise since 34 Ma and (2) the Atlantic Bulge since 20 -16 Ma. These very long wavelength deformations record mantle dynamics, with a sharp increase of mantle upwelling around 34 Ma and an increase of the wavelength of the deformation and then of mantle convection around 10 -3 Ma.
DS200912-0633
2009
Robin, C.M.I.Robin, C.M.I., Bailey, R.C.Simultaneous generation of Archean crust and subcratonic roots by vertical tectonics.Geology, Vol. 37, 6, pp. 523-526.MantleCraton, not specific to diamonds
DS201212-0470
2012
Robin, P.Michael, L., Sojem, J., Robin, P.The geology and geochemistry of the Wadagera kimberlite and the characteristics of the underlying subcontinental lithospheric mantle, Dharwar Craton, India10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractIndiaDeposit - Wadagera
DS1990-0159
1990
Robin, P.Y.F.Ball, D.G.A., Robin, P.Y.F.METPET: metamorphic petrology microcomputer programsJournal of Metamorphic Geology, Vol. 8, No. 3, May pp. 251-256GlobalComputer program -METPET., Petrology
DS2003-1174
2003
Robin, R.Robin, R.Faith, hope and celebrity.. why shares in geologist Chuck Fipke's Metalex VenturesCanadian Business, June pp. 35,36, 39.Ontario, AttawapiskatNews item, Metalex Ventures
DS1986-0671
1986
Robineau, B.Ritz, M., Robineau, B.Crustal and upper mantle electrical conductivity structures inWestAfrica: geodynamic implicationsTectonophysics, Vol. 124, pp. 115-126West AfricaTectonics, Structure
DS1990-1238
1990
Robineau, B.Robineau, B., Ritz, M.Geoelectrical signature of the Central Mauritanides deep structure, Mauritania, West AfricaTectonics, Vol. 9, No. 6, December pp. 1649-1662West AfricaTectonics, Geophysics -seismics
DS1994-1300
1994
Robineau, B.Ohnenstetter, D., Moreau, C., Demaiffe, D., Robineau, B.The Los Archipelago nepheline syenite ring structure: a magmatic marker Of the evolution of central Atlantic...#1Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.GlobalAlkaline rocks, Los Archipelago
DS1996-0991
1996
Robineau, B.Moreau, C., Ohnenstetter, D., Demaiffe, D., Robineau, B.The Los Archipelago nepheline syenite ring structure: a magmatic marker Of the evolution of central Atlantic #2Canadian Mineralogist, Vol. 34, pt. 2, April pp. 281-301.GlobalNepheline syenite
DS1970-0397
1971
Robins, B.Robins, B.Syenite Carbonatite Relationships in the Seiland Gabbro Province, Finnmark, Northern Norway.Norges Geol. Unders. Skr., No. 272, PP. 43-58.Norway, ScandinaviaRelated Rocks, Alkaline, Sternoy, Setland, Lillebukt
DS1975-0171
1975
Robins, B.Robins, B.Ultramafic Nodules from Seiland, Northern NorwayLithos, Vol. 8, PP. 15-27.Norway, ScandinaviaUltramafic And Related Rocks
DS1975-1202
1979
Robins, B.Robins, B. , Maher, A.T.Geology and Geochemistry of a Metamorphosed Picrite Ankaramite Dyke Suite from the Seiland Province, Northern Norway.Norske Geol. Tidsskr., Vol. 59, No. 1, PP. 67-9.Norway, ScandinaviaBlank
DS1983-0539
1983
Robins, B.Robins, B., Tysseland, M.The Geology, Geochemistry and Origin of Ultrabasic Fenites Associated with the Pollen Carbonatite, Finnmark, Norway.Chemical Geology, Vol. 40, No. 1-2, PP. 65-95.Scandinavia, NorwayBlank
DS1996-1412
1996
Robins, B.Tegner, C., Robins, B.Picrite sills and crystal melt reactions in the Honningsvag intrusiveSuite, northern NorwayMineralogical Magazine, Vol. 60, No. 1, Feb pp. 53-66NorwayMagma -layered intrusive, Honningsvag
DS1999-0730
1999
Robins, B.Tegner, C., Robins, B., Grundvig, S.Assimilation of crustal xenoliths in a basaltic magma chamber: Strontium and neodymium isotopic constraints... Hasvik...Journal of Petrology, Vol. 40, No. 3, Mar. pp; 363-80.NorwayLayered intrusion - xenoliths, Geochronology
DS2002-0971
2002
Robins, B.Lundgaard, K.L., Robins, B., Tegner, C., Wilson, J.R.Formation of hybrid cumulates: melatroctolites in Intrusion 4 of the Honningsvag intrusive suite,.Lithos, Vol.61,1-2,March, pp.1-119.Norway, northernLayered intrusion
DS1998-1421
1998
Robins, J.Sumner, J., Wilkes, J., Robins, J., Ramsay, R.A geophysical case study of the Ashmore kimberlite cluster, North KimberleyProvince, Western Australia.Australian Society of Exploration Geophysicists (ASEG) International, p. 109. abstractAustraliaGeophysics, Deposit - Ashmore
DS2003-1146
2003
Robins, J.A.Reddicliffe, T.H., Jakimowicz, J., Hell, A.J., Robins, J.A.The geology, mineralogy and near surface chacteristics of the Ashmore and Seppelt8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractAustraliaKimberlite geology and economics, Deposit - Ashmore, Seppelt
DS2001-0072
2001
RobinsonBai, W. Yang, Robinson, Febg, Zhang, Yan, HuStudy of diamonds from chromitites in the Luobusa ophiolite, TibetActa Geologica Sinica, Vol. 75, No. 3, pp. 409-17.China, TibetChromitites - diamond
DS1950-0296
1956
Robinson, A.Robinson, A.How They Cut the Star of ArkansawArkansaw DEMOCRAT (LITTLE ROCK), SUNDAY MAGAZINE., SEPT. 30TH., PP. 1-7, 8, 9.United States, Gulf Coast, Arkansas, PennsylvaniaDiamonds Notable
DS201412-0741
2014
Robinson, A.Robinson, A.Changing places: the shifting producer power play Discussion - questions and answers with Johan Dippenaar about Petra Diamonds.Idex Magazine, No. 286, Feb. pp. 111-115.Africa, South AfricaPetra Diamonds
DS201412-0742
2014
Robinson, A.Robinson, A.Why timing is everything in business…. Russia's Alrosa and Andreev.Idex Magazine, No. 286, Feb. pp. 98-103.RussiaAlrosa
DS201412-0743
2014
Robinson, A.Robinson, A.Musical chairs: diamond producers swap places due to effect of downturn. De Beers and Alrosa.Idex Magazine, No. 286, Feb. pp. 90-94.GlobalDe Beers, Alrosa
DS201412-0744
2014
Robinson, A.Robinson, A.Panama: more than just a canal. Jewellery market, legal Idex Magazine, No. 291, July pp. 36-68.Latin America, PanamaOverview of exchange and country
DS1996-1387
1996
Robinson, A.D.Sutherland, D.G., Robinson, A.D.Characteristics of alluvial diamond deposits of the River Sarabaya, southeastGuinea.Africa Geoscience Review, Vol. 3, No. 2, pp. 317-329.GuineaAlluvial diamonds, Deposit - Sarabaya area
DS1986-0673
1986
Robinson, A.L.Robinson, A.L.Is diamond the new wonder material?Science, Vol. 234, November 28, pp. 1074-1076GlobalEconomics
DS2002-1629
2002
Robinson, B.A.Valentine, G.A., Zhang, D., Robinson, B.A.Modeling complex, nonlinear geological processesAnnual Review of Earth and Planetary Sciences, Vol.30,pp. 35-64.GlobalModels - nonlinear processes
DS2002-1630
2002
Robinson, B.A.Valentine, G.A., Zhang, D., Robinson, B.A.Modeling complex, nonlinear geological processesAnnual Review of Earth and Planetary Sciences, Vol.30,pp. 35-64.GlobalModels - nonlinear processes
DS1987-0613
1987
Robinson, C.J.Robinson, C.J.Essentials for estimating ore reserves in alluvial depositsPacific Rim Congress 87. Australasian Institute of Mining and Metallurgy, pp. 785-788GlobalAlluvial, Placers-sampling
DS1998-1545
1998
Robinson, D.Viljoen, K.S., Phillips, D., Harris, J.W., Robinson, D.Mineral inclusions in diamonds from the Venetia kimberlites, NorthernProvince, South Africa.7th International Kimberlite Conference Abstract, pp. 943-5.South AfricaDiamond morphology - garnet inclusions, Deposit - Venetia
DS1999-0772
1999
Robinson, D.Viljoen, K.S., Phillips, D., Harris, J.W., Robinson, D.Mineral inclusions in diamonds from the Venetia kimberlites, Northern Province, South Africa.7th International Kimberlite Conference Nixon, Vol. 2, pp. 888-95.South AfricaDiamond - inclusions, mineral chemistry, Deposit - Venetia
DS200412-0290
2004
Robinson, D.Cartigny, P., Chinn, I., Viljoen, K.S., Robinson, D.Early Proterozoic ultrahigh pressure metamorphism: evidence from microdiamonds.Science, Vol. 304, 5672, May 7, pp. 853-4.TechnologyMicrodiamonds, UHP
DS1994-1472
1994
Robinson, D.A.Robinson, D.A., Williams, R.B.G.Rock weathering and landform evolutionJohn Wiley and Sons, 519pGlobalWeathering, Book review
DS1970-0591
1972
Robinson, D.N.Robinson, D.N.Meta carbonatite and Carbonatite Dykes at the Premier Mine And Their Relationship with Kimberlite.Anglo American Research Laboratories, UNPUBL. ReportSouth AfricaGeology
DS1970-0592
1972
Robinson, D.N.Robinson, D.N.Meta carbonatite and Carbonatite Dykes at Premier Mine and Their Relationship with Kimberlite.Anglo American Corp., 26P., (UNPUB.)South AfricaKimberley
DS1970-0814
1973
Robinson, D.N.Robinson, D.N.Magnetite Serpentine Calcite Dykes at Premier Mine and Their Relationship to Kimberlite and to Alkalic Carbonate Complexes.1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 279-281.South AfricaGeology, Mineralogy
DS1975-0172
1975
Robinson, D.N.Robinson, D.N.Magnetite Serpentine Calcite Dykes at Premier Mine and Aspects of Their Relationship to Kimberlite and to Carbonatite Of Alkalic Carbonatite Complexes.Physics and Chemistry of the Earth., Vol. 9, PP. 61-70.South AfricaPetrography
DS1975-0851
1978
Robinson, D.N.Robinson, D.N.The Characteristics of Natural Diamond and Their Interpretation.Minerals Sci. Eng., Vol. 10, No. 2, APRIL, PP. 55-72.South AfricaEclogite, Diamond Genesis, Nodules, Crystallography, Inclusions
DS1975-1203
1979
Robinson, D.N.Robinson, D.N.Diamond and Graphite in Eclogite Xenoliths from KimberliteProceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 50-58.South AfricaPetrography
DS1975-1204
1979
Robinson, D.N.Robinson, D.N.Diamond and Graphite in Eclogite Xenolths from KimberliteProceedings of Second International Kimberlite Conference, Vol. 2, PP. 50-58.South Africa, BotswanaDiamond Genesis, Morphology, Orapa, Roberts Victor, Jagersfontein
DS1980-0292
1980
Robinson, D.N.Robinson, D.N.Surface Textures and other Features of DiamondsCape Town: Ph.d. Thesis University Cape Town., TWO VOLUMES, Vol. 1, 221P.; Vol. 2, 161P.South AfricaMorphology, Genesis
DS1982-0219
1982
Robinson, D.N.Garvie, O.G., Robinson, D.N.The mineralogy, structure and mode of formation of kelphite and associated sub-kelphite surfaces on pyropeTerra Cognita, Vol. 2, pp. 229-30.GlobalMineralogy - Alteration, Kimberlites
DS1982-0522
1982
Robinson, D.N.Robinson, D.N., Shee, S.R., Gurney, J.J.Diamond and Graphite Eclogite from OrapaProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 202, (abstract.).BotswanaKimberlite, Mineralogy, Xenoliths
DS1982-0562
1982
Robinson, D.N.Shee, S.R., Gurney, J.J., Robinson, D.N.Two Diamond Bearing Peridotite Xenoliths from the Finsch Kimberlite, South Africa.Contributions to Mineralogy and Petrology, Vol. 81, No. 2, PP. 79-87.South AfricaBlank
DS1984-0190
1984
Robinson, D.N.Clement, C.R., Harris, J.W., Robinson, D.N., Hawthorne, J.B.The de Beers Kimberlite Pipe - a Historic South African Diamond Mine.Geological Society of South Africa, South AfricaHistory, Geology, Mining Recovery, Diamonds
DS1984-0293
1984
Robinson, D.N.Garvie, O.G., Robinson, D.N.The Formation of Kelyphite and Associated Sub-kelyphitic And Sculptured Surfaces on Pyrope from Kimberlite.Proceedings of Third International Kimberlite Conference., Vol. 1, PP. 371-382.South Africa, BotswanaMineral Chemistry, Garnet, Analyses
DS1984-0610
1984
Robinson, D.N.Robinson, D.N., Gurney, J.J., Shee, S.R.Diamond Eclogite and Graphite Eclogite Xenoliths from Orapa, Botswana.Proceedings of Third International Kimberlite Conference., Vol. 2, PP. 10-24.BotswanaChemical Analyses, Inclusions
DS1986-0674
1986
Robinson, D.N.Robinson, D.N., Scott, J.A., Van Niekerk, A., Anderson, V.G.Events reflected in the diamonds of some southern African kimberlitesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 421-423South AfricaDiamond morphology
DS1986-0753
1986
Robinson, D.N.Smith, C.B., Gurney, J.J., Harris, J.W., Robinson, D.N., Shee, S.R.Strontium and neodymium isotopic systematics of diamond bearing eclogite xenoliths and eclogitic inclusions in diamond from southernAfricaProceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 332-334South AfricaEclogite
DS1989-0563
1989
Robinson, D.N.Gurney, J.J., McCandless, T.E., Kirkley, M.B., Robinson, D.N.Some initial observations on polycrystalline diamonds mainly from Orapa:abstractDiamond Workshop, International Geological Congress, July 15-16th. editors, BotswanaAnalyses, Diamond morphology
DS1989-0973
1989
Robinson, D.N.McCandless, T.E., Kirkley, M.B., Robinson, D.N., Gurney, J.J.Some initial observations on polycrystalline diamonds mainly from Orapa:Diamond Workshop, International Geological Congress, July 15-16th. editors, pp. 47-51BotswanaDiamond morphology, Diamond aggregates
DS1989-1285
1989
Robinson, D.N.Robinson, D.N., Scott, J.A., Van Niekerk, A., Anderson, V.G.The sequence of events reflected in the diamonds of some southern AfricankimberlitesGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 990-1000South AfricaDiamond morphology, Diamond characteristics
DS1989-1408
1989
Robinson, D.N.Smith, C.B., Gurney, J.J., Harris, J.W., Robinson, D.N., Shee, S.R.Sm and neodymium isotopic systematics of diamond bearing eclogite xenoliths and eclogitic inclusions in diamond from southern AfricaGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 853-863South AfricaDiamond inclusions, Diamond eclogite
DS1991-0364
1991
Robinson, D.N.Deines, P., Harris, J.W., Robinson, D.N., Gurney, J.J., Shee, S.R.Carbon and isotope oxygen variations in diamond and graphite eclogites fromOrapa, Botswana and the nitrogen content of their diamondsGeochimica et Cosmochimica Acta, Vol. 55, No. 2, February pp. 515-524BotswanaEclogites, Geochronology, isotopes
DS1991-1396
1991
Robinson, D.N.Ramos, Z., Skinner, E.M.W., Bristow, J.W., Robinson, D.N.Kimberlites and the mantle in South AfricaXiii International Gemmological Conference Held South Africa, Stellenbosch, 2p.abstractSouth AfricaMantle, Diamond genesis
DS1991-1802
1991
Robinson, D.N.Viljoen, K.S., Robinson, D.N., Swash, P.M.Diamond and graphite peridotite xenoliths from the Roberts Victor mineProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 440-442South AfricaPetrography, mineral chemistry, Geothermobarometry, diamond morphology
DS1994-1858
1994
Robinson, D.N.Viljoen, K.S., Robinson, D.N., Swash, P.M., Griffin, W.L., OtterDiamond and graphite bearing peridotite xenoliths from the Roberts Victorkimberlite.Proceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 285-303.South AfricaXenoliths, Deposit -Roberts Victor
DS1998-0188
1998
Robinson, D.N.Burgess, R., Phillips, D., Harris, J.W., Robinson, D.N.Antarctic diamonds in south eastern Australia? Hints from 40 Ar-39AR laser probe dating of clinopyroxene..7th International Kimberlite Conference Abstract, pp. 119-121.Australia, AntarcticaAlluvials, Argon, Deposit - Copeton
DS1998-1244
1998
Robinson, D.N.Robinson, D.N., Ferraris, R., Anderson, V.G., ParkerColour, morphological and surface textural characteristics of diamonds in Venetia kimberlites.7th. Kimberlite Conference abstract, pp. 737-40.South AfricaDiamond morphology, Deposit - Venetia
DS1991-1437
1991
Robinson, E.S.Robinson, E.S.Correlation of tidal gravity and heat flow in eastern North AmericaPhysics of the Earth and Planetary Interiors, Vol. 67, No. 3-4, July pp. 231-236United States, CanadaGeophysics -gravity, Heat flow
DS1992-1284
1992
Robinson, G.M.L.Robinson, G.M.L.Implementing cost effective on-site remediation technologies for mineral processing wastesAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, Annual Meeting held Phoenix Arizona Feb. 24-27th. 1992, Preprint No. 92-205, 16pUnited StatesLegal, regulations, Overview -technologies
DS1984-0315
1984
Robinson, G.W.Grice, J.D., Robinson, G.W.Jeffreyite, (ca Na2) (be Al) Si2 (o Oh)7 a New Mineral Species and its Relation to the Melilite Group.Canadian Mineralogist., Vol. 22, PP. 443-446.Canada, QuebecJeffreyite, Melilite Group
DS1970-0398
1971
Robinson, H.R.Robinson, H.R.E.l. 348, Delegate. Report for 17.11.70 to 17.2.71New South Wales Geological Survey Report., GS 1971/065, (UNPUBL.).AustraliaKimberlite, Diamond
DS1975-0394
1976
Robinson, H.R.Robinson, H.R.Diamond Deposits: their Geology, Exploration and EvaluationLondon: Msc. Thesis, Royal School Mines., AustraliaKimberlite
DS1982-0523
1982
Robinson, H.R.Robinson, H.R., Stockdale prospecting ltd.El 827-gawler Ranges, South Australia, Diamond Exploration Relinquishment Report November 1982.South Australia Open File., No. E4836, 4P. 4 MAPS. UNPUBL.Australia, South AustraliaGeochemistry, Stream Sediment Sampling, Grab Sample, Photogeology
DS1982-0583
1982
Robinson, H.R.Stracke, K.J., Robinson, H.R., Arnott, F.W., Danchin, R.V., Sto.El 652 and El 853 Orroroo South Australia Progress Reports from 23rd. september 1981 to 19th. April 1982.South Australia Open File., No. E3891, 22P. UNPUBL.Australia, South AustraliaGeophysics, Geochemistry, Prospecting, Vlf, Stream Sediment Sampling
DS1985-0561
1985
Robinson, I.K.Robinson, I.K.The Structure of Diamond Lattice Iii Surfaces and X-ray DiffractionTransactions American Crystallogr. Assoc, Vol. 21, pp. 23-32GlobalBlank
DS1988-0103
1988
Robinson, J.Cameron, K., Robinson, J., Nimz, G., Niemeyer, S.Complexities of interpreting model ages of mafic granulite xenoliths, MexicoTerra Cognita, Eclogite conference, Vol. 8, No. 3, Summer, p. 270. AbstractMexicoEclogite, Geochronology
DS1996-1197
1996
Robinson, J.Robinson, J.Diamonds: a premium for pinkMineral Industry International., No. April, pp.AustraliaGemstone mining, marketing, pink tender, Diamond -pink
DS1995-1582
1995
Robinson, J.A.C.Robinson, J.A.C.Low degree partial melting of mantle compositions at 15 -30 kbarsEos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 297.MantleMelt
DS1998-1245
1998
Robinson, J.A.C.Robinson, J.A.C., Wood, B.J.The depth of the spinel to garnet transition at the peridotite solidusEarth and Planetary Science Letters, Vol.164, No.1-2, Dec.15, pp.277-84.MantleGeochemistry - garnet
DS1998-1592
1998
Robinson, J.A.C.Wood, B.J., Blundy, J.D., Robinson, J.A.C.Crystal chemical constraints on the partitioning of U series elements during mantle melting.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1664.MantlePetrology - experimental
DS1999-0806
1999
Robinson, J.A.C.Wood, B.J., Blundy, J.D., Robinson, J.A.C.The role of clinopyroxene in generating U series disequilibrium during mantle melting.Geochimica Et Cosmochimica Acta, Vol. 63, No. 10, May 1, pp. 1613-20.MantleMelting - clinopyroxenes
DS1860-0067
1868
Robinson, J.B.Robinson, J.B.Diamonds at the Cape Colony; Orange RiverJournal of Society of Arts, Vol. 16, Nov. 20TH. PP. 854-855.Africa, South Africa, Cape Province, ZimbabweHistory
DS1910-0089
1910
Robinson, J.B.Robinson, J.B.My First DiamondSouth Africa Majority Special Issue., PP. 72-75.South AfricaHistory
DS1992-0202
1992
Robinson, J.V.Cameron, K.L., Robinson, J.V., Niemeyer, S., Nimz, G.J., KuentzContrasting styles of Pre-Cenozoic and Mid-Tertiary crustal evolution inJournal of Geophysical Research, Vol. 97, No. B 12, November 10, pp. 17, 353-17, 376MexicoXenoliths, Crust
DS1920-0398
1928
Robinson, L.C.Robinson, L.C., Hudnall, J.S., Richardson, H.T.Reconnaissance Map of Elliott County, KentuckyKentucky Geological Survey Ser. 6, Appalachia, KentuckyMap, General Geology
DS1960-0490
1964
Robinson, M.Robinson, M., Bergendahl.Missouri Buttes DescribedUnited States Geological Survey (USGS) PROF. PAPER., No. 404, P. 107; P. 113.United States, South Dakota, Central StatesDiatreme
DS200612-1306
2005
Robinson, N.D.Simandl, G.J., Ferbey, T., Levson, V.M., Robinson, N.D., Lane, R., Smith, R., Demchuk, Raudsepp, HickinKimberlite and diamond indicator minerals in northeast British Columbia, Canada - a reconnaissance survey.British Columbia Geological Survey, Geofile 2005-25, 25p.Canada, British ColumbiaGeochemistry, geochronology, Buffalo Head Terrane
DS1997-0720
1997
Robinson, P.Malpas, J., Robinson, P.The origin and evolution of Oceanic lithosphere: introductionGeoscience Canada, Vol. 24, No. 2, pp. 100-107MantleLithosphere - evolution, ophiolites, Oceanic - rates, Pacific, Indian
DS2001-0755
2001
Robinson, P.McEnroe, S.A., Harrison, R.J., Robinson, P., GollaEffect of fine scale microstructures in titanohematite on the acquisition and stability of natural remnant...Journal of Geophysical Research, Vol. 106, No. 12, pp. 30,523-46.SwedenCrustal magnetism
DS2001-0756
2001
Robinson, P.McEnroe, S.A., Robinson, P., Panish, P.T.Aeromagnetic anomalies, magnetic petrology, and rock magnetism of hemo-ilmenite magnetite rich cumulates...Amer. Min., Vol. 86, pp. 1447-68.NorwayGeophysics - magnetics - not specific to diamonds, Sokndal region
DS200412-1269
2004
Robinson, P.McEnroe, S.A., Langenhorst, F., Robinson, P., Bromiley, G.D., Shaw, C.S.J.What is magnetic in the lower crust?Earth and Planetary Science Letters, Vol. 226, 1-2, Sept. 30, pp.175-192.MantleMagnetic anomalies, hematite-ilmenite, Curie isotherm
DS200412-1979
2004
Robinson, P.Terry, M.P., Robinson, P.Geometry of eclogite facies structural features for production and exhumation of ultrahigh pressure and high pressure rocks, WesTectonics, Vol. 23, 2, 10.1029/2002 TC001401Europe, NorwayUHP
DS200512-1260
2005
Robinson, P.Zheng, J., Sun, M., Zhou, M.F., Robinson, P.Trace elemental and PGE geochemical constraints of Mesozoic and Cenozoic peridotitic xenoliths on lithospheric evolution of the North Chin a Craton.Geochimica et Cosmochimica Acta, Vol. 69, 13, pp. 3401-3418.Asia, ChinaXenoliths
DS200812-1322
2008
Robinson, P.Zheng, J.P., Sun, M., Griffin, W.L., Zhou, M.F., Zhao, G.C., Robinson, P., Tang, H.Y., Zhang, Z.H.Age and geochemistry of contrasting peridotite types in the Dabie UHP belt, eastern China: petrogenetic and geodynamic implications.Chemical Geology, Vol. 247, pp. 282-304.ChinaUHP
DS200912-0634
2008
Robinson, P.Robinson, P., Solli, A., Engvik, A., Erambert, M., Bingen, B., Schiellerup, H., Njange, F.Solid solution between potassic obertitie and potassic fluoro magnesio arfvedsonite in a silica rich lamproite from northeast Mozambique.European Journal of Mineralogy, Vol. 20, 6, pp. 1011-1018.Africa, MozambiqueLamproite
DS201212-0099
2012
Robinson, P.Butler, J.P., Jamieson, R.A., Steenkamp, H.M., Robinson, P.Discovery of coesite eclogite from the Nordyane UHP domain, Western Gneiss region, Norway: field relations, metamorphic history and tectonic significance.Journal of Metamorphic Geology, in press availableEurope, NorwayCoesite
DS201312-0337
2013
Robinson, P.Griffin, W.L., Yang, J.S., Robinson, P., Howell, D., Shi, R., O'Reilly, S.Y., Pearson, D.J.Diamonds and super reducing UHP assemblages in ophiolitic mantle, Tibet: where are the eclogites?X International Eclogite Conference, 1p. abstractAsia, TibetDiamond genesis
DS201907-1587
2019
Robinson, P.Yang, J., Robinson, P., Xu, X., Xiong, F., Lian, D.Diamond in oceanic peridotites and chromitites: evidence for deep recycled mantle in the global ophiolite record.Acta Geologica Sinica, Vol. 93, 2, p.42.Europe, Turkey, Albania, Russia, Chinamicrodiamonds

Abstract: Diamonds have been discovered in mantle peridotites and chromitites of six ophiolitic massifs along the 1300 km-long Yarlung-Zangbo suture (Bai et al., 1993; Yang et al., 2014; Xu et al., 2015), and in the Dongqiao and Dingqing mantle peridotites of the Bangong-Nujiang suture in the eastern Tethyan zone (Robinson et al., 2004; Xiong et al., 2018). Recently, in-situ diamond, coesite and other UHP mineral have also been reported in the Nidar ophiolite of the western Yarlung-Zangbo suture (Das et al., 2015, 2017). The above-mentioned diamond-bearing ophiolites represent remnants of the eastern Mesozoic Tethyan oceanic lithosphere. New publications show that diamonds also occur in chromitites in the Pozanti-Karsanti ophiolite of Turkey, and in the Mirdita ophiolite of Albania in the western Tethyan zone (Lian et al., 2017; Xiong et al., 2017; Wu et al., 2018). Similar diamonds and associated minerals have also reported from Paleozoic ophiolitic chromitites of Central Asian Orogenic Belt of China and the Ray-Iz ophiolite in the Polar Urals, Russia (Yang et al., 2015a, b; Tian et al., 2015; Huang et al, 2015). Importantly, in-situ diamonds have been recovered in chromitites of both the Luobusa ophiolite in Tbet and the Ray-Iz ophiolite in Russia (Yang et al., 2014, 2015a). The extensive occurrences of such ultra-high pressure (UHP) minerals in many ophiolites suggest formation by similar geological events in different oceans and orogenic belts of different ages. Compared to diamonds from kimberlites and UHP metamorphic belts, micro-diamonds from ophiolites present a new occurrence of diamond that requires significantly different physical and chemical conditions of formation in Earth's mantle. The forms of chromite and qingsongites (BN) indicate that ophiolitic chromitite may form at depths of >150-380 km or even deeper in the mantle (Yang et al., 2007; Dobrthinetskaya et al., 2009). The very light C isotope composition (d13C -18 to -28‰) of these ophiolitic diamonds and their Mn-bearing mineral inclusions, as well as coesite and clinopyroxene lamallae in chromite grains all indicate recycling of ancient continental or oceanic crustal materials into the deep mantle (>300 km) or down to the mantle transition zone via subduction (Yang et al., 2014, 2015a; Robinson et al., 2015; Moe et al., 2018). These new observations and new data strongly suggest that micro-diamonds and their host podiform chromitite may have formed near the transition zone in the deep mantle, and that they were then transported upward into shallow mantle depths by convection processes. The in-situ occurrence of micro-diamonds has been well-demonstrated by different groups of international researchers, along with other UHP minerals in podiform chromitites and ophiolitic peridotites clearly indicate their deep mantle origin and effectively address questions of possible contamination during sample processing and analytical work. The widespread occurrence of ophiolite-hosted diamonds and associated UHP mineral groups suggests that they may be a common feature of in-situ oceanic mantle. The fundamental scientific question to address here is how and where these micro-diamonds and UHP minerals first crystallized, how they were incorporated into ophiolitic chromitites and peridotites and how they were preserved during transport to the surface. Thus, diamonds and UHP minerals in ophiolites have raised new scientific problems and opened a new window for geologists to study recycling from crust to deep mantle and back to the surface.
DS1990-0746
1990
Robinson, P.T.Ishii, T., Robinson, P.T., Fiske, R.Petrology of ODP LED 125: mantle peridotites And related rocks from serpentine diapiric seamounts in the IZU-Ogasawara-Mariana forearcGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Vancouver 90 Program with Abstracts, Held May 16-18, Vol. 15, p. A63. AbstractOceanMantle, Peridotites
DS1993-0064
1993
Robinson, P.T.Bai, W.J., Robinson, P.T., Zhou, M.Diamond -bearing peridotites from Tibetan ophiolites: implications for a subduction related origin of diamondsMid-continent diamonds Geological Association of Canada (GAC)-Mineralogical Association of Canada (MAC) Symposium ABSTRACT volume, held Edmonton May, pp. 77-84China, TibetOphiolites
DS1993-1708
1993
Robinson, P.T.Wen-Ji Bai, Mei-Fu Zhou, Robinson, P.T.Possible diamond bearing mantle peridotites and podiform chromitites in the Luobusa and Donqiao ophiolites, Tibet.Canadian Journal of Earth Sciences, Vol. 30, No. 8, August pp. 1650-1659.TibetDiamond bearing, Peridotites, ophiolites
DS1994-1993
1994
Robinson, P.T.Zhou, M.F., Robinson, P.T., Bai, W.J.Formation of podiform chromitites by melt/rock interaction in the uppermantle.Mineralium Deposita, Vol. 29, No. 1, pp. 98-101.Mantle, ChinaHarzburgite, Lherzolites
DS1994-1995
1994
Robinson, P.T.Zhou, M-F., Robinson, P.T.High chromium and high Aluminum podiform chromitites western China: relationship to partial melting in upper mantle.International Geology Review, Vol. 36, No. 7, July pp. 678-686.ChinaMantle, Dabie Shan area
DS1998-0645
1998
Robinson, P.T.Hu, Xu-Feng, Robinson, P.T.Mineralogy, of diamond bearing chromitites, Luobusa ophiolite, southernTibet.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A81. abstract.China, TibetOphiolite - Luobusa, Mineralogy
DS1998-0928
1998
Robinson, P.T.Malpos, J., Robinson, P.T.Oceanic lithosphere 2. the origin and evolution: bathymetry and morphology of ocean basinsGeoscience Canada, Vol. 25, No. 3, Sept. pp. 128-138OceansContinental margins, ridges, Lithosphere
DS2000-0609
2000
Robinson, P.T.Malpas, J., Robinson, P.T.No. 4The origin and evolution of oceanic lithosphere: magmatic processes at oceanic spreading centresGeoscience Canada, Vol. 27, No. 3, Sept. pp. 131-46.MantlePlumes, geophysics, magma chambers, ophiolites
DS2000-1035
2000
Robinson, P.T.Xu-Feng, H., Robinson, P.T., Wenji Bai, ZhouDiamonds in ophiolites - fact or fictionGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Calgary May 2000, 3p.China, TibetOphiolite - Luobusa, podiforM.
DS2003-1556
2003
Robinson, P.T.Zhaochong, Z., Jingwen, M., Robinson, P.T., Zhou, M.F., Guochao, Z., JianminThe Aoyougou mafic ultramafic complex in the North Qilian Mountains northwestInternational Geology Review, Vol. 45, 9, pp. 841-856.China, northwestMagmatism
DS200412-2221
2003
Robinson, P.T.Zhaochong, Z., Jingwen, M., Robinson, P.T., Zhou, M.F., Guochao, Z., Jianmin, Y., Zhiliang, W., Zuoheng, Z.The Aoyougou mafic ultramafic complex in the North Qilian Mountains northwest China: a possible middle Proterozoic ophiolite aloInternational Geology Review, Vol. 45, 9, pp. 841-856.ChinaMagmatism
DS200612-0208
2006
Robinson, P.T.Cailai, W., Wooden, J.L., Jingsui, Y., Robinson, P.T., Lingsen, Z., Rendeng, S., Songyong, C.Granitic magmatism in the North Qaidam Early Paleozoic Ultra high pressure metamorphic belt, northwest China.International Geology Review, Vol. 48, 3, pp. 223-240.Asia, ChinaUHP
DS200912-0776
2009
Robinson, P.T.Trumball, R.B., Yang, J-S., Robinson, P.T., Di Pierro, S., Vennemann, T., Wiedenbeck, M.The carbon isotope composition of natural SiC (moissanite) from the Earth's mantle: new discoveries from ophiolites.Lithos, In press - available 31p.MantleMoissanite
DS201112-0871
2004
Robinson, P.T.Robinson, P.T., Bai, W-J., Malpas, J., Yang, J-S., Zhou, M-F., Fang, Q-S., Hu, X-F., Cameron, StaudigelUltra high pressure minerals in the Loubasa ophiolite, Tibet and their tectonic implications.Aspects of the Tectonic evolution of China, Editors Fletcher, Ali, Aitchison, Geological Society Of America, Spec. Pub.226, pp.247-71China, TibetUHP
DS201112-1131
2011
Robinson, P.T.Yang, J., Xu, X., Li, Y., Liu, Z., Li, J., Ba, D., Robinson, P.T.Diamond discovered from six different ultramafic massifs along the Yarlung Zangbu suture between the Indian and Eurasian plates.Geological Society of America, Annual Meeting, Minneapolis, Oct. 9-12, abstractAsia, IndiaMantle harzburgites
DS201112-1132
2011
Robinson, P.T.Yang, J.S., Robinson, P.T.In situ diamonds and moissanite in podiform chromitites of the Loubusa and Ray-Iz ophiolites, Tibet and Russia.Goldschmidt Conference 2011, abstract p.2209.Russia, Asia, TibetDiamonds
DS201212-0801
2012
Robinson, P.T.Yang, J., Wirth, R., Xu, X., Robinson, P.T., Rong, H.Mineral inclusions in diamonds from ophiolitic peridotite and chromites.GSA Annual Meeting, Paper no. 74-4, abstractChina, TibetDiamond inclusions
DS201312-0990
2012
Robinson, P.T.Yang, J., Wirth, R., Xianhzhen, X., Robinson, P.T., Rong, H.Mineral inclusions in diamonds from ophiolitic peridotite and chromities.Geological Society of America Annual Meeting abstract, Paper 74-4, 1/2p. AbstractTechnologyDiamond inclusions
DS201312-0991
2013
Robinson, P.T.Yang, J., Xu, X., Robinson, P.T.Ophiolite type diamond.Geological Society of America Annual Meeting, Vol. 45, 7, p. 451 abstractTechnologyDiamond genesis
DS201412-0745
2014
Robinson, P.T.Robinson, P.T.The origin and signifcance of crustal minerals in ophiolitic mantle rocks.ima2014.co.za, PosterMantleOphiolites
DS201412-0999
2014
Robinson, P.T.Yang, J., Meng, F., Xu, X., Robinson, P.T., Dilek, Y., Makeyev, A.B., Wirth, R., Wiedenbeck, M., Cliff, J.Diamonds, native elements and metal alloys from chromitites of the Ray-Iz ophiolite of the Polar Urals.Gondwana Research, Vol. 27, 2, pp. 459-485.Asia, TibetUHP ophiolite diamonds
DS201502-0093
2014
Robinson, P.T.Robinson, P.T., Trumbull, R.B., Schmitt, A., Yang, J-S., Li, J-W., Zhou, M-F., Erzinger, J., Dare, S., Xiong, F.The origin and significance of crustal minerals in ophiolitic chromitites and peridotites.Gondwana Research, Vol. 27 2, pp. 486-506.Peridotite
DS201502-0126
2014
Robinson, P.T.Yang, J., Meng, F., Xu, X., Robinson, P.T., Dilek, Y., Makeyev, A.B., Wirth, R., Wiedenbeck, M., Cliff, J.Diamonds, native elements and metal alloys from chromitites of the Ray-Iz ophiolite of the Polar Urals.Gondwana Research, Vol. 27, 2, pp. 459-485.Russia, UralsChromitite
DS201506-0297
2015
Robinson, P.T.Tian, Y., Yang, J., Robinson, P.T., Xiong, F., Li, Y., Zhang, Z., Liu, Z., Liu, F., Niu, X.Diamond discovered in high Al chromitites of the Sartohay ophiolite, Xinjiang province China.Acta Geologica Sinica, Vol. 89, 2, pp. 332-340.ChinaChromitite
DS201506-0302
2015
Robinson, P.T.Zhu, H., Yang, J., Robinson, P.T., Zhu, Y., Zhu, F., Zhao, X., Liu, Z., Zhang, W., Xu, W.The discovery of diamonds in chromitites of the Hegenshan ophiolite, Inner Mongolia, China.Acta Geologica Sinica, Vol. 89, 2, pp. 341-350.China, MongoliaChromitite
DS201510-1816
2015
Robinson, P.T.Yang, J-S., Wirth, R., Xu, X., Tian, Y., Huang, Z., Robinson, P.T., Dilek, Y.Formation of ophiolite hosted diamonds by deep subduction of oceanic lithosphere: evidence from mineral inclusions.GSA Annual Meeting, Paper 81-2, 1p. Abstract onlyMantleMineral inclusions

Abstract: In recent years we have confirmed the existence of ophiolite-hosted diamonds on Earth, which occur in mantle peridotites and podiform chromitites of many ophiolites. These diamonds differ significantly from most kimberlite varieties, particularly in their inclusions. The typical inclusions in the diamonds are Mn-rich phases, i.e., NiMnCo alloy, native Mn, MnO, galaxite, Mn olivine and Mn garnet. Ca-silicate perovskite, a typical lower mantle mineral, was identified as mineral inclusions in diamond. One occurs as a 60-nanometer, euhedral grain associated with NiMnCo alloy and graphite, while another one occurs as a 50-nanometer grain within a large inclusion containing both NiMnCo alloy and Nd-Se-Cu-S phase. By EDS the perovskite has Ca 48.3%, Si 37.7% and Mn 14.1% with oxygen. TEM diffraction data show that the inclusion has d-spacings and angles between adjacent lattice planes are consistent to the Ca-silicate perovskite with an orthorhombic structure. The only known source of such light carbon is organic material in surface sediments and the best known sources of abundant manganese are Fe-Mn-rich sediments and Mn nodules, both of which are common on the seafloor. Many parts of the modern seafloor are also covered by sediments with a continental provenance. Phases such as SiO2 and Al2O3 are not expected in mantle peridotites and must have been introduced from shallow levels. We propose that subduction of oceanic lithosphere carries C, Mn, Si, Al and REE to the transition zone or lower mantle where the material is mixed with highly reduced material, perhaps derived from greater depths. Crystallization of diamond from a C-rich fluid encapsulates the observed inclusions. The diamonds and associated minerals are incorporated into chromite grains during chromite crystallization at depth of mantle transition zone, and are carried to shallower levels by mantle convection. Accumulation of chromite grains produces podiform chromitites containing a range of exotic minerals. However, the presence of diamonds and other UHP minerals in ophiolitic peridotites indicates that such phases can persist far outside their normal stability fields.
DS201512-1994
2015
Robinson, P.T.Yang, J., Dilek, Y., Robinson, P.T.Diamond and recycled mantle: a new perspectve - introduction of IGCP 649 project. OphiolitesActa Geologica Sinica, Vol. 89, 3, pp. 1036-1038.MantleDiamond genesis
DS201601-0050
2015
Robinson, P.T.Yang, J., Wirth, R., Xiong, F., Tian, Y., Huang, Z., Robinson, P.T., Dilek, Y.The lower mantle minerals in ophiolite hosted diamond.Acta Geologica Sinica, Vol. 89, 2, pp. 108-109.MantleMineralogy
DS201603-0395
2015
Robinson, P.T.Lian, D., Yang, J., Dilek, Y., Robinson, P.T., Wu, W., Wang, Y., Liu, F., Ding, Yi.Diamonds and moissanite from the aladag ophiolite of the eastern Tauride belt, southern Turkey: a final report.Geological Society of America Annual Meeting, Vol. 47, 7, p. 163. abstractEurope, TurkeyMoissanite

Abstract: The Aladag ophiolite in the eastern Tauride belt, southern Turkey, is a well-preserved remnant of oceanic lithosphere. It consists of, in ascending order, harzburgitic to dunitic tectonites, ultramafic and mafic cumulates, isotropic gabbros, sheeted dikes and basaltic pillow lavas. Podiform chromitites are common in the mantle peridotites. Thus far, more than 200 grains of microdiamond and more than 100 grains of moissanite (SiC) have been separated from one sample of podiform chromitite. The microdiamonds occur mostly as subhedral to euhedral, colorless to pale yellow grains, about 50-300 µm in size. Moissanite grains are generally subhedral, light blue to deep blue in color and variable in size. These grains of diamond and moissanite are very similar to in-situ grains in podiform chromitites of Tibet and the Polar Urals of Russia (Yang et al., 2014; 2015), indicating that they are natural minerals, not the result of natural or anthropogenic contamination. As reported elsewhere, the diamonds and moissanite are accompanied by a range of other minerals, including rutile, zircon, quartz and sulfides. The discovery of diamond, moissanite and other unusual minerals in the podiform chromitites of the Aladag massif provide additional evidence for the widespread occurrence of these minerals in ophiolites, indicating that they are related to global mantle processes.
DS201605-0922
2016
Robinson, P.T.Xiong, F., Yang, J., Robinson, P.T., Xu, X., Ba, D., Li, Y., Zhang, Z., Rong, H.Diamonds ad other exotic minerals recovered from peridotites of the Dangqiong ophiolite, western Yarlung-Zangbo suture zone, Tibet.Acta Geologica Sinica, Vol. 90, 2, pp. 425-439.Asia, TibetPeridotite

Abstract: Various combinations of diamond, moissanite, zircon, quartz, corundum, rutile, titanite, almandine garnet, kyanite, and andalusite have been recovered from the Dangqiong peridotites. More than 80 grains of diamond have been recovered, most of which are pale yellow to reddish-orange to colorless. The grains are all 100-200 µm in size and mostly anhedral, but with a range of morphologies including elongated, octahedral and subhedral varieties. Their identification was confirmed by a characteristic shift in the Raman spectra between 1325 cm-1 and 1333 cm-1, mostly at 1331.51 cm-1 or 1326.96 cm-1. Integration of the mineralogical, petrological and geochemical data for the Dongqiong peridotites suggests a multi-stage formation for this body and similar ophiolites in the Yarlung-Zangbo suture zone. Chromian spinel grains and perhaps small bodies of chromitite crystallized at various depths in the upper mantle, and encapsulated the UHP, highly reduced and crustal minerals. Some oceanic crustal slabs containing the chromian spinel and their inclusion were later trapped in suprasubduction zones (SSZ), where they were modified by island arc tholeiitic and boninitic magmas, thus changing the chromian spinel compositions and depositing chromitite ores in melt channels.
DS201607-1376
2016
Robinson, P.T.Robinson, P.T.The significance of zircon in oceanic mantle peridotites and chromitites.IGC 35th., Session The Deep Earth 1 p. abstractMantlePeridotite
DS201612-2349
2016
Robinson, P.T.Yang, J., Robinson, P.T., Dilek, Y.Geological occurrences of diamond-bearing ophiolites.Acta Geologica Sinica, Vol. 90, 1, July abstract P. 216GlobalUHP
DS201709-2076
2017
Robinson, P.T.Xiong, F., Yang, J., Robinson, P.T., Dilek, Y., Milushi, I., Xu, X., Zhou, W., Zhang, Z., Rong, H.Diamonds discovered from high-Cr podiform chromitites from Bulqiza, eastern Mirdita ophiolite, Albania.Acta Geologica Sinica, Vol. 91, 2, pp. 455-468.Europe, Albaniadiamonds in chromitites

Abstract: Various combinations of diamond, moissanite, zircon, corundum, rutile and titanitehave been recovered from the Bulqiza chromitites. More than 10 grains of diamond have been recovered, most of which are pale yellow to reddish–orange to colorless. The grains are all 100–300 µm in size and mostly anhedral, but with a range of morphologies including elongated, octahedral and subhedral varieties. Their identification was confirmed by a characteristic shift in the Raman spectra between 1325 cm-1 and 1333 cm-1, mostly at 1331.51 cm-1 or 1326.96 cm-1. This investigation extends the occurrence of diamond and moissanite to the Bulqiza chromitites in the Eastern Mirdita Ophiolite. Integration of the mineralogical, petrological and geochemical data of the Bulqiza chromitites suggests their multi–stage formation. Magnesiochromite grains and perhaps small bodies of chromitite formed at various depths in the upper mantle, and encapsulated the ultra–high pressure, highly reduced and crustal minerals. Some oceanic crustal slabs containing the magnesiochromite and their inclusion were later trapped in suprasubduction zones, where they were modified by tholeiitic and boninitic arc magmas, thus changing the magnesiochromite compositions and depositing chromitite ores in melt channels.
DS201710-2262
2017
Robinson, P.T.Robinson, P.T., Yang, J., Tian, Y., Zhu, H.Diamonds, super reduced and crustal minerals in chromitites of the Hegenshan and Sartohay ophiolites, central Asian orogenic belt, China.Acta Geologica Sinica, Vol. 91, s1, p. 32 abstractChinadiamond inclusions

Abstract: The Central Asian Orogenic Belt (CAOB) is a huge tectonic mélange that lies between the North China Craton and the Siberian Block. It is composed of multiple orogenic belts, continental fragments, magmatic and metamorphic rocks, suture zones and discontinuous ophiolite belts. Although the Hegenshan and Sartohay ophiolites are separated by nearly 3000 km and lie in completely different parts of the CAOB, they are remarkably similar in many respects. Both are composed mainly of serpentinized peridotite and dunite, with minor gabbro and sparse basalt. They both host significant podiform chromitites that consist of high-Al, refractory magnesiochromite with Cr#s [100Cr/(Cr+Al)] averaging >60. The Sartohay ophiolite has a zircon U-Pb age of ca. 300 Ma and has been intruded by granitic plutons of similar age, resulting in intense hydrothermal activity and the formation of gold-bearing listwanites. The age of the Hegenshan is not firmly established but is thought to have formed in the Carboniferous. Like many other ophiolites that we have investigated in other orogenic belts, the chromitites in these two bodies have abundant diamonds, as well as numerous super-reduced and crustal minerals. The diamonds are mostly, colorless to pale yellow, 200-300 µm across and have euhedral to anhedral shapes. They all have low carbon isotopes (d14C = -18 to -29) and some have visible inclusions. These are accompanied by numerous super-reduced minerals such as moissanite, native elements (Fe, Cr, Si, Al, Mn), and alloys (e.g., Ni-Mn-Fe, Ni-Fe-Al, Ni-Mn-Co, Cr-Ni-Fe, Cr-Fe, Cr-Fe-Mn), as well as a wide range of oxides, sulfides and silicates. Grains of zircon are abundant in the chromitites of both ophiolites and range in age from Precambrian to Cretaceous, reflecting both incorporation of old zircons and modification of grains by hydrothermal alteration. Our investigation confirms that high-Al, refractory chromitites in these two ophiolites have the same range of exotic minerals as high-Cr metallurgical chromitites such as those in the Luobusa ophiolite of Tibet. These collections of exotic minerals in ophiolitic chromitites indicate complex, multi-stage recycling of oceanic and continental crustal material at least to the mantle transition zone, followed by uprise and emplacement of the peridotites into relatively shallow ophiolites.
DS201802-0261
2017
Robinson, P.T.Robinson, P.T., Yang, J., Tian, Y., Zhu, H.Diamonds, super reduced and crustal minerals in chromitites of the Hegenshan and Sartohay ophiolites, central Asian orogenic belt, China.Acta Geologica Sinica, Vol. 91, 1, p. 32.Asia, Chinamineralogy

Abstract: The Central Asian Orogenic Belt (CAOB) is a huge tectonic mélange that lies between the North China Craton and the Siberian Block. It is composed of multiple orogenic belts, continental fragments, magmatic and metamorphic rocks, suture zones and discontinuous ophiolite belts. Although the Hegenshan and Sartohay ophiolites are separated by nearly 3000 km and lie in completely different parts of the CAOB, they are remarkably similar in many respects. Both are composed mainly of serpentinized peridotite and dunite, with minor gabbro and sparse basalt. They both host significant podiform chromitites that consist of high-Al, refractory magnesiochromite with Cr#s [100Cr/(Cr+Al)] averaging >60. The Sartohay ophiolite has a zircon U-Pb age of ca. 300 Ma and has been intruded by granitic plutons of similar age, resulting in intense hydrothermal activity and the formation of gold-bearing listwanites. The age of the Hegenshan is not firmly established but is thought to have formed in the Carboniferous.Like many other ophiolites that we have investigated in other orogenic belts, the chromitites in these two bodies have abundant diamonds, as well as numerous super-reduced and crustal minerals. The diamonds are mostly, colorless to pale yellow, 200-300 µm across and have euhedral to anhedral shapes. They all have low carbon isotopes (d14C = -18 to -29) and some have visible inclusions. These are accompanied by numerous super-reduced minerals such as moissanite, native elements (Fe, Cr, Si, Al, Mn), and alloys (e.g., Ni-Mn-Fe, Ni-Fe-Al, Ni-Mn-Co, Cr-Ni-Fe, Cr-Fe, Cr-Fe-Mn), as well as a wide range of oxides, sulfides and silicates. Grains of zircon are abundant in the chromitites of both ophiolites and range in age from Precambrian to Cretaceous, reflecting both incorporation of old zircons and modification of grains by hydrothermal alteration. Our investigation confirms that high-Al, refractory chromitites in these two ophiolites have the same range of exotic minerals as high-Cr metallurgical chromitites such as those in the Luobusa ophiolite of Tibet. These collections of exotic minerals in ophiolitic chromitites indicate complex, multi-stage recycling of oceanic and continental crustal material at least to the mantle transition zone, followed by uprise and emplacement of the peridotites into relatively shallow ophiolites.
DS201807-1538
2015
Robinson, P.T.Yang, J., Robinson, P.T., Dilek, Y.Diamond bearing ophiolites and their geological occurrence. ** note dateEpisodes, Vol. 38, 4, pp. 344-364.China, Tibet, Russiaophiolites

Abstract: We document in this study the geological occurrence of diamonds and other ultrahigh-pressure (UHP) minerals in ophiolitic mantle peridotites and podiform chromitites from different orogenic belts. These minerals exist in both high-Cr and high-Al chromitites. Most ophiolite-hosted diamonds are small (~ 200-500 µm across), and some contain distinctive inclusions (i.e., coesite, Ni-Mn-Co alloys, spessartite, tephroite). All of the analyzed diamonds have extremely light carbon isotope compositions (d13C = -28.7 to -18.3‰) and variable trace element contents that distinguish them from most kimberlitic and UHP metamorphic varieties. A wide range of highly reduced minerals, such as native elements, Ni-Mn-Co alloys, Fe-Si and Fe-C phases and moissanite (SiC) also occuras accompanying mineral separates confirming the super-reducing conditions of their environment of formation. The presence of exsolution lamellae of diopside and coesite in some chromite grains suggests chromite crystallization depths around >380 km, near the mantle transition zone. Carbon and other recycled crustal materials at these depths are likely to have been derived from previously subducted material. The peridotites encapsulating the podiform chromitites and diamonds were transported to shallow mantle by convection cells beneath oceanic spreading centers. The chromitites may have formed in the deep mantle or in shallow suprasubduction zone environments. Our observations suggest that diamonds, UHP minerals and recycled crustal material are likely to be ubiquitous in the oceanic mantle.
DS201810-2390
2018
Robinson, P.T.Yang, J.S., Trumball, R.B., Robinson, P.T., Xiong, F.H., Lian, D.Y.Comment: Ultra high pressure and ultra reduced minerals in ophiolites may form by lightning strikes. Super Reduced Minerals SURGeochemical Perspectives Letters, Vol. 8, pp. 6-7.Mantlemoissanite
DS201908-1827
2018
Robinson, P.T.Yang, J., Robinson, P.T., Xu, X., Xiong, F., Lian, D.Diamond in oceanic peridotites and chromitites: evidence for deep recycled mantle in the global ophiolite record.International Symposium on Deep Earth Exploration and Practices, Beijing Oct. 24-26. 1 p. abstractChinadiamond genesis

Abstract: Diamonds have been discovered in mantle peridotites and chromitites of six ophiolitic massifs along the 1300 km-long Yarlung-Zangbo suture (Bai et al., 1993; Yang et al., 2014; Xu et al., 2015), and in the Dongqiao and Dingqing mantle peridotites of the Bangong-Nujiang suture in the eastern Tethyan zone (Robinson et al., 2004; Xiong et al., 2018). Recently, in-situ diamond, coesite and other UHP mineral have also been reported in the Nidar ophiolite of the western Yarlung-Zangbo suture (Das et al., 2015, 2017). The above-mentioned diamond-bearing ophiolites represent remnants of the eastern Mesozoic Tethyan oceanic lithosphere. New publications show that diamonds also occur in chromitites in the Pozanti-Karsanti ophiolite of Turkey, and in the Mirdita ophiolite of Albania in the western Tethyan zone (Lian et al., 2017; Xiong et al., 2017; Wu et al., 2018). Similar diamonds and associated minerals have also reported from Paleozoic ophiolitic chromitites of Central Asian Orogenic Belt of China and the Ray-Iz ophiolite in the Polar Urals, Russia (Yang et al., 2015a, b; Tian et al., 2015; Huang et al, 2015). Importantly, in-situ diamonds have been recovered in chromitites of both the Luobusa ophiolite in Tbet and the Ray-Iz ophiolite in Russia (Yang et al., 2014, 2015a). The extensive occurrences of such ultra-high pressure (UHP) minerals in many ophiolites suggest formation by similar geological events in different oceans and orogenic belts of different ages. Compared to diamonds from kimberlites and UHP metamorphic belts, micro-diamonds from ophiolites present a new occurrence of diamond that requires significantly different physical and chemical conditions of formation in Earth's mantle. The forms of chromite and qingsongites (BN) indicate that ophiolitic chromitite may form at depths of >150-380 km or even deeper in the mantle (Yang et al., 2007; Dobrthinetskaya et al., 2009). The very light C isotope composition (d13C -18 to -28‰) of these ophiolitic diamonds and their Mn-bearing mineral inclusions, as well as coesite and clinopyroxene lamallae in chromite grains all indicate recycling of ancient continental or oceanic crustal materials into the deep mantle (>300 km) or down to the mantle transition zone via subduction (Yang et al., 2014, 2015a; Robinson et al., 2015; Moe et al., 2018). These new observations and new data strongly suggest that micro-diamonds and their host podiform chromitite may have formed near the transition zone in the deep mantle, and that they were then transported upward into shallow mantle depths by convection processes. The in-situ occurrence of micro-diamonds has been well-demonstrated by different groups of international researchers, along with other UHP minerals in podiform chromitites and ophiolitic peridotites clearly indicate their deep mantle origin and effectively address questions of possible contamination during sample processing and analytical work. The widespread occurrence of ophiolite-hosted diamonds and associated UHP mineral groups suggests that they may be a common feature of in-situ oceanic mantle. The fundamental scientific question to address here is how and where these micro-diamonds and UHP minerals first crystallized, how they were incorporated into ophiolitic chromitites and peridotites and how they were preserved during transport to the surface. Thus, diamonds and UHP minerals in ophiolites have raised new scientific problems and opened a new window for geologists to study recycling from crust to deep mantle and back to the surface.
DS201909-2109
2019
Robinson, P.T.Yang, J., Lian, D., Robinson, P.T., Qiu, T., Xiong, F., Wu, W.A shallow origin for diamonds in ophiolitic chromitites. Geology, Vol. 47, pp. e475.North America, Mexicomicrodiamonds
DS1975-0421
1976
Robinson, R.Steeples, D.W., Yarger, H.L., Robinson, R.Integrated Geophysical Exploration for Kimberlites in KansasEos, Vol. 57, No. 10, P. 762, (ABTR.).GlobalKimberlite, Central States, Geophysics
DS1995-1583
1995
Robinson, R.J.Robinson, R.J.A profile of the international diamond marketPaper presented at World Diamond Conference March 17, 20p.GlobalDiamond markets, Economics
DS1996-1557
1996
Robinson, S.Wolfe, S., Burgess, M., Douma, M., Hyde, C., Robinson, S.Geological and geophysical investigations of ground ice glaciofluvialdeposits, Slave Province.Northwest Territories Exploration Overview, Nov. 26, p. 3-37.Northwest TerritoriesGeological, geophysics, geomorphology, Slave Province
DS201312-0044
2013
Robinson, S.Ayuso, R., Tucker, R., Peters, S., Foley, N., Jackson, J., Robinson, S., Bove, M.Preliminary radiogenic isotope study on the origin of the Khanneshin carbonatite complex, Helmand Province, Afghanistan.Journal of Geochemical Exploration, Vol. 133, pp. 6-14.AfghanistanCarbonatite
DS201608-1435
2016
Robinson, S.Robinson, S.The magnificent mineral and gem collections of the Royal Ontario Museum in Toronto.Rocks and Minerals, Vol. 9, 2, pp. 154-163.Canada, OntarioGem collection
DS1994-1291
1994
Robinson, S.W.Nyblade, A.A., Robinson, S.W.The African superswellGeophysical Research Letters, Vol. 21, No. 9, May 1, pp. 765-768.GlobalStructure, rifting, Geophysics -bathymetry
DS201012-0569
2010
RobinsonsPaulen, R.C., Adcock, S.W., Spirito, W.A., Chorlton, L.B., McClenaghan, M.B., Oviatt, Budulan, RobinsonsInnovative methods to search, download and display indicator mineral data: a new Tri-Territorial Indicator Mineral Database.38th. Geoscience Forum Northwest Territories, Abstract pp. 75-76.Canada, Northwest TerritoriesGEM database
DS1975-0395
1976
Robison, E.C.Robison, E.C.Geochemistry of Lamprophyric Rocks of the Eastern Ouachita Mountains, Arkansaw.Msc. Thesis, University Arkansaw, 147P.United States, Oklahoma, ArkansasGeochemistry
DS1975-0420
1976
Robison, E.C.Steele, K.F., Robison, E.C.Chemical Relationships of Lamprophyre, Central ArkansawEos, Vol. 57, P. 1018. (abstract.).United States, Gulf Coast, ArkansasGeochemistry
DS1975-0604
1977
Robison, E.C.Robison, E.C., Steele, K.F., Jackson, K.C.Geochemistry of Lamprophyric Rocks, Eastern Ouachita Mountains, Arkansaw.Geological Society of America (GSA), Vol. 9, No. 1, PP. 69-70.United States, Oklahoma, Gulf Coast, Arkansas, Garland CountyPetrology, Geochemistry
DS1975-0630
1977
Robison, E.C.Steele, K.F., Robison, E.C.Chemical Weathering of Lamprophyric Rock, Central ArkansawArkansaw Academy of Science Proceedings, Vol. 31, PP. 119-121.United States, Gulf Coast, ArkansasPetrology, Geomorphology
DS1991-1894
1991
Robison, H.R.Wyatt, B.A., Shee, S.R., Griffin, W.L., Zweistra, P., Robison, H.R.The petrology of the Cleve kimberlite, Eyre Peninsula, South AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 463-465AustraliaPetrography, Mineral chemistry
DS1994-1956
1994
Robison, H.R.Wyatt, B.A., Shee, S.R., Griffin, W.L., Zweistra, P., Robison, H.R.The petrology of the Cleve kimberlite, Eyre Peninsula South AustraliaProceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 62-79.AustraliaKimberlite, Deposit -Cleve
DS1989-1286
1989
Robison, I.M.Robison, I.M.Flow through share rulesMine Financing seminar, held April 17th. Toronto, approx. 50 pages (27p. text and slides reprod. DatabaseGlobalEconomics, Flow through rules
DS201906-1342
2019
Robles Cruz, S.Robles Cruz, S., Melgarejo, J.C., Gali, S.Revisiting the complexity of kimberlites from northeastern Angola.GAC/MAC annual Meeting, 1p. Abstract p. 166.Africa, Angoladeposit - Catoca

Abstract: The tectonic setting of northeastern Angola was influenced by the opening of the South Atlantic Ocean, which reactivated deep NE-SW-trending faults during the early Cretaceous. The new interpretation of a kimberlitic pulse during the middle of the Aptian and the Albian, which provides precise data on the age of a significant diamond-bearing kimberlite pulse in Angola, will be an important guide in future diamond exploration. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration. Six kimberlite pipes within the Lucapa structure in northeastern Angola have been investigated using major and trace element geochemistry of mantle xenoliths, macro- and megacrysts. Geothermobarometric calculations were carried out using xenoliths and well-calibrated single crystals of clinopyroxene. Geochronological and isotopic studies were also performed where there were samples available of sufficient quality. Results indicate that the underlying mantle experienced variable conditions of equilibration among the six sites. Subsequent metasomatic enrichment events also support a hypothesis of different sources for these kimberlites. The U/Th values suggest at least two different sources of zircon crystals from the Catoca suite. These different populations may reflect different sources of kimberlitic magma, with some of the grains produced in U- and Th-enriched metasomatized mantle units, an idea consistent with the two populations of zircon identified on the basis of their trace element compositions. This research shows the absence of fresh Mg-rich ilmenite in the Catoca kimberlite (one of the largest bodies of kimberlite in the world), as well as the occurrence of Fe3+-rich ilmenite, do not exclude the presence of diamond in the kimberlite. This is a new insight into the concept of ilmenite and diamond exploration and leads to the conclusion that compositional attributes must be evaluated in light of textural attributes.
DS201012-0631
2010
Robles-Cruz, S.Robles-Cruz, S.Disclosed dat a from mantle xenoliths of Angolan kimberlites based on LA-IPC-MS analyses.International Mineralogical Association meeting August Budapest, AbstractAfrica, AngolaMineralogy
DS201112-0872
2011
Robles-Cruz, S.Robles-Cruz, S.Comparative compositions of xenocrysts of garnet, clinopyroxene, and ilmenite from Diamondiferous and barren kimberlites from northeastern Angola.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, AbstractAfrica, AngolaPetrology
DS201212-0589
2009
Robles-Cruz, S.Robles-Cruz, S., Lomba, A., Melgarejo, J-C., Gali, S., Olimpio Goncalves, A.The Cucumbi kimberlite, NE Angola: problems to discriminate fertile and barren kimberlites.Revist de la Sociedad de Mineralogia ( in english), pp. 159-160.Africa, AngolaDeposit - Cucumbi
DS201808-1784
2012
Robles-Cruz, S.Robles-Cruz, S., Melgarejo, J.C., Escayola, M.Major and trace element compositions of indicator minerals that occur as macro and megacrysts, and xenoliths from kimberlites in northeastern Angola.Minerals, Vol. 2, 4, ppp. 318-337.Africa, Angolageochemistry

Abstract: In this study, we compare the major- and trace-element compositions of olivine, garnet, and clinopyroxene that occur as single crystals (142 grains), with those derived from xenoliths (51 samples) from six kimberlites in the Lucapa area, northeastern Angola: Tchiuzo, Anomaly 116, Catoca, Alto Cuilo-4, Alto Cuilo-63 and Cucumbi-79. The samples were analyzed using electron probe microanalysis (EPMA) and laser-ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results suggest different paragenetic associations for these kimberlites in the Lucapa area. Compositional overlap in some of the macrocryst and mantle xenolith samples indicates a xenocrystic origin for some of those macrocrysts. The presence of mantle xenocrysts suggests the possibility of finding diamond. Geothermobarometric calculations were carried out using EPMA data from xenoliths by applying the program PTEXL.XLT. Additional well calibrated single-clinopyroxene thermobarometric calculations were also applied. Results indicate the underlying mantle experienced different equilibration conditions. Subsequent metasomatic enrichment events also support a hypothesis of different sources for the kimberlites. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration.
DS200912-0635
2009
Robles-Cruz, S.E.Robles-Cruz, S.E., Watangua, M., Isidoro, l., Melgarejo, J.C., Gali, S., Olimpo, A.Contrasting compositions and textures of ilmenite in the Catoca kimberlite, Angola, and implications in exploration for diamond.Lithos, In press - available formatted 10p.Africa, AngolaDeposit - Catoca
DS201012-0632
2010
Robles-Cruz, S.E.Robles-Cruz, S.E., Escayola, M., Melgarejo, J.C., Watangua, M., Gali, S., Goncalves, O.A., Jackson, S.Disclosed dat a from mantle xenoliths of Angolan kimberlites based on LA-ICP-MS analyses. Catoca and Cucumbi-79International Mineralogical Association meeting August Budapest, abstract p. 553.Africa, AngolaPetrology
DS201112-0873
2011
Robles-Cruz, S.E.Robles-Cruz, S.E., Melgarejo, J.C., Escayola, M., Watangua, M., Pervov,V.Comparative composition of xenocrysts of garnet, clinopyroxene, and ilmenite from Diamondiferous and barren kimberlites from northeastern Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.129-131.Africa, AngolaCatoca, Kambundu, Tchiuzo, Cuilo
DS201112-0874
2011
Robles-Cruz, S.E.Robles-Cruz, S.E., Melgarejo, J.C., Escayola, M., Watangua, M., Pervov,V.Comparative composition of xenocrysts of garnet, clinopyroxene, and ilmenite from Diamondiferous and barren kimberlites from northeastern Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.129-131.Africa, AngolaCatoca, Kambundu, Tchiuzo, Cuilo
DS201212-0590
2012
Robles-Cruz, S.E.Robles-Cruz, S.E., Escayola, M., Jackson, S., Gali, S., Pervov, S., Watanga, M., Goncalves, A., Melgarejo, J.C.U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: implications for diamond exploration.Chemical Geology, Vol. 310-311, pp. 137-147.Africa, AngolaDeposit - Catoca
DS201212-0591
2012
Robles-Cruz, S.E.Robles-Cruz, S.E., Galla, S., Escayoblab, M., Melgarejoa, J.C.Heterogeneous mantle beneath the Lunda area in Angola.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, AngolaDeposit - Lunda area
DS201710-2263
2012
Robles-Cruz, S.E.Robles-Cruz, S.E., Melgarejo, J.C., Gali, S., Escayola, M.Major and trace element compositions of indicator minerals that occur as macro and megacrysts, and of xenoliths, from kimberlites in northeastern Angola.Minerals NOTE Date, Vol. 2, pp. 318-337.Africa, Angoladeposits - Tchiuzo, Anomaly 116, Catoca, Alt Cuilo-4, Cuilo-63, Cucumbi-79.

Abstract: In this study, we compare the major- and trace-element compositions of olivine, garnet, and clinopyroxene that occur as single crystals (142 grains), with those derived from xenoliths (51 samples) from six kimberlites in the Lucapa area, northeastern Angola: Tchiuzo, Anomaly 116, Catoca, Alto Cuilo-4, Alto Cuilo-63 and Cucumbi-79. The samples were analyzed using electron probe microanalysis (EPMA) and laser-ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results suggest different paragenetic associations for these kimberlites in the Lucapa area. Compositional overlap in some of the macrocryst and mantle xenolith samples indicates a xenocrystic origin for some of those macrocrysts. The presence of mantle xenocrysts suggests the possibility of finding diamond. Geothermobarometric calculations were carried out using EPMA data from xenoliths by applying the program PTEXL.XLT. Additional well calibrated single-clinopyroxene thermobarometric calculations were also applied. Results indicate the underlying mantle experienced different equilibration conditions. Subsequent metasomatic enrichment events also support a hypothesis of different sources for the kimberlites. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration.
DS202005-0743
2020
Robles-Cruz, S.E.Kostrovitsky, S.I., Yakolev, D.A., Soltys, A., Ivanov, A.S., Matsyuk, S.S., Robles-Cruz, S.E.A genetic relationship between magnesian ilmenite and kimberlites of the Yakutian diamond fields.Ore Geology Reviews, Vol. 120, 16p. PdfRussia, Yakutiailmenite

Abstract: We present new major element geochemical data, and review the existing data for ilmenite macrocrysts, megacrysts, as well as ilmenite in mantle xenoliths from four diamondiferous kimberlite fields in the Yakutian province. This combined data set includes 10,874 analyses of ilmenite from 94 kimberlite pipes. In the studied samples we identify various different ilmenite compositional distributions (e.g., “Haggerty's parabola”, or “Step-like” trends in MgO-Cr2O3 bivariate space), which are common to all kimberlites from a given cluster, but the compositional distributions differ between clusters. We propose three stages of ilmenite crystallization: 1) Mg-Cr poor ilmenite crystallising from a primitive asthenospheric melt (the base of Haggerty's parabola on MgO-Cr2O3 plots). 2) This primitive asthenospheric melt was then modified by the partial assimilation of lithospheric material, which enriched the melt in MgO and Cr2O3 (left branch of Haggerty’s parabola). 3) Ilmenite subsequently underwent sub-solidus recrystallization in the presence of an evolved kimberlite melt under increasing oxygen fugacity (ƒO2) conditions (right branch of Haggerty’s parabola in MgO-Cr2O3 plots). Significant differences in the ilmenite compositional distribution between different kimberlite fields are the result of diverse conditions during subsequent ilmenite crystallization in a kimberlite melt ascending through the lithospheric mantle, which have different textures and compositions beneath the studied kimberlite fields. We propose that a TiO2 fluid formed due to immiscibility of an asthenospheric melt with low Cr and high Ti contents. This fluid infiltrated lithospheric mantle rocks forming Mg-ilmenite. These features indicate a genetic link between ilmenite and the host kimberlite melt.
DS201612-2331
2016
Robles-Stefoni, L.Robles-Stefoni, L., Dimitrakopoulos, R.Stochastic simulation of the Fox kimberlitic diamond pipe, Ekati mine, Northwest Territories, Canada.Journal of South African Institute of Mining and Metallurgy, Vol. 116, Feb. pp. 189-201.Canada, Northwest TerritoriesDeposit - Fox, Ekati

Abstract: Multiple-point simulation (MPS) methods have been developed over the last decade as a means of reproducing complex geological patterns while generating stochastic simulations. Some geological spatial configurations are complex, such as the spatial geometries and patterns of diamond-bearing kimberlite pipes and their internal facies controlling diamond quality and distribution. Two MPS methods were tested for modelling the geology of a diamond pipe located at the Ekati mine, NT, Canada. These are the single normal equation simulation algorithm SNESIM, which captures different patterns from a training image (TI), and the filter simulation algorithm FILTERSIM, which classifies the patterns founded on the TI. Both methods were tested in the stochastic simulation of a four-category geology model: crater, diatreme, xenoliths, and host rock. Soft information about the location of host rock was also used. The validation of the simulation results shows a reasonable reproduction of the geometry and data proportions for all geological units considered; the validation of spatial statistics, however, shows that although simulated realizations from both methods reasonably reproduce the fourth-order spatial statistics of the TI, they do not reproduce well the same spatial statistics of the available data (when this differs from the TI). An interesting observation is that SNESIM better imitated the shape of the pipe, while FILTERSIM yielded a better reproduction of the xenolith bodies.
DS1996-1413
1996
Robnins, B.Tegner, C., Robnins, B., Sorensen, H.S.Crystallization from stratified magmas in the Honningsvag intrusive Suite:a reappraisalMineralogical Magazine, Vol. 60, No. 1, Feb pp. 41-52NorwayMagma -layered intrusive, Honningsvag
DS1991-1438
1991
Robson, N.S.Robson, N.S.Elemental analysis: the changing role for XRFIndustrial Minerals, No. 283, April pp. 63, 65-67GlobalGeochemistry, X-ray fluoresence
DS200512-0943
2005
Rocabado, V.Schmitz, M., Martins, A., Izarra, C., Jacome, M.I., Sanchez, J., Rocabado, V.The major features of the crustal structure in northeastern Venezuela from deep wide angle seismic observations and gravity modelling.Tectonophysics, Vol. 399, 1-4, April 27, pp. 109-124.South America, VenezuelaGeophysics - seismics, crustal structure, tectonics
DS201702-0234
2016
Rocca, M.Presser, J.L.B., Farina-Dolsa, S., Larroza-Cristaldo, F.A., Rocca, M., Alonso, R.N., Acededo, R.D., Cabral-Antunez, N.D., Baller, L., Zarza-Lima, P.R., Sekatcheff, J.M.Modeled mega impact structures in Paraguay: II the eastern region. **PortBoletin del Museo Nacional de Historia Narural del Paraguay, Vol. 20, 2, pp. 205-213. pdf available in * PortSouth America, ParaguayImpact Crater

Abstract: We report here the discovery and study of several new modeled large impact craters in Eastern Paraguay, South America. They were studied by geophysical information (gravimetry, magnetism), field geology and also by microscopic petrography. Clear evidences of shock metamorphic effects were found (e.g., diaplectic glasses, PF, PDF in quartz and feldspar) at 4 of the modeled craters: 1) Negla: diameter:~80-81 km., 2) Yasuka Renda D:~96 km., 3) Tapyta, D: ~80 km. and 4) San Miguel, D: 130-136 km. 5) Curuguaty, D: ~110 km. was detected and studied only by geophysical information. Target-rocks range goes from the crystalline Archaic basement to Permian sediments. The modeled craters were in some cases cut by tholeiitic/alkaline rocks of Mesozoic age and partially covered by lavas of the basaltic Mesozoic flows (Negla, Yasuka Renda, Tapyta and Curuguaty). One of them was covered in part by sediments of Grupo Caacupé (age: Silurian/Devonian). Some of these modeled craters show gold, diamonds, uranium and REE mineral deposits associated. All new modeled large impact craters are partially to markedly eroded.
DS201908-1804
2019
Rocca, M.Presser, J.B.L., Alonso, R., Rocca, M.Malvinas Islands ( Falkland Islands): advances in the inferred buried marine impact mega-structure.Researchgate, July 27p. PdfFalkland Islandsimpact structure

Abstract: In 1992 Rampino noticed a large, almost circular negative gravity anomaly (~30 mGal) on the Falkland Plateau to the WNW of Malvinas Islands/Falklnad Islands using satellite data then available, and speculated that it might be associated with a large (~250 km wide?) buried impact structure. In some more recent compilations Rocca & Presser (2015) and Rocca et al. (2017) was attended the Malvinas Islands/Falklnad Islands “buried impact structure” with particular care; but also these works was harshly criticized. The present text, which is an advance to demonstrate the certain possibilities that this Malvinas Islands/Falklnad Islands It could really be a very probable mega impact structure, gathers shows and evaluates the existing and available indirect information; like gravimetry (Isostasy, Free-air and Bouguer); seismic reflection (Geco Prakla); and, even commenting aspects of its magnetic behavior and its local geology. In all gravimetric analyses from the Malvinas Islands/Falklnad Islands “buried impact structure” it can be shown that an annulus of positive gravity anomaly surrounding a circular oval depression of negative (isostasy and Free-air)/much lower (Bouguer) values gravity anomaly. The most relevant gravimetric information would be the near circular to oval Bouguer gravity low anomaly (with a minimum value of ~150 mGal) surrounded by at least circular ~255 kilometers wide circular ring of positive gravity anomaly (maximum ~225 mGal); a very high values of Bouguer anomaly that are highly compatible with what is expected to be found in mega impact structures. The Malvinas probable impact structure shows almost 100 mGal superior to the volcanic complex of Iceland; so it seems obvious that Malvinas probable impact structure moves away from a speculation by mega-paleo-volcano origin. When gravimetrically modeled, a probable peak ring of ~255 km is evidenced; as well as, the inferred the ~550 km probable rim-crest; configuration that reproduces an almost perfect and symmetrical modeling of a very probable giant impact structure with its clear visible the very probable elements: rim crest-annulus basin-peak ring-central basin-peak ring-annulus basin-rim crest. Four Geco Prakla seismic reflection lines on the area located to the SW of the potential peak ring show a vertical and disturbed crystalline basement (the “peak ring”); in three of them, the “central basin” what would it be filled with sediments after impact (probable ejecta). Using the empirical formula of Assumpção et al. (2013) calculation for crustal thickness could be found very clearly strong CT distortion along Malvinas very probable giant impact structure: around 3400-4000 meters; as is to be expected in terrestrial mega impact structure. Harness the EMAG2v3 a global Earth Magnetic Anomaly Grid compiled from satellite (Meyer et al., 2017) for the Malvinas very probable giant impact structure a well superior anomaly was found and better definition than observed, using the same information, to the one characterized by the impact crater Chicxulub. The geological map of the Falkland Islands Government that was placed on top of the modeling isostasy gravimetric map where the approximate circumference of the very probable peak-ring and the very probable rim-crest is highlighted. This information allows to see that the largest island (West Malvinas) would be part of the very probable peak-ring and the smaller island (East Malvinas) would be part of the very probable rim-crest; both separated by the depression that would correspond to the very probable annulus basin. Based on what was analyzed in the Malvinas Islands area, we concluded the Malvinas exhibited geophysics traits of a large ancient asteroid impact; i.e. Malvinas very probable giant impact structure. Very probable impact structure what could be among one of the world's largest impact crater.
DS201911-2554
2019
Rocca, M.Presser, J.L.B., Alonso, R., Rocca, M.Malvinas Islands ( Falkland Islands): advances in the inferred buried marine impact mega-structure.Pyroclastic Flow Journal of Geology, Vol. 9, no. 1, pp. 1-14. pdf.Antarcticaimpact structure

Abstract: In 1992 Rampino noticed a large, almost circular negative gravity anomaly (~30 mGal) on the Falkland Plateau to the WNW of Malvinas Islands/Falkland Islands using satellite data then available, and speculated that it might be associated with a large (~250 km wide?) buried impact structure. In some more recent compilations Rocca & Presser (2015) and Rocca et al. (2017) was attended the Malvinas Islands/Falkland Islands “buried impact structure” with particular care; but also these works was harshly criticized. The present text, which is an advance to demonstrate the certain possibilities that this Malvinas Islands/Falklnad Islands It could really be a very probable mega impact structure, gathers shows and evaluates the existing and available indirect information; like gravimetry (Isostasy, Free-air and Bouguer); seismic reflection (Geco Prakla); and, even commenting aspects of its magnetic behavior and its local geology. In all gravimetric analyses from the Malvinas Islands/Falklnad Islands “buried impact structure” it can be shown that an annulus of positive gravity anomaly surrounding a circular oval depression of negative (isostasy and Free-air)/much lower (Bouguer) values gravity anomaly. The most relevant gravimetric information would be the near circular to oval Bouguer gravity low anomaly (with a minimum value of ~150 mGal) surrounded by at least circular ~255 kilometers wide circular ring of positive gravity anomaly (maximum ~225 mGal); a very high values of Bouguer anomaly that are highly compatible with what is expected to be found in mega impact structures. The Malvinas probable impact structure shows almost 100 mGal superior to the volcanic complex of Iceland; so it seems obvious that Malvinas probable impact structure moves away from a speculation by mega-paleo-volcano origin. When gravimetrically modeled, a probable peak ring of ~255 km is evidenced; as well as, the inferred the ~550 km probable rim-crest; configuration that reproduces an almost perfect and symmetrical modeling of a very probable giant impact structure with its clear visible the very probable elements: rim crest-annulus basin-peak ring-central basin-peak ring-annulus basin-rim crest. Four Geco Prakla seismic reflection lines on the area located to the SW of the potential peak ring show a vertical and disturbed crystalline basement (the “peak ring”); in three of them, the “central basin” what would it be filled with sediments after impact (probable ejecta). Using the empirical formula of Assumpção et al. (2013) calculation for crustal thickness could be found very clearly strong CT distortion along Malvinas very probable giant impact structure: around 3400-4000 meters; as is to be expected in terrestrial mega impact structure. Harness the EMAG2v3 a global Earth Magnetic Anomaly Grid compiled from satellite (Meyer et al., 2017) for the Malvinas very probable giant impact structure a well superior anomaly was found and better definition than observed, using the same information, to the one characterized by the impact crater Chicxulub. The geological map of the Falkland Islands Government that was placed ontop of the modeling isostasy gravimetric map where the approximate circumference of the very probable peak-ring and the very probable rim-crest is highlighted. This information allows to see that the largest island (West Malvinas) would be part of the very probable peak-ring and the smaller island (East Malvinas) would be part of the very probable rim-crest; both separated by the depression that would correspond to the very probable annulus basin. Based on what was analyzed in the Malvinas Islands area, we concluded the Malvinas exhibited geophysics traits of a large ancient asteroid impact; i.e. Malvinas very probable giant impact structure. Very probable impact structure what could be among one of the world's largest impact crater.
DS201710-2257
2017
Rocca, M.C.L.Presser, J.L.B., Tondo, M.J., Dolsa, S.F., Rocca, M.C.L., Alonso, R.N., Benetiz, P., Larroza, F.A., Duarte, B.J.R., Cabral-Antunez, N.D.Brief comments on the impact metamorphism in Cerro Leon quartzites, western Paraguay. English abstract ** in PORTPyroclastic Flow, Vol. 7, 1,pp. 16-24.South America, Paraguayimpact diamonds

Abstract: The petrographic study of two samples (quartzite and impactite) of Cerro León, a mountain range located in the middle of very probable impact basins (Cerro Leon-1, 2, 3 and 4-department of Alto Paraguay, Western-Paraguay) indicated evidences of impact metamorphism: PDFs (Not decorated and decorated) and diaplectic glass. Associated with diaplectic glass, impact diamonds or diamond/lonsdaleite crystals (micro and small macros) were observed with a range of morphologies including isolated and mostly agglutinated crystal varieties. Impact diamonds estimated to have formed by carbonate impact metamorphism present in the sedimentary target-rock of the Silurian/Devonian age. The identification of elements that reveal the impact metamorphism, in the analyzed samples of the Cerro León, evidences that the area of occurrence that would have been indicated as Very Probable Impact Basin, would be more of an Impact Basin.
DS201802-0259
2017
Rocca, M.C.L.Presser, J.L.B., Alonso, R.N., Farina Dolsa, S., Larroza, F.A., Rocca, M.C.L., Hornes, K., Baller, L.Impact metamorphism evidence of Negla and Yasuka Renda large impact crater. ***PORT only abstract in eng Boletin Museum History Natural Paraguay ***IN PORT, Vol. 21, no. 2, pp. 69-82. pdfSouth America, Paraguayimpact craters
DS1991-0250
1991
Rocci, G.Chabane, A., El Boukhari, A., Rocci, G., Tane, J.L.Discovery of Island Arc magmatics of boninitic affinity related to Pan-African ophiolite of Khzama(Siroua, Anti-Atlas, Morocco).(in French)Comptes Rendus de l'Academie des Sciences series II, (in French), Vol. 313, No. 11 November 21, pp. 1301-1304MoroccoOphiolites, Magma
DS1991-1439
1991
Rocci, G.Rocci, G., Deschamps, M.Conference report on the 15th, Colloquium on African GeologyEpisodes, Vol. 14, No. 1, March p. 73-74AfricaCraton, Tectonics
DS201212-0592
2012
Rocco, I.Rocco, I., Lustrino, M., Zanetti, A., Morra, V., Melluso, L.Petrology of ultramafic xenoliths in Cenozoic alkaline rocks of northern Madagascar ( Nosy Be Archipelago)Journal of South American Earth Sciences, in press availableAfrica, MadagascarBasanites, Foidites
DS201312-0748
2013
Rocco, I.Rocco, I., Lustino, M., Zanetti, A., Morra, V., Melluso, L.Petrology of ultramafic xenoliths in Cenozoic alkaline rocks of northern Madagascar. Nosy Be Journal of South American Earth Sciences, Vol. 41, pp. 122-139.Africa, MadagascarBasanites, Foidites
DS201708-1580
2017
Rocco, I.Rocco, I., Zanetti, A., Melluso, L., Morra, V.Ancient depleted and enriched mantle lithosphere domains in northern Madagascar: geochemical and isotopic evidence from spinel-to-plagioclase-bearing ultramafic xenoliths. Massif d'Ambre and BobaombyChemical Geology, in press available, 16p.Africa, Madagascarmelting

Abstract: Mantle xenoliths hosted in Cenozoic alkaline rocks of northern Madagascar (Massif d'Ambre and Bobaomby volcanic fields) are spinel lherzolites, harzburgites and rare websterites. Petrography, electron microprobe, LA-ICP-MS and thermal ionization mass spectrometry techniques allowed to recognize domains characterized by variable degree of partial melting and extent of re-enrichment processes: 1) refractory spinel-to-spinel + plagioclase-lherzolites, with clinopyroxenes having marked LREE (Light Rare Earth Elements) depletion ((La/Yb)N ~ 0.2) and very high 143Nd/144Nd (0.513594), which represent a limited and shallow portion of old mantle that suffered low degree partial melting (2–3%) and was later accreted to the lithosphere. These lherzolites acted as a low-porosity region, being, in places, percolated by small volumes of melts shortly before eruption; 2) lherzolites and harzburgites that suffered variable degrees of partial melt extraction (up to 15%), assisted and/or followed by pervasive, porous flow infiltration of alkaline melts in a relatively large porosity region, leading to the creation of a wide area rich in secondary mineral phases (i.e. olivine, clinopyroxene and pargasitic amphibole), enriched in incompatible elements (e.g., LaN/YbN in clinopyroxene up to 15) and having radiogenic Sr and unradiogenic Nd; 3) websterites and wehrlite-bearing samples that record differentiation processes of alkaline melts highly enriched in Th, U and LREE, not yet documented in the erupted volcanics of northern Madagascar. The mantle xenoliths of northern Madagascar show a regional decrease of the equilibration temperature from to SW (up to 1180 °C, Nosy Be Archipelago) to the NE (up to 900 °C, Bobaomby district). A significant lithologic and geochemical variation of the shallow lithospheric mantle beneath northern Madagascar is noted, in contrast with the relatively uniform geochemical and isotopic composition of the host alkali basalt and basanite lavas.
DS2001-0981
2001
Rocha, E.B.Rocha, E.B., Nasraqui, M., Soubies, BilalGeochemical evolution of pyrochlore during supergene alteration of CatalaoII ore deposits.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 29.(abs)BrazilCarbonatite, Catalao II
DS1995-0211
1995
Rocha, J.Bristow, J., Moloi, N., Solomon, M., Rocha, J.Minerals and mining in South Africa: past, present and futureProspectors and Developers Association of Canada (PDAC) Reprint, 8pSouth AfricaEconomics, Mining industry, legal
DS1997-0962
1997
Rocha, J.Rocha, J., Bristow, J.Mine downscaling and closure: an integral part of sustainable developmentJournal of Mineral Policy, Business and Environment, Vol. 12, No. 4, pp. 15-20Ontario, South AfricaEnvironment, closures, Deposit - Sudbury, Kimberley
DS1997-0963
1997
Rocha, J.Rocha, J., Bristow, J.Mine downscaling and closure: an integral part of sustainable developmentJournal of Mineral Policy, Business and Environment, Vol. 12, No. 4, pp. 15-20.South AfricaClosures, downscaling, economics, Deposit - Kimberley area
DS200412-0069
2004
Rocha, M.Assumpcao, M., Schimmel, M., Escalante, C., Barbosa, J.R., Rocha, M., Barros, L.V.Intraplate seismicity in SE Brazil: stress concentration in lithospheric thin spots.Geophysical Journal International, Vol. 159, 1, pp. 390-399.South America, BrazilGeophysics - seismics
DS200812-0530
2008
Rocha, M.P.Julia, J., Assumpcao, M., Rocha, M.P.Deep crustal structure of the Parana Basin from receiver functions and Rayleigh wave dispersion: evidence for a fragmented cratonic root.Journal of Geophysical Research, Vol. 113, B8318.South America, BrazilGeophysics - seismics
DS202007-1171
2020
Rocha, M.P.Portner, D.E., Rodriguez, E.E., Beck, S., Zandt, G., Scire, A., Rocha, M.P.Detailed structure of the subducted Nazca slab into the lower mantle derived from continent scale teleseismic P wave tomography.Journal of Geophysical Research: Solid Earth, Vol. 125, e2019JB017884.Mantle, South Americasubduction

Abstract: Nazca subduction beneath South America is one of our best modern examples of long-lived ocean-continent subduction on the planet, serving as a foundation for our understanding of subduction processes. Within that framework, persistent heterogeneities at a range of scales in both the South America and Nazca plates is difficult to reconcile without detailed knowledge of the subducted Nazca slab structure. Here we use teleseismic travel time residuals from >1,000 broadband and short-period seismic stations across South America in a single tomographic inversion to produce the highest-resolution contiguous P wave tomography model of the subducting slab and surrounding mantle beneath South America to date. Our model reveals a continuous trench-parallel fast seismic velocity anomaly across the majority of South America that is consistent with the subducting Nazca slab. The imaged anomaly indicates a number of robust features of the subducted slab, including variable slab dip, extensive lower mantle penetration, slab stagnation in the lower mantle, and variable slab amplitude, that are incorporated into a new, comprehensive model of the geometry of the Nazca slab surface to ~1,100 km depth. Lower mantle slab penetration along the entire margin suggests that lower mantle slab anchoring is insufficient to explain along strike upper plate variability while slab stagnation in the lower mantle indicates that the 1,000 km discontinuity is dominant beneath South America.
DS200512-0492
2005
Rocha Barbosa, E.S.Junqueira-Brod, T.C., Gaspar, J-C., Brod, J.A., Jost, H., Rocha Barbosa, E.S., Kafino, C.V.Emplacement of kamafugitic lavas from the Goais alkaline province, Brazil: constraints from whole rock simulations. (mafurite, ugandite)Journal of South American Earth Sciences, Vol. 18, 3-4, March pp. 323-335.South America, BrazilSanto Antonio da Barra, Aguas Emendadas, carbonatite
DS1989-0360
1989
Rochal, S.B.Dmitriev, V.P., Rochal, S.B., Gufan, Y.M., Toledano, P.Reconstructive transitions between ordered phases -the Martensitic FCC-HCP and the graphite diamondtransitionsPhys. Rev. L., Vol. 62, No. 2, May 22, pp. 2495-2498GlobalDiamond morphology, Graphite-diamond
DS201412-0746
2014
Rochas, L.G.de M.Rochas, L.G.de M., Pires, A.C.B., Carmelo, A.C., Filhio, J.O.de A.Geophysical characterization of the Azimuth 125 lineamnet with aeromagnetic data: contributions to the geology of central Brazil.Precambrian Research, Vol. 249, pp. 273-287.South America, BrazilGeophysics - aeromagnetics
DS201701-0027
2016
Rochat, L.Pilet, S., Abe, N., Rochat, L., Kaczmarek, M-A., Hirano. N., Machida, S., Buchs, D.M., Baumgartner, P.O., Muntener, O.Pre-subduction metasomatic enrichment of the oceanic lithosphere induced by plate flexure.Nature Geoscience, Vol. 9, pp. 898-903.MantleSubduction

Abstract: Oceanic lithospheric mantle is generally interpreted as depleted mantle residue after mid-ocean ridge basalt extraction. Several models have suggested that metasomatic processes can refertilize portions of the lithospheric mantle before subduction. Here, we report mantle xenocrysts and xenoliths in petit-spot lavas that provide direct evidence that the lower oceanic lithosphere is affected by metasomatic processes. We find a chemical similarity between clinopyroxene observed in petit-spot mantle xenoliths and clinopyroxene from melt-metasomatized garnet or spinel peridotites, which are sampled by kimberlites and intracontinental basalts respectively. We suggest that extensional stresses in oceanic lithosphere, such as plate bending in front of subduction zones, allow low-degree melts from the seismic low-velocity zone to percolate, interact and weaken the oceanic lithospheric mantle. Thus, metasomatism is not limited to mantle upwelling zones such as mid-ocean ridges or mantle plumes, but could be initiated by tectonic processes. Since plate flexure is a global mechanism in subduction zones, a significant portion of oceanic lithospheric mantle is likely to be metasomatized. Recycling of metasomatic domains into the convecting mantle is fundamental to understanding the generation of small-scale mantle isotopic and volatile heterogeneities sampled by oceanic island and mid-ocean ridge basalts.
DS1997-0060
1997
Rochat, P.Baby, P., Rochat, P., Mascle, G., Herail, G.Neogene shortening contribution to crustal thickening in the back arc Of the Central AndesGeology, Vol. 25, No. 10, Oct., pp. 883-886Bolivia, AndesThrust systems, Tectonics, geophysics
DS2001-0982
2001
Roche, O.Roche, O.Onset of caldera collapse during ignimbrite eruptionsEarth and Planetary Science Letters, Vol. 191, No. 3-4, pp. 191-202.GlobalPetrology - ignimbrites, volcanism.
DS1996-1198
1996
Rochell, A.Rochell, A., Heusser, E., Kirsten, T., Oehm, J., RichterA noble gas profile across a Hawaiian mantle xenolith: coexisting accidental and cognate noble gases derivedGeochimica et Cosmochimica Acta, Vol. 60, No. 23, pp. 4773-83.Mantle, HawaiiGeochemistry - ultramafic xenoliths, Geochronology
DS1860-1066
1899
Rochester Democrat ChronicleRochester Democrat ChronicleDiamond Found in the Lake Region With Valuable Gem DiscussioRochester Democrat Chronicle., JULY 3RD.United States, Great Lakes, WisconsinDiamond Occurrence
DS201312-0724
2013
Rochette, P.Quesnel, Y., Gattacceca, J., Osinski, G.R., Rochette, P.Origin of the central magnetic anomaly at the Haughton impact structure, Canada.Earth and Planetary Science Letters, Vol. 368, pp. 116-122.CanadaImpacts
DS201412-0255
2014
Rochette, P.Friedman, S.A., Feinberg, J.M., Ferre, E.C., Demory, F., Martin-Hernandez, F., Condor, J.A., Rochette, P.Craton vs rift uppermost mantle contributions to magnetic anomalies in the United States interior.Tectonophysics, Tecto9071R.docxUnited States, Montana, Colorado PlateauGeophysics - magnetics
DS2003-1490
2003
Rocholl, A.Wirth, R., Rocholl, A.Nanocrystalline diamond from the Earth's mantle underneath HawaiiEarth and Planetary Science Letters, Vol. 211, 3-4, June 30, pp. 357-69.HawaiiMetasomatism, Salt Lake Crater
DS2003-1491
2003
Rocholl, A.Wirth, R., Rocholl, A.Nanocrystalline diamond from the Earth's mantle underneath HawaiiEarth and Planetary Science Letters, Vol. 211, 3-4, pp. 357-69.HawaiiBlank
DS200412-2137
2003
Rocholl, A.Wirth, R., Rocholl, A.Nanocrystalline diamond from the Earth's mantle underneath Hawaii.Earth and Planetary Science Letters, Vol. 211, 3-4, June 30, pp. 357-69.United States, HawaiiMetasomatism, Salt Lake Crater
DS201809-2057
2018
Rocholl, A.Lian, D., Yang, J., Wiedenbeck, M., Dilek, Y., Rocholl, A., Wu, W.Carbon and nitrogen isotope, and mineral inclusion studies on the diamonds from the Pozanti-Karsanti chromitite, Turkey. MicrodiamondsContributions to Mineralogy and Petrology, doi.org:10.1007/ s00410-018-1499-5 19p.Europe, Turkeydiamond inclusions

Abstract: The Pozanti-Karsanti ophiolite (PKO) is one of the largest oceanic remnants in the Tauride belt, Turkey. Micro-diamonds were recovered from the podiform chromitites, and these diamonds were investigated based on morphology, color, cathodoluminescence, nitrogen content, carbon and nitrogen isotopes, internal structure and inclusions. The diamonds recovered from the PKO are mainly mixed-habit diamonds with sectors of different brightness under the cathodoluminescence images. The total d13C range of the PKO diamonds varies between - 18.8 and - 28.4‰, with a principle d13C mode at - 25‰. Nitrogen contents of the diamonds range from 7 to 541 ppm with a mean value of 171 ppm, and the d15N values range from - 19.1 to 16.6‰, with a d15N mode of - 9‰. Stacking faults and partial dislocations are commonly observed in the Transmission Electron Microscopy foils whereas inclusions are rather rare. Combinations of ( Ca0.81Mn0.19)SiO3, NiMnCo-alloy and nanosized, quenched fluid phases were observed as inclusions in the PKO diamonds. We believe that the 13C-depleted carbon signature of the PKO diamonds derived from previously subducted crustal matter. These diamonds may have crystallized from C-saturated fluids in the asthenospheric mantle at depth below 250 km which were subsequently carried rapidly upward by asthenospheric melts.
DS201909-2095
2019
Rocholl, A.Thakurdin, Y., Bolhar, R., Horvath, P., Wiedenbeck, M., Rocholl, A.Formation of lower to middle crust of the Wyoming craton, Montana, USA, using evidence from zircon Hf-O isotopic and trace element compositions.Chemical Geology, Vol. 525, pp. 218-244.United States, Montanacraton - Wyoming

Abstract: Coupled oxygen-hafnium isotope and trace element geochemical data were obtained using thirty eight previously dated zircon grains extracted from five mafic to intermediate crustal xenoliths of the Wyoming Craton (Montana, USA). Xenoliths include mid to lower crustal (642-817?°C and 3.5-9.4?kbar) mafic granulites and amphibolites with dominantly Mesoproterozoic (1772-1874?Ma) and minor Paleoproterozoic to Late Archean (2004-2534?Ma) 207Pb/206Pb zircon ages. Zircon oxygen isotope data indicate derivation from melts in equilibrium with a mantle source that interacted with limited supracrustal material (d18O?=?4.4-5.7‰), as well as the incorporation of supracrustal fluids or melts into mantle source regions (d18O?=?6.0-8.1‰). The small within-sample isotopic variability suggests that primary zircon did not exchange with isotopically distinct fluids or melts after initial formation. Initial zircon Hf isotopic values are highly variable across all xenoliths (eHf?=?+3.7 to -17.6), consistent with protolith derivation from mantle sources that incorporated evolved, unradiogenic material or were modified by subduction-related fluids. Within a single granulite xenolith, two zircon types are recognized based on CL imagery, Hf isotopes and U-Pb ages (Type I and Type II). Type I magmatic zircons show dispersed ages (ca. 1700-2534?Ma) and unradiogenic initial Hf (eHf?=?-17.6 to -1.5, 176Hf/177Hf?=?0.281074-0.281232). The spread in ages and initial eHf, but narrow range in initial 176Hf/177Hf, points to variable Pb loss in response to dissolution-recrystallization of pre-existing zircon. Type II metamorphic zircon yields a younger Proterozoic population (ca. 1700-2155?Ma) with more radiogenic initial Hf relative to Type I zircon (eHf?=?-7.9 to +1.4, 176Hf/177Hf?=?0.281427-0.281578); this type represents newly grown metamorphic zircon that formed in the solid-state and incorporated Zr and Hf from pre-existing zircon and silicate matrix/metamorphic phases. REE patterns from all xenoliths are steep and positively sloping without discernible HREE depletion relative to LREE, implying zircon crystallization/recrystallization in the absence of garnet. Negative Eu anomalies signify simultaneous zircon and feldspar crystallization. Solid-state recrystallization may have lead to variations in LREE, Eu and Ce in certain xenoliths. Xenoliths containing magmatic zircon (1834?±?19?Ma) with mantle-like d18O (4.4-5.5‰) and radiogenic initial eHf (-2.3 to +3.7) likely formed through crystallization of melts derived from a mantle source that incorporated minor amounts of subducted sedimentary/supracrustal material. Proterozoic (1874?±?8?Ma) xenoliths with elevated d18O (6.0-7.0‰) and unradiogenic initial eHf (-8.2 to -9.6) within magmatic zircon represent melt products of subduction-induced melting and metasomatism of the overlying mantle wedge in the vicinity of the northern GFTZ. Older (ca. 2534?Ma) xenoliths containing zircons with elevated d18O (6.4-7.2‰) and unradiogenic eHf (up to -17.6) represent crystallization of protolith magmas extracted from a mantle source metasomatized by subduction-derived fluids and melts in the Late Archean or earlier. Zircon geochronology and isotope systematics within Mesoproterozoic xenoliths support a model of ocean-closure and subsequent continental collision between the Medicine Hat Block and Wyoming Craton, resulting in the formation of subduction-related melts at ca. 1834-1874?Ma, followed by ca. 1770?Ma collision-related metamorphism thereafter.
DS1990-1239
1990
Rock, N.Rock, N., Brown, T., Hattie, J.Geological statistics on the Apple Macintosh. Overview and brief assessment of programs availableTerra Nova, Vol. 2, No. 1, pp. 93-100GlobalComputers, Macintosh programs
DS1991-1440
1991
Rock, N.Rock, N.Better reports with less effort -power word processing on the MacintoshGeobyte, Vol. 6, No. 2, pp. 19-30GlobalComputer, Programs -word processing -reports
DS1991-1850
1991
Rock, N.Wheatly, M., Rock, N.Macintosh decoder and retrieval program for the international igneous rockdat a base IGBA.Episodes, Vol. 14, No. 4 December pp. 313-326GlobalComputer, Program -Database igneous rocks
DS1991-1851
1991
Rock, N.Wheatly, M., Rock, N.Macintosh decoder and retreival program for the international igneous rockdat a base IGBA.Episodes, Vol. 14, No. 4, December pp. 313-326GlobalComputer, Program -Igneous rocks database incl. kimberlites
DS1995-1890
1995
Rock, N.Taylor, W.R., Page, R.W., Esslemont, G., Rock, N., ChalmersGeology of the volcanic hosted Brockman rare metals deposit: volcanicenvironment, geochronology, petrographyMineralogy and Petrology, Vol. 52, No. 3-4, pp. 209-230.AustraliaHalls Creek Mobile Zone, rare earth, Deposit -Brockman
DS1995-1891
1995
Rock, N.Taylor, W.R., Page, R.W., Esslemont, G., Rock, N., ChalmersGeology of the volcanic hosted Brockman rare metals deposit, Halls Creek Mobile Zone: environmentMineralogy and Petrology, Vol. 52, No. 3-4, pp. 209-230AustraliaRare earths, geochronology, petrography, Volcanics, Deposit -Brockman
DS1981-0352
1981
Rock, N.M.S.Rock, N.M.S.How Should Igneous Rocks Be Grouped?Geology Magazine, Vol. 118, No. 5, PP. 449-579.GlobalBreccia
DS1982-0524
1982
Rock, N.M.S.Rock, N.M.S.Chemical mineralogy of the monchiquite alkaline complex,SouthernPortugalContributions to Mineralogy and Petrology, Vol. 81, No. 1, pp. 64-78GlobalAlkaline Rocks
DS1983-0540
1983
Rock, N.M.S.Rock, N.M.S.The Prmo-carboniferous Camptonite-monchiquite Dyke Suite Of the Scottish Highlands and Islands; Distribution, Field And petrological Aspects.Natural Environment Research Council, Institute Geol. Studies (g, Vol. 82-14, 36P.ScotlandPetrology, Lamprophyres, Carbonatite
DS1984-0292
1984
Rock, N.M.S.Garson, M.S., Coats, J.S., Rock, N.M.S., Deans, T.Fenites, Breccia Dykes, Albitites and Carbonatitic Veins Near the Great Glen Fault, Inverness, Scotland.Journal of the Geological Society of London., Vol. 141, PP. 711-732.ScotlandRelated Rocks
DS1984-0611
1984
Rock, N.M.S.Rock, N.M.S.Nature and Origin of Calc Alkaline Lamprophyres: Minettes, Vogesites, Kersantites and Spessartites.Royal Society. EDINBURGH Transactions, Vol. 74, PT. 4, PP. 193-228.GlobalRelated Rocks, Classification
DS1985-0562
1985
Rock, N.M.S.Rock, N.M.S.The Nature and Origin of Lamprophyres: an OverviewConference Report On The Meeting of The Volcanic Studies Gro, 30P. 10 FIGURES, 12 TABLESGlobalMinettes, Lamproites, Orendites, Nomenclature, Classification
DS1985-0563
1985
Rock, N.M.S.Rock, N.M.S.The Nature and Origin of Ultramafic Lamprophyres: Alnoites And Allied Rocks.In Press Submitted To Journal of Petrology, 27P. 7 FIGURES, 15 TABLESGlobalRock Definition, Classification, Characteristics, Lamprophyres
DS1985-0564
1985
Rock, N.M.S.Rock, N.M.S.Regional Late Caledonian Lamprophyric Dyke Swarms of Southern Scotland.Geological Association of Canada (GAC)., Vol. 10, P. A 52, (abstract.).ScotlandTectonics
DS1986-0053
1986
Rock, N.M.S.Barnes, R.P., Rock, N.M.S., Gaskarth, J.W.Late Caledonian dike swarms in southern Scotland: new field.Petrological and geological dat a for the Wigtown Peninsula,GallowayGeol. Journal, Vol. 21, No. 2, April-June pp. 101-126ScotlandBlank
DS1986-0675
1986
Rock, N.M.S.Rock, N.M.S.The nature and origin of ultramafic lamprophyres: alnoites andalliedrocksJournal of Petrology, Vol. 27, pt. 1, pp. 155-196GlobalAlkaline rocks, Alnoite
DS1986-0676
1986
Rock, N.M.S.Rock, N.M.S.Kimberlite as a variety of lamprophyreProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 84-86GlobalClassification
DS1986-0677
1986
Rock, N.M.S.Rock, N.M.S., Gaskarth, J.H., Rundle, C.C.Late Caledonian dyke swarms in southern Scotland- a regional zone of primitive K rich lamprophyres abd associated ventsJournal of Geology, Vol. 94, No. 4, July pp. 505-522ScotlandDyke
DS1987-0260
1987
Rock, N.M.S.Groves, D.I., Ho, S.E., Rock, N.M.S., Barley, M.E., Muggeridge, M.T.Archean cratonsGeology, Vol. 15, No. 9, September pp. 801-805Canada, Wyoming, Southern Africa, Zimbabwe, Russia, AustraliaTectonics, Craton
DS1987-0614
1987
Rock, N.M.S.Rock, N.M.S.A global dat abase of analytical dat a for alkaline syenitoid, trachytoid and phonolitoid rocksModern Geology, Vol. 11, pp. 51-67GlobalClassification, Carbonatite
DS1988-0216
1988
Rock, N.M.S.Finlayson, E.J., Rock, N.M.S., Golding, S.D.Deformation and regional carbonate metasomatism of turbidite hosted Cretaceous alkaline lamprophyres (northwest Papua New Guinea)Chemical Geology, Vol. 69, No. 3-4, pp. 215-233Papua New GuineaCamptonite, Lamprophyres
DS1988-0576
1988
Rock, N.M.S.Rock, N.M.S.Which rocks really contain diamonds?Ninth Australian Geol. Convention, Geological Society of Australia Publishing, Held Feb., No. 12, abstract volume, pp. 338-339Australia, United States, Zambia, IndiaLamproite
DS1988-0577
1988
Rock, N.M.S.Rock, N.M.S., Carroll, G.W.A simple program for teaching igneous rock nomenclatureThe Compass, Vol. 66, No. 1, Fall pp. 18-24. Database #18061GlobalComputer, Program -Igneous rock quiz
DS1988-0578
1988
Rock, N.M.S.Rock, N.M.S., Gaskarth, J.W., Henney, P.J., Shand, P.Late Caledonian dyke swarms of northern Britain: some preliminary petrogeneic and tectonic implications of their province wide distribution andchemicCanadian Mineralogist, Vol. 26, No. 1, March pp. 3-22GlobalBlank
DS1988-0579
1988
Rock, N.M.S.Rock, N.M.S., Groves, D.I.Do lamprophyres carry gold as well as diamonds?Nature, Vol. 332, No. 6161, March 17, pp. 253-256GlobalBlank
DS1989-1199
1989
Rock, N.M.S.Perring, C.S., Rock, N.M.S., Golding, S.D., Roberts, D.E.Criteria for the recognition of metamorphosed or altered lamprophyres: acase study from the Archean of Kambalda Western AustraliaPrecambrian Research, Vol. 43, nol 2, pp. 215-237AustraliaCanada, Zimbabwe, Tanzania, Classification -Lamprophy, Geochemistry
DS1989-1287
1989
Rock, N.M.S.Rock, N.M.S.Kimberlites as varieties of lamprophyres: implications for geologicalmapping, petrological research and mineral explorationGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 46-59AustraliaLamprophyres, Geochemistry
DS1989-1288
1989
Rock, N.M.S.Rock, N.M.S.CIPW: a terminal-interactive FORTRAN 77 program for tabulating extended CIPW norms from large batches of analysesCogs Computer Contribution, Vol. 5, No. 1, March pp. 17-41GlobalComputer program, Program - CIPW, Lamproites, alnoites
DS1989-1289
1989
Rock, N.M.S.Rock, N.M.S., Paul, D.K.Lamprophyres, lamproites and kimberlites in India: a bibliography and preliminary reappraisalMemoirs of the Geological Society of India, No. 15, pp. 291-311IndiaLamproite, Bibliography, overview
DS1989-1290
1989
Rock, N.M.S.Rock, N.M.S., Wheatley, M.R.Computers in mineral exploration: establishing aknowledge base in The search for diamondsMinpet 89 Mineralogy And Petrology Symposium Held Sydney, February, p. 15-24. AbstractAustraliaComputer Program, Exploration data
DS1989-1291
1989
Rock, N.M.S.Rock, N.M.S., Wheatly, M.R.Some experiences with integrating the use of mainframes and microsComputers and Geosciences, Vol. 15, No. 6, pp. 997-1002GlobalComputer, Mainframes and micros
DS1989-1612
1989
Rock, N.M.S.Wheatley, M.R., Rock, N.M.S.Reviews: Six database management systems for the MacintoshGeobyte, Vol. 4, No. 6, December pp. 49-56GlobalComputer, Management systems -Macintosh
DS1990-0401
1990
Rock, N.M.S.Dessai, A.G., Rock, N.M.S., Griffin, B.J., Gupta, D.Mineralogy and petrology of some xenolith bearing alkaline dykes associated with Deccan magmatism, south of Bombay IndiaEuropean Journal of Mineralogy, Vol. 2, No. 5, pp. 667-686IndiaAlkaline dykes, alkaline rocks, Xenoliths
DS1990-0642
1990
Rock, N.M.S.Hamilton, R., Rock, N.M.S.Geochemistry, mineralogy and petrology of a new find of lamprophyres from Bulletinjah Pool, Nabberu Basin, Yilgarn Craton, Western AustraliaLithos, Vol. 24, No. 4, August pp. 275-290AustraliaLamprophyres, Bulletinjah Pool
DS1990-0643
1990
Rock, N.M.S.Hamilton, R., Rock, N.M.S.Geochemistry, mineralogy and petrology of a new find of ultramafic lamprophyres from Bulletinjah Pool, Nabberu Basin, Yilgarn Craton, WesternAustraliaLithos, Vol. 24, No. 4, August pp. 275-290AustraliaLamprophyres, Geochemistry
DS1990-1211
1990
Rock, N.M.S.Ramsay, R.R., Rock, N.M.S.Comparative garnet, pyroxene, chromite and magnesium-ilmenite xenocryst compositions in selected kimberlitic sources and their relevance to diamondexplorationGeological Society of Australia Abstracts, No. 25, No. A12.11 pp. 243-244. AbstractAustraliaMantle nodules, Garnet analyses -Xenocrys
DS1990-1240
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyric dike swarms and pipes in western Australia: an updatedsummaryMafic dykes and emplacement mechanisms, Editors A.J. Parker, P.C., pp. 201-208AustraliaLamprophyres, Summary
DS1990-1241
1990
Rock, N.M.S.Rock, N.M.S.IMA pyroxene nomenclature scheme: computerization and its consequencesMin. Pet., Vol. 43, pp. 99-119.GlobalClassification - pyroxene
DS1990-1242
1990
Rock, N.M.S.Rock, N.M.S.What are lamprophyres? history, definitions, classificationVan Nostrand Reinhold, Chapter 1 pp. 1-17GlobalLamprophyres, Classification
DS1990-1243
1990
Rock, N.M.S.Rock, N.M.S.LamprophyresBlackie and Son. Publishing Van Nostrand Reinhold in Canada and USA, 288pGlobalLamprophyres, Classification, gold, diamo
DS1990-1244
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyres - economic geologyVan Nostrand Reinhold, Chapter 9, pp. 150-156GlobalLamprophyres, Diamond content
DS1990-1245
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyres - when and where? global distribution, igneous associationsVan Nostrand Reinhold, Chapter 2 pp. 19-33GlobalLamprophyres, Distribution
DS1990-1246
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyres - whole rock geochemistryVan Nostrand Reinhold, Chapter 5 pp. 77-101GlobalLamprophyres, Geochemistry
DS1990-1247
1990
Rock, N.M.S.Rock, N.M.S.Nature, origin and evolution of lamprophyre meltsVan Nostrand Reinhold, Chapter 8, pp. 125-149GlobalLamprophyres, Magma genesis
DS1990-1248
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyres - cognate mineralogyVan Nostrand Reinhold, Chapter 4 pp. 47-76GlobalLamprophyres, Mineralogy
DS1990-1249
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyres - field geology and petrography -macroscopy and microscopyVan Nostrand Reinhold, Chapter 3 pp. 34-46GlobalLamprophyres, Petrography
DS1990-1250
1990
Rock, N.M.S.Rock, N.M.S.Lamprophyres - inclusion suites -macrocrysts, xenocrysts, xenoliths etcVan Nostrand Reinhold, Chapter 6, pp. 103-112GlobalLamprophyres, Xenocrysts, nodules
DS1990-1251
1990
Rock, N.M.S.Rock, N.M.S., Wright, A.E., Bowes, D.R.Lamprophyres - plutonic and volcanic equivalents of lamprophyresVan Nostrand Reinhold, Chapter 7 pp. 113-124GlobalLamprophyres (melilitolites, ankaratrites, katungites, Appinite, vaugnerite, calc-alkaline, minette, melilitites
DS1990-1562
1990
Rock, N.M.S.Williams, K.L., Rock, N.M.S., Carroll, G.W.SPINEL and SPINELTAB: Macintosh programs to plot spinel analyses in the three dimensional oxidized (magnetite) and reduced (ulvospinel) prismsAmerican Mineralogist, Vol. 75, No. 11-12, November-December pp. 1428-1430GlobalComputer Program, SPINEL
DS1991-0367
1991
Rock, N.M.S.Delor, C.P., Rock, N.M.S.Alkaline-ultramafic lamprophyre dykes from the Vestfold Hills, Princess Elizabeth Land (East Antarctica) -primitive magmas of deep mantle originAntarctic Science, Vol. 3, No. 4, December pp. 419-432. # GR092AntarcticaAlkaline, Lamprophyre dykes
DS1991-0424
1991
Rock, N.M.S.Edwards, D., Rock, N.M.S., Taylor, W.R., Griffin, B.J., Sun, S-S.The Aries Diamondiferous kimberlite pipe, central Kimberley block, westernAustralia: mineralogy, petrology and geochem. of the pipe rock and indicatorsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 82-84AustraliaMicaceous kimberlite, Group II, Geochemistry
DS1991-0504
1991
Rock, N.M.S.Foster, J.G., Hamilton, R., Rock, N.M.S.The mineralogy, petrology and geochemistry of ultramafic lamprophyres Of the Yilgarn craton, western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 112-115AustraliaGeochronology, Mineralogy -cognate
DS1991-0606
1991
Rock, N.M.S.Griffin, B.J., Muhling, J.R., Carroll, G.W., Rock, N.M.S.RECALC2- a package for processing mineral analyses produced by electronmicroprobeAmerican Mineralogist, Vol. 76, No. 1-1, Jan-February pp. 295-299GlobalComputer Program, RECALC2- Microprobe
DS1991-0758
1991
Rock, N.M.S.Hwang, P., Rock, N.M.S., Taylor, W.R.Petrology, mineralogy, and geochemistry of the Metters Bore no. 1, lamproite pipe, west Kimberley Province, Western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 180-182AustraliaLamproite, Petrology
DS1991-1335
1991
Rock, N.M.S.Perring, C.S., Rock, N.M.S.Relationships between calc-alkaline acidic and basic (mantle derived)magmas in Late Archean composite dykes, Kambalda Goldfield, western AustraliaPrecambrian Research, Vol. 52, pp. 245-273AustraliaAlkaline magmas, Deposit -Kambalda Goldfield
DS1991-1441
1991
Rock, N.M.S.Rock, N.M.S.Progress in 1988-1990 with computer applications in the 'hard rock' arena:geochemistry, mineralogy, petrology and volcanologyComputers and Geosciences, Vol. 17, No. 8, pp. 1067-1090GlobalComputer, Program -hard rock applications
DS1991-1442
1991
Rock, N.M.S.Rock, N.M.S.Towards a comprehensive database of geoscience software: a Macintosh directory of published programsComputers and Geosciences, Vol. 17, No. 6, pp. 849-854GlobalComputers, Program -database of Macintosh programs
DS1991-1443
1991
Rock, N.M.S.Rock, N.M.S., Carroll, G.W., Wheatley, M.R., Williams, K.L.MacSuite: an integrated compendium of geoscientific programs for the AppleMacintoshAmerican Mineralogist, Vol. 76, No. 11, 12 November-December pp. 2013-2019GlobalComputer, Program -MacSuite igneous petrology
DS1991-1565
1991
Rock, N.M.S.Sheppard, S., Taylor, W.R., Rock, N.M.S.Barium-rich olivine mica lamprophyres with affinities to lamproites, From the Mt. Bundey area, Northern Territory, AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 364-366AustraliaLamproites, Mt. Bundey
DS1991-1698
1991
Rock, N.M.S.Taylor, L.A., Rock, N.M.S.Major element systematics of alkaline volcanic and lamprophyric rocks -toward a geochem. and petrogenetic class scheme potentially diamondiferous alkaline rocksProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 414-416GlobalLAMPA database major and trace elements, Alkaline volcanic and lamprophyric rocks
DS1992-0412
1992
Rock, N.M.S.Edwards, D., Rock, N.M.S., Taylor, W.R., Griffin, B.J.Mineralogy and petrology of the Aries Diamondiferous kimberlite pipe, central Kimberley block, western AustraliaJournal of Petrology, Vol. 33, No. 5, October pp. 1157-1191AustraliaKimberlite, Deposit -Aries
DS1992-0641
1992
Rock, N.M.S.Gwalani, L.C., Rock, N.M.S., Griffin, B.J.Alkaline rocks and carbonatites of Amba Dongar and adjacent areas, DeccanProvince, Gujarat India: mineralogy, petrology and geochemistryProceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 2, abstract p. 578IndiaCarbonatite
DS1992-1102
1992
Rock, N.M.S.Muller, D., Rock, N.M.S., Groves, D.I.Geochemical discrimination between shoshonitic and potassic volcanic Rocks in different tectonic settings: a pilot study.Mineralogy and Petrology, Vol. 46, No. 4, pp. 259-289.Andes, Alps, Mariana Trough, Sunda Arc, CordilleraGeochemistry, Shoshonites
DS1992-1285
1992
Rock, N.M.S.Rock, N.M.S., Griffin, B.J., Edgar, A.D., Paul, D.K., Hergt, J.M.A spectrum of potentially Diamondiferous lamproites and minettes from the Jharia coalfield eastern IndiaJournal of Volcanology and Geothermal Research, Vol. 50, No. 1/2, April 15, pp. 55-84IndiaLamproites, Jharia coalfield
DS1993-0607
1993
Rock, N.M.S.Gwalani, L.G., Rock, N.M.S., Chang, W.J., Fernandez, S., AllegreAlkaline rocks and carbonatites of Amba Dongar and adjacent areas, DeccanMineralogy and Petrology, Vol. 47, No. 2-4, pp. 219-254IndiaCarbonatite
DS1994-0798
1994
Rock, N.M.S.Hwang, P., Taylor, H.R., Rock, N.M.S., Ransay, R.R.Mineralogy, geochemistry and petrogenesis of the Metters bore no. 1lamproite pipe, Calwywyardah field.Mineralogy and Petrology, Vol. 51, No. 2-4, pp. 195-226.Australia, Western AustraliaLamproite, geochemistry, petrology, Deposit - Metters Bore No. 1, West Kimberley
DS1994-1437
1994
Rock, N.M.S.Ramsay, R.R., Edwards, D., Taylor, W.R., Rock, N.M.S., Griffin, B.J.Compositions of garnet, spinel Aries Diamondiferous kimberlite pipe, Kimberley Block, implications for explJournal of Geochem. Exploration, Vol. 51, No. 1, Apr. pp. 59-78.AustraliaGeochemistry, Deposit -Aries
DS1994-1473
1994
Rock, N.M.S.Rock, N.M.S., Gwalani, L.G., Griffin, B.J.Alkaline rocks and carbonatites of Amba Dongar and adjacent areas, Deccan alkaline Province, Gujarat India #2Mineralogy and Petrology, Vol. 51, No. 2-4, pp. 113-136.IndiaAlkaline rocks, Carbonatite
DS1994-1749
1994
Rock, N.M.S.Taylor, W.R., Rock, N.M.S., Groves, D.I., et al.Geochemistry of Archean shoshonitic lamprophyres from the Yilgarn Block, western Australia: au abundance and association with gold mineralization.Applied Geochemistry, Vol. 9, pp. 197-222.AustraliaAlkaline rocks -Shoshonite, Lamprophyre
DS1994-1750
1994
Rock, N.M.S.Taylor, W.R., Rock, N.M.S., Groves, D.I., Perring, C.S., GoldingGeochemistry of Archean shoshonitic lamprophyres from the Yilgarn Block: gold abundance and association with gold mineralizationApplied Geochemistry, Vol. 9, pp. 197-222AustraliaAlkaline rocks -Shoshonite, Lamprophyre
DS1995-1713
1995
Rock, N.M.S.Shand, P., Gaskarth, J.W., Rock, N.M.S.Late Caledonian lamprophyre dyke swarms of south eastern ScotlandMineralogy and Petrology, Vol. 51, No. 2/4, pp. 277-298.ScotlandLamprophyres, Dikes
DS2000-0374
2000
Rock, N.M.S.Gwalani, L.G., Rock, N.M.S., Ramasamy, Griffin, MulaiComplexly zoned Ti rich melanite schorlomite garnets from Ambadungar carbonatite alkalic complex, DeccanJournal of Asian Earth Science, Vol. 18, No.2, Apr. pp.163-76.India, Gujarat, WesternCarbonatite, Deposit - Ambadungar
DS2000-0823
2000
Rock and GemRock and GemDiscovery of the Ferris outlierRock & Gem, Vol. 75, Sept-Oct, p. 353.WyomingNews item, History
DS2002-1348
2002
Rock Chips Alberta Geological SurveyRock Chips Alberta Geological SurveyDiamond exploration studies in glaciated terrainRock Chips ( Alberta), Fall/winter, p. 3.AlbertaGeochemistry, overview of area sampling
DS2002-1349
2002
Rock Chips Alberta Geological SurveyRock Chips Alberta Geological SurveyRegional till sampling in the Buffalo Head HillsRock Chips ( Alberta), Fall/winter, p. 6.AlbertaGeochemistry, overview of area sampling
DS200512-0870
2004
Rockel, E.Power, M., Belcourt, G., Rockel, E.Geophysical methods for kimberlite exploration in northern Canada.Leading Edge, Vol. 23, 11, pp. 1124-1129.Canada, Northwest TerritoriesGeophysics - brief overview
DS201809-1999
2018
Rockett, G.Boxer, G., Rockett, G.Geology, resources and exploration potential of the Ellendale diamond project, west Kimberley, Western Australia.Government of Western Australia, Record 2018/8. 49p.Australia, Western Australiadeposit - Ellendale
DS1999-0605
1999
RocktalkRocktalkWhat are diamonds? Overview for laymanColorado Geological Survey, Vol. 2, No. 3, July pp. 1-12.ColoradoDiamonds - brief overview, History
DS1987-0615
1987
Rockwell, M.C.Rockwell, M.C., Macdonald, K.A.Processing technology for the recovery of placer mineralsMarine Mining, Vol. 6, No. 2, pp. 161-175GlobalGravity Seperation techniques, placer mining, Mining Methods
DS200912-0636
2009
Rockwell Diamonds Inc.Rockwell Diamonds Inc.Minority directors of Rockwell desperately attempt to distract.Rockwell Diamonds Inc., June 11, 1p.Africa, South AfricaNews item - Rockwell
DS200512-0453
2005
Rocky, N.M.S.Hwang, P., Taylor, W.R., Rocky, N.M.S., et al.Mineralogy, geochemistry and petrogenesis of the Metters Bore no. 1 lamproite pipe, Calwynyardah field, West Kimberley Province, Western Australia.Mineralogy and Petrology, Vol. 51, 2-4, pp. 195-226.AustraliaLamproite, microdiamonds
DS1996-1199
1996
Rocky Mountain ConstructionRocky Mountain ConstructionColorado diamond mine up and runningRocky Mountain Construction, August 15, 2p.ColoradoNews item, Redaurum Limited
DS200612-0462
2005
Rod, J.K.Gilmore, E., Gleditsch, N.P., Lujala, P., Rod, J.K.Conflict diamonds: a new dataset. Primary deposits have low probability of being the object of conflict.Conflict Management and Peace Science, Vol. 22, 3, pp. 257-272.GlobalLegal - conflict diamonds
DS200612-0289
2006
Rodas, M.Crespo, E., Luque, F.J., Rodas, M., Wada, H., Gervilla, F.Graphite sulphide deposits in Ronda and Beni Bousera peridotites ( Spain and Morocco) and the origin of carbon in mantle derived rocks.Gondwana Research, Vol. 9, 3, pp. 279-290.Europe, Spain, Africa, MoroccoPeridotite
DS1994-0688
1994
Roday, P.P.Gwalani, L.G., Grifin, B.J., Chang, W-J., Roday, P.P.Alkaline and tholeiitic dyke swarms of Chhota Udaipur Complex, GujaratIndia.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p. PosterIndiaAlkaline rocks, Dyke
DS201808-1770
2018
Roddaz, M.Mourot, Y., Roddaz, M., Dera, G., Calves, G., Kim, J-H., Charboureau, A-C., Mounic, S., Raisson, S.Geochemical evidence for large scale drainage reorganization in northwest Africa during the Cretaceous.Geochemistry, Geophysics, Geosystems, Vol. 19, 5, pp. 1690-1712.Africageomorphology

Abstract: West African drainage reorganization during Cretaceous opening of the Atlantic Ocean is deciphered here from geochemical provenance studies of Central Atlantic sediments. Changes in the geochemical signature of marine sediments are reflected in major and trace element concentrations and strontium-neodymium radiogenic isotopic compositions of Cretaceous sedimentary rocks from eight Deep Sea Drilling Project (DSDP) sites and one exploration well. Homogeneous major and trace element compositions over time indicate sources with average upper (continental) crust signatures. However, detailed information on the ages of these sources is revealed by neodymium isotopes (expressed as ?Nd). The ?Nd(0) values from the DSDP sites show a three-step decrease during the Late Cretaceous: (1) the Albian-Middle Cenomanian ?Nd(0) values are heterogeneous (-5.5 to -14.9) reflecting the existence of at least three subdrainage basins with distinct sedimentary sources (Hercynian/Paleozoic, Precambrian, and mixed Precambrian/Paleozoic); (2) during the Late Cenomanian-Turonian interval, ?Nd(0) values become homogeneous in the deepwater basin (-10.3 to -12.4), showing a negative shift of 2 epsilon units interpreted as an increasing contribution of Precambrian inputs; (3) this negative shift continues in the Campanian-Maastrichtian (?Nd(0)?=?-15), indicating that Precambrian sources became dominant. These provenance changes are hypothesized to be related to the opening of the South and Equatorial Atlantic Ocean, coincident with tectonic uplift of the continental margin triggered by Africa-Europe convergence. Finally, the difference between ?Nd(0)values of Cretaceous sediments from the Senegal continental shelf and from the deepwater basins suggests that ocean currents prevented detrital material from the Mauritanides reaching deepwater areas.
DS1980-0194
1980
Roddick, J.C.Kramers, J.D., Roddick, J.C.Isotopic and Trace Element Studies on Vein Fillings and Metasomatic Zones in the Mantle: Xenoliths from Bultfontein Kimberlite, South Africa.Eos, Vol. 61, No. 17, P. 414. (abstract.).South AfricaIsotope
DS1984-0009
1984
Roddick, J.C.Allsopp, H.L., Roddick, J.C.Rubidium-Strontium and 40 Ar age determinations on phlogopite micas from the Pre-Lebombo group Dokolwayo kimberlite pipeGeological Society of South Africa Spec. Publishing Ed. Erlank, A.J., No. 13, pp. 267-272South AfricaGeochronology, Argon, Age Determinations
DS1986-0752
1986
Roddick, J.C.Smith, C.B., Allsopp, H.L., Kramers, J.D., Hutchinson, G., Roddick, J.C.Emplacement ages of Jurassic Cretaceous South African kimberlites by the RbSR method on phlogopite and whole rocksamplesTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 249-266South AfricaGeochronology
DS1989-0653
1989
Roddick, J.C.Hogarth, D.D., Roddick, J.C.Discovery of Martin Frobisher's Baffin Island "ore" in IrelandCanadian Journal of Earth Sciences, Vol. 26, pp. 1053-60.IrelandHistory - samples, Ultramafic rocks
DS1993-0112
1993
Roddick, J.C.Bertrand, J-M., Roddick, J.C., et al.uranium-lead (U-Pb) geochronology of deformation and metamorphism across a central transect of the Early Proterozoic: Tornget Orogen, North River map area, Labrador.Canadian Journal of Earth Sciences, Vol. 30, pp. 1470-89.Labrador, Quebec, UngavaGeochronology
DS1996-0343
1996
Roddick, J.C.Davis, W.J., Parrish, R.R., Roddick, J.C., Heaman, L.M.Isotopic age determinations of kimberlites and related rocks: methods andapplications.Geological Survey of Canada, LeCheminant ed, OF 3228, pp. 39-42.CanadaTechniques -Geochronology, Kimberlites
DS1996-0870
1996
Roddick, J.C.MacRae, N.D., Armitage, A.E., Miller, A.R., Roddick, J.C.The Diamondiferous Akluilak lamprophyre dyke, Gibson Lake area, northwest TerritoriesGeological Survey of Canada, LeCheminant ed, OF 3228, pp. 101-107.Northwest TerritoriesLamprophyre, Akluilak dyke
DS2000-0382
2000
Roddick, J.C.Hamilton, M.A., Roddick, J.C., Delaney, G.New uranium-lead (U-Pb) geochronological constraints on the age of basement and cover in the eastern Wollaston Domain...Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.SaskatchewanGeochronology, Craton - Rae and Hearne
DS1983-0374
1983
Roddick, J.C.M.Kramers, J.D., Roddick, J.C.M., Dawson, J.B.Trace Element and Isotope Studies on Veined Metasomatic And marid Xenoliths from Bultfontein South Africa.Earth Plan. Sci. Letters, Vol. 65, No. 1, OCTOBER, PP. 90-106.South AfricaIsotope, Rare Earth Elements (ree)
DS1960-0737
1966
Roddy, D.J.Roddy, D.J.The Paleozoic Crater at Flynn Creek, TennesseePh.d. Thesis, United States, Western Tennessee, Central StatesCryptoexplosion
DS1960-0738
1966
Roddy, D.J.Roddy, D.J., Biehler, S.Recent Geological Studies of the Flynn Creek Structure, Tennessee.Geological Society of America (GSA) SPECIAL PAPER., No. 87, PP. 261-262, (abstract.).GlobalKimberlite, Western Tennessee, Central States, Cryptoexplosion
DS1960-1014
1968
Roddy, D.J.Roddy, D.J.The Flynn Creek Crater, Tennessee- Shock Metamorphism of Natural Materials.First Conference Greenbelt, Maryland, Monobrook Corporation., PP. 291-322.GlobalKimberlite, Western Tennessee, Central States, Cryptoexplosion
DS1960-1015
1968
Roddy, D.J.Roddy, D.J.Comet Impact and Formation of Flynn Creek and Other Craters with Central Peaks.Eos, Vol. 49, No. 1, P. 272, (abstract.).GlobalKimberlite, Western Tennessee, Central States, Cryptoexplosion
DS201807-1506
2018
Rodel, A.Lebedev, A., Rodel, A.Application of dynamic simulation for the Gahcho Kue project. GPSS, LIMNSAIMM Diamonds - source to use 2018 Conference 'thriving in changing times'. June 11-13., pp. 259-284.Canada, Northwest Territoriesdeposit - Gahcho Kue
DS201812-2874
2018
Rodel, A.Rodel, A.Ramping up from construction to operations: lessons learned at Gahcho Kue diamond mine.2018 Yellowknife Geoscience Forum , p. 65. abstractCanada, Northwest Territoriesdeposit - Gahcho Kue

Abstract: Numerous glacial dispersal trains, spatially and compositionally associated to kimberlites, have been characterized and mapped in the Lac de Gras region, Northwest Territories (NT). However, a small number of these trains have yet to be associated with a source. Additionally, a number of known sub-cropping kimberlites do not have well-defined, spatially associated, trains of indicator minerals. These issues suggest that local factors may be important in controlling the occurrence, shape, and strength of a dispersal pattern and its spatial association with a kimberlite. Identifying these factors and understanding their effect on the dispersion of indicator minerals could provide a road map for finding additional diamondiferous kimberlites in the NT and elsewhere. Here we examine contrasting dispersal trains from south and southwest of Lac de Gras, as well as situations where the source of known dispersal trains (e.g., Coppermine Train) continue to elude exploration geologists. Using both surface and subsurface datasets, we find that the bedrock geology and topography of the source area, as well as those of the dispersal area, are potential key controls on the type and shape of dispersal patterns. Even across discontinuous drift and subdued shield relief we find that bedrock topography and lithology modulated the effect of glacial dynamics on till production and provenance. These 'bedrock factors' have interacted in various ways during Quaternary glaciations, in combinations unique to each case, to generate complex dispersal patterns in three dimensions. Accounting for these factors, using both surface and subsurface data, could enhance the success of drift exploration programs and improve their outcome in the glaciated shield terrains of northern Canada.
DS201606-1119
2016
Rodemann, T.Soltys, A., Giuliani, A., Phillips, D., Kamenetsky, V.S., Maas, R., Woodhead, J., Rodemann, T.In-situ assimilation of mantle minerals by kimberlitic magmas - direct evidence from a garnet wehrlite xenolith entrained in the Bultfontein kimberlite ( Kimberley, South Africa).Lithos, Vol. 256-257, pp. 182-196.Africa, South AfricaDeposit - Bultfontein

Abstract: The lack of consensus on the possible range of initial kimberlite melt compositions and their evolution as they ascend through and interact with mantle and crustal wall rocks, hampers a complete understanding of kimberlite petrogenesis. Attempts to resolve these issues are complicated by the fact that kimberlite rocks are mixtures of magmatic, xenocrystic and antecrystic components and, hence, are not directly representative of their parental melt composition. Furthermore, there is a lack of direct evidence of the assimilation processes that may characterise kimberlitic melts during ascent, which makes understanding their melt evolution difficult. In this contribution we provide novel constraints on the interaction between precursor kimberlite melts and lithospheric mantle wall rocks. We present detailed textural and geochemical data for a carbonate-rich vein assemblage that traverses a garnet wehrlite xenolith [equilibrated at ~ 1060 °C and 43 kbar (~ 140-145 km)] from the Bultfontein kimberlite (Kimberley, South Africa). This vein assemblage is dominated by Ca-Mg carbonates, with subordinate oxide minerals, olivine, sulphides, and apatite. Vein phases have highly variable compositions indicating formation under disequilibrium conditions. Primary inclusions in the vein minerals and secondary inclusion trails in host wehrlite minerals contain abundant alkali-bearing phases (e.g., Na-K bearing carbonates, Mg-freudenbergite, Na-bearing apatite and phlogopite). The Sr-isotope composition of vein carbonates overlaps those of groundmass calcite from the Bultfontein kimberlite, as well as perovskite from the other kimberlites in the Kimberley area. Clinopyroxene and garnet in the host wehrlite are resorbed and have Si-rich reaction mantles where in contact with the carbonate-rich veins. Within some veins, the carbonates occur as droplet-like, globular segregations, separated from a similarly shaped Si-rich phase by a thin meniscus of Mg-magnetite. These textures are interpreted to represent immiscibility between carbonate and silicate melts. The preservation of reaction mantles, immiscibility textures and disequilibrium in the vein assemblage, suggests quenching, probably triggered by entrainment and rapid transport toward the Earth's surface in the host kimberlite magma. Based on the Sr-isotope systematics of vein carbonate minerals, and the close temporal relationship between carbonate-rich metasomatism and kimberlite magmatism, we suggest that the carbonate-rich vein assemblage was produced by the interaction between a melt genetically related to the Bultfontein kimberlite and wehrlitic mantle wall rock. If correct, this unique xenolith sample provides a rare snapshot of the assimilation processes that might characterise parental kimberlite melts during their ascent through the lithospheric mantle.
DS201708-1563
2017
Rodemann, T.Abersteiner, A., Kamanetsky, V.S., Kamenetsky, M., Goemann, K., Ehrig, K., Rodemann, T.Significance of halogens ( F, Cl) in kimberlite melts: insights from mineralogy and melt inclusions in the Roger pipe ( Ekati, Canada).Chemical Geology, in press available, 16p.Canada, Northwest Territoriesdeposit, Roger, Ekati

Abstract: The abundance and distribution of halogens (F, Cl) are rarely recorded in kimberlites and therefore their petrogenetic significance is poorly constrained. Halogens are usually present in kimberlite rocks in the structure of phlogopite and apatite, but their original concentrations are never fully retained due to the effects of alteration. To provide new constraints on the origin and evolution of halogens in kimberlites and their melts, we present a detailed study of the petrography and geochemistry of the late-Cretaceous Group-I (or archetypal) Roger kimberlite (Ekati cluster, Canada). The studied samples contain abundant anhedral-to-euhedral olivine which is set in a crystalline groundmass of monticellite, phlogopite, apatite, spinel (i.e. magnesian ulvöspinel-magnetite (MUM), Mg-magnetite, pleonaste, Cr-spinel), and perovskite along with abundant secondary alteration phases (i.e. serpentine, garnet (andradite-schlorlomite), amakinite ((Fe2 +, Mg, Mn)(OH)2), calcite). The Roger kimberlite is characterised by the highest recorded F-content (up to 2688 ppm) of the Ekati cluster kimberlites, which is reflected by the preservation of F-rich phases, where bultfonteinite (Ca4(Si2O7)(F, OH)2) and fluorite commonly replace olivine. In order to examine the composition and evolution of the kimberlite melt prior to post-magmatic processes, we studied melt inclusions in olivine, Cr-spinel, monticellite and apatite. Primary multiphase melt inclusions in Cr-spinel, monticellite and apatite and secondary inclusions in olivine are shown to contain a diversity of daughter phases and compositions that are dominated by alkali/alkali-earth (Na, K, Ba, Sr)-enriched Ca-Mg-carbonates ± F, Na-K-chlorides and sulphates, phosphates ± REE, spinel, silicates (e.g. olivine, phlogopite, (clino)humite), and sulphides. Although alkali/alkali-earth- and halogen-bearing phases are abundant in melt inclusions, they are generally absent from the kimberlite groundmass, most likely due to ubiquitous effects of syn- and/or post-magmatic alteration (i.e. serpentinisation). Comparisons between halogens and other trace elements of similar compatibility (i.e. F/Nd and Cl/U) in the Roger kimberlite and their respective estimated primitive mantle abundances show that halogens should be a more significant component in kimberlites than typically measured. We propose that fluorine in the Roger kimberlite was magmatic and was redistributed during hydrothermal alteration by Ca-bearing serpentinising fluids to produce the observed bultfonteinite/fluorite assemblages. Based the compositions and daughter mineral assemblages in primary melt inclusions and reconstructed halogen abundances, we suggest that Cr-spinel, monticellite and apatite crystallised from a variably differentiated Si-P-Cl-F-bearing carbonate melt that was enriched in alkalis/alkali-earths and highly incompatible trace elements
DS201708-1564
2017
Rodemann, T.Abersteiner, A., Kamanetsky, V.S., Pearson, D.G., Kamenetsky, M., Ehrig, K., Goemann, K., Rodemann, T.Monticellite in group I kimberlites: implications for evolution of parallel melts and post emplacement CO2 degassing. Leslie, Pipe 1Chemical Geology, in press available, 54p.Canada, Northwest Territories, Europe, Finlanddeposit, Leslie

Abstract: Monticellite is a magmatic and/or deuteric mineral that is often present, but widely varying in concentrations in Group-I (or archetypal) kimberlites. To provide new constraints on the petrogenesis of monticellite and its potential significance to kimberlite melt evolution, we examine the petrography and geochemistry of the minimally altered hypabyssal monticellite-rich Leslie (Canada) and Pipe 1 (Finland) kimberlites. In these kimberlites, monticellite (Mtc) is abundant (25–45 vol%) and can be classified into two distinct morphological types: discrete and intergrown groundmass grains (Mtc-I), and replacement of olivine (Mtc-II). Monticellite in group-I kimberlites: Implications for evolution of parental melts and post-emplacement CO 2 degassing (PDF Download Available).
DS201802-0216
2018
Rodemann, T.Abersteiner, A., Kamenetsky, V.S., Kamenetsky, M., Goemann, K., Ehrig, K., Rodemann, T.Significance of halogens ( F, Cl) in kimberlite melts: insights from mineralogy and melt inclusions in the Roger pipe ( Ekati, Canada).Chemical Geology, Vol. 478, pp. 148-163.Canada, Northwest Territoriesdeposit - Roger

Abstract: The abundance and distribution of halogens (F, Cl) are rarely recorded in kimberlites and therefore their petrogenetic significance is poorly constrained. Halogens are usually present in kimberlite rocks in the structure of phlogopite and apatite, but their original concentrations are never fully retained due to the effects of alteration. To provide new constraints on the origin and evolution of halogens in kimberlites and their melts, we present a detailed study of the petrography and geochemistry of the late-Cretaceous Group-I (or archetypal) Roger kimberlite (Ekati cluster, Canada). The studied samples contain abundant anhedral-to-euhedral olivine which is set in a crystalline groundmass of monticellite, phlogopite, apatite, spinel (i.e. magnesian ulvöspinel-magnetite (MUM), Mg-magnetite, pleonaste, Cr-spinel), and perovskite along with abundant secondary alteration phases (i.e. serpentine, garnet (andradite-schlorlomite), amakinite ((Fe2 +, Mg, Mn)(OH)2), calcite). The Roger kimberlite is characterised by the highest recorded F-content (up to 2688 ppm) of the Ekati cluster kimberlites, which is reflected by the preservation of F-rich phases, where bultfonteinite (Ca4(Si2O7)(F, OH)2) and fluorite commonly replace olivine. In order to examine the composition and evolution of the kimberlite melt prior to post-magmatic processes, we studied melt inclusions in olivine, Cr-spinel, monticellite and apatite. Primary multiphase melt inclusions in Cr-spinel, monticellite and apatite and secondary inclusions in olivine are shown to contain a diversity of daughter phases and compositions that are dominated by alkali/alkali-earth (Na, K, Ba, Sr)-enriched Ca-Mg-carbonates ± F, Na-K-chlorides and sulphates, phosphates ± REE, spinel, silicates (e.g. olivine, phlogopite, (clino)humite), and sulphides. Although alkali/alkali-earth- and halogen-bearing phases are abundant in melt inclusions, they are generally absent from the kimberlite groundmass, most likely due to ubiquitous effects of syn- and/or post-magmatic alteration (i.e. serpentinisation). Comparisons between halogens and other trace elements of similar compatibility (i.e. F/Nd and Cl/U) in the Roger kimberlite and their respective estimated primitive mantle abundances show that halogens should be a more significant component in kimberlites than typically measured. We propose that fluorine in the Roger kimberlite was magmatic and was redistributed during hydrothermal alteration by Ca-bearing serpentinising fluids to produce the observed bultfonteinite/fluorite assemblages. Based the compositions and daughter mineral assemblages in primary melt inclusions and reconstructed halogen abundances, we suggest that Cr-spinel, monticellite and apatite crystallised from a variably differentiated Si-P-Cl-F-bearing carbonate melt that was enriched in alkalis/alkali-earths and highly incompatible trace elements.
DS201802-0217
2018
Rodemann, T.Abersteiner, A., Kamenetsky, V.S., Pearson, D.G., Kamenetsky, M., Goemann, K., Ehrig, K., Rodemann, T.Monticellite in group I kimberlites: implications for evolution of parental melts and post emplacement CO2 degassing.Chemical Geology, Vol. 478, pp. 76-88.Canada, Northwest Territories, Europe, Finlanddeposit - Leslie, Pipe 1

Abstract: Monticellite is a magmatic and/or deuteric mineral that is often present, but widely varying in concentrations in Group-I (or archetypal) kimberlites. To provide new constraints on the petrogenesis of monticellite and its potential significance to kimberlite melt evolution, we examine the petrography and geochemistry of the minimally altered hypabyssal monticellite-rich Leslie (Canada) and Pipe 1 (Finland) kimberlites. In these kimberlites, monticellite (Mtc) is abundant (25-45 vol%) and can be classified into two distinct morphological types: discrete and intergrown groundmass grains (Mtc-I), and replacement of olivine (Mtc-II). Primary multiphase melt inclusions in monticellite, perovskite and Mg-magnetite contain assemblages dominated by alkali (Na, K, Ba, Sr)-enriched Ca-Mg-carbonates, chlorides, phosphates, spinel, silicates (e.g. olivine, phlogopite) and sulphides. These melt inclusions probably represent snapshots of a variably differentiated kimberlite melt that evolved in-situ towards carbonatitic and silica-poor compositions. Although unconstrained in their concentration, the presence of alkali-carbonates and chlorides in melt inclusions suggests they are a more significant component of the kimberlite melt than commonly recorded by whole-rock analyses. We present petrographic and textural evidence showing that pseudomorphic Mtc-II resulted from an in-situ reaction between olivine and the carbonate component of the kimberlite melt in the decarbonation reactio. This reaction is supported by the preservation of abundant primary inclusions of periclase and to a lesser extent Fe-Mg-oxides in monticellite, perovskite and Mg-magnetite. Based on the preservation of primary periclase inclusions, we infer that periclase also existed in the groundmass, but was subsequently altered to brucite. We suggest that CO2 degassing in the latter stages of kimberlite emplacement into the crust is largely driven by the observed reaction between olivine and the carbonate melt. For this reaction to proceed, CO2 should be removed (i.e. degassed), which will cause further reaction and additional degassing in response to this chemical system change (Le Chatelier's principle). Our study demonstrates that these proposed decarbonation reactions may be a commonly overlooked process in the crystallisation of monticellite and exsolution of CO2, which may in turn contribute to the explosive eruption and brecciation processes that occur during kimberlite magma emplacement and pipe formation.
DS201902-0255
2019
Rodemann, T.Abersteiner, A., Kamenetsky, V.S., Goemann, K., Golovin, A.V., Sharygin, I.S., Giuliani, A., Rodemann, T., Spetsius, Z.V., Kamenetsky, M.Djerfisherite in kimberlites and their xenoliths: implications for kimberlite melt evolution.Contributions to Mineralogy and Petrology, Vol. 174, 8 22p. Africa, South Africa, Russia, Canada, Northwest Territoriesdeposit - Bultfontein, Roberts Victor, Udachnaya-East, Obnazhennaya, Vtorogodnitsa, Koala, Leslie

Abstract: Djerfisherite (K6(Fe,Ni,Cu)25S26Cl) occurs as an accessory phase in the groundmass of many kimberlites, kimberlite-hosted mantle xenoliths, and as a daughter inclusion phase in diamonds and kimberlitic minerals. Djerfisherite typically occurs as replacement of pre-existing Fe-Ni-Cu sulphides (i.e. pyrrhotite, pentlandite and chalcopyrite), but can also occur as individual grains, or as poikilitic phase in the groundmass of kimberlites. In this study, we present new constraints on the origin and genesis of djerfisherite in kimberlites and their entrained xenoliths. Djerfisherite has extremely heterogeneous compositions in terms of Fe, Ni and Cu ratios. However, there appears to be no distinct compositional range of djerfisherite indicative of a particular setting (i.e. kimberlites, xenoliths or diamonds), rather this compositional diversity reflects the composition of the host kimberlite melt and/or interacting metasomatic medium. In addition, djerfisherite may contain K and Cl contents less than the ideal formula unit. Raman spectroscopy and electron backscatter diffraction (EBSD) revealed that these K-Cl poor sulphides still maintain the same djerfisherite crystal structure. Two potential mechanisms for djerfisherite formation are considered: (1) replacement of pre-existing Fe-Ni-Cu sulphides by djerfisherite, which is attributed to precursor sulphides reacting with metasomatic K-Cl bearing melts/fluids in the mantle or the transporting kimberlite melt; (2) direct crystallisation of djerfisherite from the kimberlite melt in groundmass or due to kimberlite melt infiltration into xenoliths. The occurrence of djerfisherite in kimberlites and its mantle cargo from localities worldwide provides strong evidence that the metasomatising/infiltrating kimberlite melt/fluid was enriched in K and Cl. We suggest that kimberlites originated from melts that were more enriched in alkalis and halogens relative to their whole-rock compositions.
DS202003-0357
2020
Rodemann, T.Potter, N.J., Kamenetsky, V.S., Chakhmouradian, A.R., Kamenetsky, M.B., Goemann, K., Rodemann, T.Polymineralic inclusions in oxide minerals of the Afrikanda alkaline ultramafic complex: implications for the evolution of perovskite mineralization.Contributions to Mineralogy and Petrology, Vol. 175, 13p. PdfRussiaperovskite

Abstract: The exceptional accumulation of perovskite in the alkaline-ultramafic Afrikanda complex (Kola Peninsula, Russia) led to the study of polymineralic inclusions hosted in perovskite and magnetite to understand the development of the perovskite-rich zones in the olivinites, clinopyroxenites and silicocarbonatites. The abundance of inclusions varies across the three perovskite textures, with numerous inclusions hosted in the fine-grained equigranular perovskite, fewer inclusions in the coarse-grained interlocked perovskite and rare inclusions in the massive perovskite. A variety of silicate, carbonate, sulphide, phosphate and oxide phases are assembled randomly and in variable proportions in the inclusions. Our observations reveal that the inclusions are not bona fide melt inclusions. We propose that the inclusions represent material trapped during subsolidus sintering of magmatic perovskite. The continuation of the sintering process resulted in the coarsening of inclusion-rich subhedral perovskite into inclusion-poor anhedral and massive perovskite. These findings advocate the importance of inclusion studies for interpreting the origin of oxide minerals and their associated economic deposits and suggest that the formation of large scale accumulations of minerals in other oxide deposits may be a result of annealing of individual disseminated grains.
DS200812-0525
2008
Roden, E.E.Johnson, C.M., Beard, B.L., Roden, E.E.The iron isotope fingerprints of redox and biogeochemical cycling in modern and ancient Earth.Annual Review of Earth and Planetary Sciences, Vol. 36, May, pp. 457-493.MantleRedox
DS1975-1056
1979
Roden, H.K.Hart, S.R., Padovani, E.R., Roden, H.K.Strontium Isotopic Relationships in Lower Crustal Nodules from Kilbourne Hole, New Mexico.Geological Society of America (GSA), Vol. 11, No. 7, P. 439. (abstract.).United States, New Mexico, Colorado PlateauBlank
DS1990-0876
1990
Roden, M.Kornprobst, J., Piboule, M., Roden, M., Tabit, A.Corundum bearing garnet clinopyroxenites at Beni Bousera (Morocco):original plagioclase rich gabbros recrystallized at depth within the mantle?Journal of Petrology, Vol. 31, pt. 3, pp. 717-745MoroccoMantle, Gabbros
DS1990-0877
1990
Roden, M.Kornprobst, J., Piboule, M., Roden, M., Tabit, A.Corundum-bearing garnet clinopyroxenites at Beni-Bousera (Morocco)-original plagioclase-rich gabbros recrystallized at depth within the mantleJournal of Petrology, Vol. 31. No. 3, June pp. 597-628MoroccoPetrology, Beni-Bousera
DS1997-0015
1997
Roden, M.Akinin, V.V., Roden, M., Francis, D., Apt, J., Moll-StalcupCompositional and thermal state of the upper mantle beneath the Bering Seabasalt Province: evidence....Canadian Journal of Earth Sciences, Vol. 34, No. 6, June pp. 789-800.RussiaChukchi Peninsula, Basalts
DS2003-1175
2003
Roden, M.Roden, M., Patino-Douce, A., Lazko, E., Jagoutz, E.Exsolution textures in high pressure garnets, Mir kimberlite, Sibveria8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractRussia, SiberiaDeposit - Mir
DS200412-1680
2003
Roden, M.Roden, M., Patino-Douce, A., Lazko, E., Jagoutz, E.Exsolution textures in high pressure garnets, Mir kimberlite, Sibveria.8 IKC Program, Session 6, POSTER abstractRussia, SiberiaMantle petrology Deposit - Mir
DS200512-0908
2004
Roden, M.Roden, M., Patino-Douce, A., Lazko, E.E.Evidence for high pressure garnet pyroxenites in the continental lithosphere.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 17-4, Vol. 36, 5, p. 46.RussiaMir, mineral chemistry
DS1975-0569
1977
Roden, M. WILSHIRE.Mcgetchin, T.R., Smith, D., Ehrenberg, S.N., Roden, M. WILSHIRE.Navajo Kimberlites and Minettes GuideInternational Kimberlite Conference SECOND EXTENDED ABSTRACT VOLUME., Colorado PlateauKimberlite
DS1970-0352
1971
Roden, M.F.Mcdowell, F.W., Roden, M.F., Arculus, R.J., Smith, D.Potassic Volcanism and Associated Inclusion on the Coloradoplateau.Geological Society of America (GSA), Vol. 10, P. 116, (abstract.).Colorado PlateauKimberlite, Rocky Mountains
DS1975-0605
1977
Roden, M.F.Roden, M.F.Field Geology and Petrology of the Minette Diatreme at Buell Park, Apache County Arizona. #1International Kimberlite Conference SECOND, EXTENDED ABSTRACT VOLUME., Colorado Plateau, ArizonaKimberlite, Rocky Mountains, Colorado Plateau
DS1975-0606
1977
Roden, M.F.Roden, M.F.Field Geology and Petrology of the Minette Diatreme at Buell Park Apache County, Arizona. #2Msc. Thesis, University Texas, Austin., United States, Colorado Plateau, ArizonaLamprophyres
DS1975-0852
1978
Roden, M.F.Roden, M.F.Trace Element Geochemistry of Mafic and Felsic Minettes, Buell Park Diatreme, Navajo Volcanic Field.Geological Society of America (GSA), Vol. 10, No. 7, P. 480. (abstract.).United States, Arizona, Colorado PlateauBlank
DS1975-1205
1979
Roden, M.F.Roden, M.F., Smith, D.Field Geology, Chemistry and Petrology of Buell Park Minette Diatreme, Apache County, Arizona.International Kimberlite Conference SECOND Proceedings, Vol. 1, PP. 364-381.GlobalKimberlite, Colorado Plateau, Rocky Mountains
DS1980-0314
1980
Roden, M.F.Smith, D., Roden, M.F.Geothermometry and Kinetics in a Two Spinel Peridotite NodulEos, Vol. 61, No. 17, APRIL 22ND. P. 393.(abstract.).United States, Colorado PlateauBlank
DS1980-0315
1980
Roden, M.F.Smith, D., Roden, M.F.Comparative Spinel Olivine Pyroxene equilibration temperatures in Mantle Peridotite, Southwestern UsaInternational CONG. 26TH., Vol. 1, SECT. 1-5, P. 146. (abstract.).United States, New Mexico, Arizona, Colorado PlateauBlank
DS1982-0525
1982
Roden, M.F.Roden, M.F., Smith, D., Frey, F.A.Mantle with Oceanic Affinities Beneath the Colorado Plateau: Rare Earth Elements (ree) Evidence.Geological Society of America (GSA), Vol. 14, No. 6, P. 348, (abstract.).ColoradoKimberlite, Eclogite, Rocky Mountains, Colorado Plateau, Garnet
DS1983-0541
1983
Roden, M.F.Roden, M.F., Murthy, V.R., Gaspar, J.Isotopic Composition of the Source for the Jacupiranga Carbonatite, Brasil.Geological Association of Canada (GAC), Vol. 15, No. 4, P. 257. (abstract.).BrazilRelated Rocks
DS1984-0612
1984
Roden, M.F.Roden, M.F.Isotopic (strontium, Neodymium) Composition of the Source for the Navajo m Inettes, Colorado Plateau.Geological Society of America (GSA), Vol. 16, No. 6, P. 637. (abstract.).United States, Colorado PlateauGeobarometry
DS1985-0565
1985
Roden, M.F.Roden, M.F.Relationship of Mantle Metasomatism to Alkaline Volcanism: Cause or effect?Geological Society of America (GSA), Vol. 17, No. 3, P. 189. (abstract.)GlobalInclusions, Rare Earth Elements (ree)
DS1985-0566
1985
Roden, M.F.Roden, M.F., Murthy, R., Gaspar, J.C.Strontium and Neodymium Isotopic Composition of the Jacupiranga carbonatit E.Journal of GEOLOGY, Vol. 93, PP. 212-220.BrazilGeochronology, Isotope
DS1985-0567
1985
Roden, M.F.Roden, M.F., Murthy, V.R.Mantle Metasomatism (review)Annual Review Earth Science., Vol. 13, PP. 269-296.GlobalBlank
DS1986-0678
1986
Roden, M.F.Roden, M.F.Comparative geochemistry of continental lithosphere from distinct tectonicprovinces, southwestern USAGeological Society of America, Vol. 18, No. 2, p. 177. (abstract.)Colorado PlateauGreen Knobs, Kilbourne Hole, Tectonics
DS1987-0224
1987
Roden, M.F.Frey, F.A., Roden, M.F.The mantle source for the Hawaiian Islands: constraints from the lavas and ultramafic inclusionsIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 423-464HawaiiBlank
DS1987-0457
1987
Roden, M.F.McDowell, F.W., Roden, M.F., Smith, D.Comments on tectonic implications of the age, composition and orientation of lamprophyre dikes, Navajo volcanic field, Arizona #2Earth and Planetary Science Letters, Vol. 80, No. 3-4, pp. 415-420ArizonaUSA, Tectonics
DS1987-0616
1987
Roden, M.F.Roden, M.F.Navajo minettes as probes of Preoterozoic continental lithosphereGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.823. abstracColorado PlateauMinette
DS1987-0617
1987
Roden, M.F.Roden, M.F.Rubidium/Strontium and Sm/neodymium ratios of metasomatized mantle: implications for the roleof metasomatized mantle in the petrogenesis of Na2Orich alkaline basaltsMantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 127-138GlobalAnalyses p. 131
DS1988-0580
1988
Roden, M.F.Roden, M.F.Very depleted continental lithosphere beneath the Colorado PlateauV.m. Goldschmidt Conference, Program And Abstract Volume, Held May, p. 70. AbstractColorado PlateauBlank
DS1988-0581
1988
Roden, M.F.Roden, M.F., Irving, A.J., Rama Murthy, V.Isotopic and trace element composition of the upper mantle beneath a young continental rift: results from Kilbourne Hole,New MexicoGeochimica et Cosmochimica Acta, Vol. 52, No. 2, February pp. 461-474New MexicoBlank
DS1989-1292
1989
Roden, M.F.Roden, M.F., Shimizu, N.Compositional differences in the upper Mantle between the Colorado Plateau and the Basin and Range ProvincesEos, Vol. 70, No. 15, April 11, p. 509. (abstract.)Colorado PlateauGreen Knobs-Buell Park diatreme
DS1989-1293
1989
Roden, M.F.Roden, M.F., Smith, D., Shimizu, N.Composition of continental lithosphere beneath the Colorado Plateau And its role in the genesis of alkaline magmasNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 224. AbstractColorado PlateauMantle
DS1990-1252
1990
Roden, M.F.Roden, M.F., Shimizu, N.Correlation of upper mantle composition with crustal province, southwesternUSATerra, Abstracts of International Workshop Orogenic Lherzolites and Mantle Processes, Vol. 2, December abstracts p. 141Colorado PlateauMantle, Xenoliths
DS1990-1253
1990
Roden, M.F.Roden, M.F., Smith, D., Murthy, V.R.Chemical constraints on lithosphere composition and evolution beneath the Colorado PlateauJournal of Geophysical Research, Vol 95, No. B3, March 10, pp. 2811-2831Colorado PlateauMantle, Geochemistry
DS1991-1444
1991
Roden, M.F.Roden, M.F., Shimizu, N.Geochemical evidence for a depleted root beneath the Colorado PlateauEos Transactions, Vol. 72, No. 44, October 29, abstract p. 561Colorado PlateauGeochemistry, Mantle
DS1993-0889
1993
Roden, M.F.Lazko, E.E., Roden, M.F.Mineralogy of garnet peridotite xenoliths from the Mir kimberlite pipe, Siberia.American Geophysical Union, EOS, supplement Abstract Volume, October, Vol. 74, No. 43, October 26, abstract p. 637.Russia, SiberiaMineralogy, Deposit -Mir
DS1993-1314
1993
Roden, M.F.Roden, M.F., Shimizu, N.Ion microprobe analyses bearing on the composition of the upper mantle beneath the Basin and Range and Colorado Plateau Provinces.Journal of Geophysical Research, Vol. 98, No. B8, August 10, pp. 14, 091-14, 108.Colorado PlateauMantle, Basin and Range, Cordillera, Peridotite xenoliths, Buell Park, Green Knobs
DS1995-1584
1995
Roden, M.F.Roden, M.F., Lazko, E.E., Ponomarenko, A.I., Serenko, V.P.Mineralogy of peridotite xenoliths from the Mir kimberlite Yakutia, Russia.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 462-464.Russia, YakutiaXenoliths, Deposit -Mir
DS1998-1246
1998
Roden, M.F.Roden, M.F., Lazko, E.E., Jagoutz, E.Petrology and geochemistry of peridotite inclusions from the Mirkimberlite, Siberia.7th. Kimberlite Conference abstract, pp. 741-2.Russia, Siberia, YakutiaXenoliths - inclusions, Deposit - Mir
DS1999-0606
1999
Roden, M.F.Roden, M.F., Lazko, E.E., Jagoutz, E.The role of garnet pyroxenites in the Siberian lithosphere: evidence from the Mir kimberlite.7th International Kimberlite Conference Nixon, Vol. 2, pp. 714-20.Russia, Siberia, YakutiaMineralogy, thermobarometry, mineral chemistry, analyse, Deposit - Mir
DS200612-1165
2006
Roden, M.F.Roden, M.F., Paino-Douce, A.E., Jagoutz, E., Lazko, E.E.High pressure petrogenesis of Mg rich garnet pyroxenites from Mir kimberlite, Russia.Lithos, Vol. 90, 1-2, pp. 77-91.Russia, SiberiaMajorite
DS200612-1166
2006
Roden, M.F.Roden, M.F., PatinoDouce, A.E., Jagoutz, E., Lazko, E.E.High pressure petrogenesis of Mg rich garnet pyroxenites from Mir kimberlite, Russia.Lithos, Vol.90, 1-2, August pp. 77-91.Russia, YakutiaDeposit - Mir, petrology
DS201212-0633
2012
Roden, M.F.Semiz, B., Coban, H., Roden, M.F., Ozpinar, Y., Flower, M.F.J., McGregor, H.Mineral composition in cognate inclusions in Late Miocene-Early Pliocene potassic lamprophyres with affinities to lamproites from the Denizli region, Western Anatolia, Turkey: implications for uppermost mantle processes in a back arc setting.Lithos, in press available, 20p.Africa, TurkeyLamproite
DS2000-0824
2000
Roden, S.Roden, S., Smith, T.Sampling and analysis protocols and their role in mineral exploration and new resource development.Min. Res. Ore Res. Est. AusIMM Guide, Mon. 23, pp. 73-8.AustraliaEconomics - geostatistics, ore reserves, exploration, Not specific to diamonds
DS1995-0477
1995
Roden-Tice, M.Eby, G.N., Roden-Tice, M., et al.Geochronology and cooling history of the northern part of the Chilwaalkaline Province Malawi.Journal of African Earth Sciences, Vol. 20, No. 3-4, pp. 275-288.MalawiAlkaline rocks, Chilwa Alkaline Province
DS2002-0286
2002
Roden-Tice, M.Chiarenzelli, J.R., Roden-Tice, M.History and tectonic evolution of the Saskatchewan Craton, Trans Hudson OrogenGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.20., p.20.SaskatchewanTectonics
DS2002-0287
2002
Roden-Tice, M.Chiarenzelli, J.R., Roden-Tice, M.History and tectonic evolution of the Saskatchewan Craton, Trans Hudson OrogenGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.20., p.20.SaskatchewanTectonics
DS1960-0090
1960
Rodewald, H.J.Rodewald, H.J.Zur Genesis des DiamantenSchaffhausen: Meier., 69P.GlobalKimberlite, Kimberley, Janlib, Diamond
DS200712-0898
2006
Rodger, M.Rodger, M., Watts, A.B., Greenroyd, C.J., Peirce, C., Hobbs, R.W.Evidence for unusually thin oceanic crust and strong mantle beneath the Amazon Fan.Geology, Vol. 34, 12, pp. 1081-1084.South AmericaGeophysics - seismics
DS1994-1474
1994
Rodgers, A.Rodgers, A., Wahr, J.The trade off between volumetric and topographic structure for seismictraveltimes: 660 km topography and mantle structure.Geophys. Journal of International, Vol. 117, No. 1, April pp. 19-32.MantleGeophysics -seismics, Tomography
DS1995-1585
1995
Rodgers, A.Rodgers, A., Schwarz, S.Upper mantle velocity structure beneath Asia and the Tibetan Plateau from waveform analysis.Eos, Vol. 76, No. 46, Nov. 7. p.F383. Abstract.ChinaGeophysics -seismic, Mantle structure
DS200812-0848
2008
Rodgers, A.J.Park, Y., Nyblade, A.A., Rodgers, A.J., Al-Amri, A.S wave velocity structure of the Arabian shield upper mantle from Rayleigh wave tomography.Geochemistry, Geophysics, Geosystems: G3, in press available, 50p.MantleTomography
DS200612-1167
2006
Rodgers, E.J.A.Rodgers, E.J.A.Conflict diamonds: certification and corruption: a case study of Sierra Leone.Journal of Financial Crime, Vol. 13, 3, July 1, pp. 267-276.Africa, Sierra LeoneNews item - conflict diamonds
DS200712-0899
2006
Rodgers, E.J.A.Rodgers, E.J.A.Conflict diamonds: certification and corruption: a case study of Sierra Leone.Journal of Financial Crime, Vol. 13, 3, July 1, pp. 267-276.Africa, Sierra LeoneConflict diamonds
DS1988-0656
1988
Rodgers, J.Sougy, J., Rodgers, J.The West African connection: evolution of the central Atlantic ocean And its continental marginsProceedings of the Penrose Conference held in France Jan 17-22, 1984, pp. 311-515West AfricaBlank
DS1990-1254
1990
Rodgers, J.Rodgers, J.Fold and thrust belts in sedimentary rocks. Part I.: typical examplesAmerican Journal of Science, Vol. 290, No. 4, April pp. 321-359GlobalTectonics, Sedimentary rocks
DS1991-1445
1991
Rodgers, J.Rodgers, J.Fold and thrust belts in sedimentary rocks, Part 2, other examples especially variantsAmerican Journal of Science, Vol. 291, November pp. 825-886Norway, India, Bolivia, Ecuador, ArgentinaStructure -fold, thrust, Craton
DS1995-1586
1995
Rodgers, J.Rodgers, J.Lines of basement uplifts within the external parts of orogenic beltsAmerican Journal of Science, Vol. 295, April pp. 455-487.GlobalTectonics, Orogenic belts, craton, uplifts
DS1997-0964
1997
Rodgers, J.Rodgers, J.James Dwight Dana and the taconic controversyAmerican Journal of Science, Vol. 297, No. 3, March pp. 340-GlobalProfile - Dana, Taconic controversy
DS1997-0965
1997
Rodgers, J.Rodgers, J.Exotic nappes in external parts of orogenic beltsAmerican Journal of Science, Vol. 297, No. 2, Feb. 1, pp. 174-219United States, AppalachiaTectonics, Orogeny
DS200712-0670
2007
Rodgers, J.Mainprice, D., Le Page, Y., Rodgers, J., Jouanna, P.Predicted elastic properties of hydrous D phase at mantle pressures: implications for the anisotropy of subducted slabs near 670 km discontinuity and in the lower mantle.Earth and Planetary Science Letters, Vol. 259, 3-4, pp. 283-296.MantleSubduction
DS200712-0671
2007
Rodgers, J.Mainprice, D., Le Page, Y., Rodgers, J., Jouanna, P.Predicted elastic properties of hydrous D phase at mantle pressures: implications for the anisotropy of subducted slabs near 670 km discontinuity and in the lower mantle.Earth and Planetary Science Letters, Vol. 259, 3-4, pp. 283-296.MantleSubduction
DS1987-0618
1987
Rodgers, J.C.Rodgers, J.C.The Appalachian-Ouachita orogenic beltEpisodes, Vol. 10, No. 4, December pp. 259-266ArkansasCarbonatite
DS1995-1587
1995
Rodgers, K.Rodgers, K.Mining methods and operating costs for metalliferous MinesProspectors and Developers Association of Canada (PDAC) Short Course, March 4, pp. 113-132GlobalDue diligence, Ore reserves
DS200612-1098
2006
Rodgers, R.Polat, A., Herxberg, C., Munker, C., Rodgers, R., Kusky, T., Li, J., Fryer, B.Geochemical and petrological evidence for a supra subduction zone origin of Neoarchean (ca 2.5 Ga) peridotites, central orogenic belt, North Chin a craton.Geological Society of America Bulletin, Vol. 118, 7, July pp. 771-784.ChinaPeridotite, picrites
DS2002-0706
2002
Rodiguez Fernandez, L.R.Heredia, N., Rodiguez Fernandez, L.R., GallasteguiGeological setting of the Argentine frontal Cordillera in the flat slab segment 30 - 31)Journal of South American Earth Sciences, Vol.15,1,Apr.pp.79-99.Chile, AndesSubduction, Slab
DS1984-0613
1984
Rodionov, A.S.Rodionov, A.S., Pokhilenko, N.P., Sobolev, N.V.Comparative Description of Major Minerals of the Concentrate of the Two Varieties of Kimberlite of the Dalnyi Pipe of Yakutia.Soviet Geology And Geophysics, Vol. 25, No. 5, PP. 33-44.Russia, YakutiaMineralogy
DS1985-0568
1985
Rodionov, A.S.Rodionov, A.S., Sobolev, N.V.A New Find of Xenolith of Graphite Bearing Harzburgite in KimberliteSoviet Geology and Geophysics, Vol. 26, No. 12, December pp. 26-32RussiaXenolith, Petrology
DS1986-0767
1986
Rodionov, A.S.Sobolev, N.V., Pokhilenko, N.P., Carswell, D.A., Rodionov, A.S.Sheared lherzolites from kimberlites of YakutiaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 338-339RussiaBlank
DS1987-0005
1987
Rodionov, A.S.Amshinskiy, A.N., Kuigin, S.S., Rodionov, A.S.The significance of the volume of analyzed selections of accessory minerals of diamonds to characterize kimberlite bodies. (Russian)In: Methods for studying and modeling geol. phenomena, Akad. Nauk SSSR, pp. 5-16RussiaDiamond inclusions
DS1988-0582
1988
Rodionov, A.S.Rodionov, A.S., Amshinskiy, A.N., Pokhilenko, N.P.Ilmenite-pyrope wehrlites: a new type of paragenesis in xenoliths fromkimberliteSoviet Geology and Geophysics, Vol. 29, No. 7, pp. 48-51RussiaXenoliths, Wehrlites
DS1991-1446
1991
Rodionov, A.S.Rodionov, A.S., Sobolev, N.V., Pokhilenko, N.P., Suddaby, P.Ilmenite-bearing peridotites and megacrysts from Dalnaya kimberlite pipe, YakutiaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 339-341RussiaMineral chemistry, ilmenite-pyrope lherzolite, Ilmenite-pyrope wehrlites, Metasomatism
DS1998-1247
1998
Rodionov, A.S.Rodionov, A.S., Viljoen, K.S.Venetia megacrysts, northern Province, South Africa7th. Kimberlite Conference abstract, pp. 743-5.South AfricaMineral chemistry, Deposit - Venetia
DS200912-0797
2009
Rodionov, N.A.V.A.Vetrin, V.A.R.A., Lepekhina, E.A.N.A., Paderin, I.A.P.A., Rodionov, N.A.V.A.Stages of the lower crust formation of the Belomorian mobile belt, Kola Peninsula.Doklady Earth Sciences, Vol. 425, 2, pp. 269-273.Russia, Kola PeninsulaCraton
DS200812-0103
2008
Rodionov, N.V.Belyatsky, B.V., Antonov, A.V., Rodionov, N.V., Laiba, A.A., Sergeev, S.A.Age and composition of carbonatite kimberlite dykes in the Prince Charles Mountains, East Antarctica9IKC.com, 3p. extended abstractAntarcticaCarbonatite
DS201201-0859
2011
Rodionov, N.V.Rodionov, N.V., Belyatsky, B.V., Antonov, A.V., Kapitonov, I.N., Sergeev, S.A.Comparative in-situ U-Th-Pb geochronology and trace element composition of baddeleyite and low U zircon from carbonatites of the Paleozoic Kovdor, Kola Pen.Gondwana Research, in press available 17p.Russia, Kola PeninsulaCarbonatite
DS201212-0373
2012
Rodionov, N.V.Koreshkova, M.Yu., Downes, H., Rodionov, N.V., Antonov, A.V., Glebovitski, V.A., Sergeev, S.A., Schukina, E.V.Trace element and age characteristics of zircons in lower crustal xenoliths from the Grib kimberlite pipe, Arkhangelsk province, Russia.emc2012 @ uni-frankfurt.de, 1p. AbstractRussia, Archangel, Kola PeninsulaDeposit - Grib
DS201212-0593
2012
Rodionov, N.V.Rodionov, N.V., Belyatsky, B.V., Antonov, A.V., Kapitonov, I.N., Sergeev, S.A.Comparative in-situ U-Th-Pb geochronology and trace element composition of baddeleyite and low U-zircon from carbonatites of the Paleozoic Kovdor alkaline ultramafic complex Kola Peninsula, Russia.Gondwana Research, Vol. 21, 4, pp. 728-744.Russia, Kola PeninsulaCarbonatite
DS201312-0276
2013
Rodionov, N.V.Frantz, N.A., Rodionov, N.V., Lokhov, K.I.Carbonatites age of the Tiksheozero massive (North Karelia, Russia).Goldschmidt 2013, AbstractRussiaCarbonatite
DS201412-0472
2014
Rodionov, N.V.Koreshkova, M.Yu., Downes, H., Glebovitsky, V.A., Rodionov, N.V., Antonov, A.V., Sergeev, S.A.Zircon trace element characteristics and ages in granulite xenoliths: a key to understanding the age and origin of the lower crust, Arkhangelsk kimberlite province, Russia.Contributions to Mineralogy and Petrology, Vol. 167, pp. 973-980.Russia, Archangel, Kola PeninsulaDeposit - Grib
DS201709-2049
2017
Rodionov, N.V.Rodionov, N.V. , Lepekhina, E.N., Antonov, A.V., Petrov, O.V., Belyatsky, B.V., Shevchenko, S.S., Sergeev, S.A.Pyrochlore and baddeleyite from carbonatites of the Paleozoic polyphase Kovdor Massif ( N. Karelia).Goldschmidt Conference, abstract 1p.Russia, Kareliacarbonatite. Kovdor

Abstract: Pyrochlore is the main host of rare-metal elements of carbonatite rocks, including phoscorites, typical for prolonged history of alkaline magma crystallization at the mafic-ultramafic polyphase Kovdor massif. Pyrochlore associated with baddeleyite, zircon, zirkelite, zirkonolite and forms octahedral and cube-octahedral poikilitic crystals up to 2-5 cm, and represented by U, Ba-Sr and REE species of pyrochlore subgroup. The studied Kovdor pyrochlores are characterized by increased up to 6.5% U and an extremely high Th – up to 40%, with Th/U up to 500. Pyrochlore U-Pb SHRIMP ages of 290-364 Ma correlate with variations in U of different samples, whereas the Th and common Pb have a minor effect on this value. Obtained ages are significantly underestimated and may reflect the influence of the matrix effect or later low-temperature closing of the U-Pb pyrochlore system, as well as the actual transformations of pyrochlore crystal matrix due to the interaction with the late carbonate fluids. Thus the early pyrochlores and U-pyrochlores crystallized at 364 Ma within phoscorites and early calcite carbonatites, whereas Sr-Ba pyrochlores of late calcitedolomite carbonatite formed at 340 Ma, and Th-pyrochlore rims occured at the later stages of the interaction with metasomatizing fluids 290 m.y. ago. Kovdor baddeleyite is also charecterized by high composition heterogeneity determined by the difference in its origin from olivinites to ore-bearing foscorites and postmagmatic syenites. But baddeleyite from calcitemagnetite mineral association have uniform U: 184 ±40, Th: 6.4 ±1.7, ¦REE: 34 ±6, Hf: 7629 ± 599, Nb: 3595 ±840, Ti: 56 ±14, Y: 22 ±4 ppm, and HHf: +6.5 ±1.7 at the age of 379 ±6 Ma. The U-Pb SHRIMP age data demonstrate the concordance of all studied baddeleyite samples and the absence of a significant age difference between baddeleyites of the carbonatite phase: 379 ±3 and foscorites: 379 ±4 Ma. The weighted average age for all the studied baddeleyite samples (n = 8) is 379 ±2.4 Ma at MSWD of 0.6. This can also indicate a relatively short time-interval of magmatism in the formation of Kovdor polyphase massif which did not exceed 5 m.y. and could be related to the Devonian mantleplume activity.
DS201801-0067
2017
Rodionov, N.V.Sorokhtina, N.V., Belyatsky, B.V., Kononkova, N.N., Rodionov, N.V., Lepkhina, E.N., Antonov, A.V., Sergeev, S.A.Pyrochlore group minerals from Paleozoic carbonatite massifs of the Kola Peninsula: composition and evolution.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 20-21.Russia, Kola Peninsulacarbonatites

Abstract: Chemical composition and evolution of pyrochlore-group minerals (Nb?Ta?Ti) from the early phoscorites and calcite carbonatites, and late rare-earth dolomite carbonatites from Seblyavr and Vuorijarvi Paleozoic massifs have been studied. There are two trends in pyrochlore composition evolution: the change of U, Ti, and Ta enriched varieties by calcium high-Nb, and the change of early calcium varieties by barium-strontium pyrochlores. The substitutions are described by the typical reactions: 2Ti4+ + U4+ ? 2Nb5+ + Ca2+; Ta5+ ? Nb5+; U4+ + v (vacancy) ? 2Ca2+. The Ca ranges in pyrochlores are explained by isomorphic occupation of the cation position A with Ba, Sr, and REE, the total concentration of which increases as the carbonatite melt evolved and reaches a maximum in rare-earth dolomite carbonatites. The formation of barium pyrochlore is mainly due to successive crystallization from the Ba and Sr enriched melt (oscillatory zoning crystals), or with the secondary replacement of grain margins of the calcium pyrochlore, as an additional mechanism of formation. High enrichments in LREE2O3 (up to 6 wt.%) are identified. The fluorine content in pyrochlore group minerals varies widely. A high concentration (up to 8 wt.%) is found in central and marginal zones of crystals from calcite carbonatites, while it decreases in the pyrochlore from dolomite carbonatites. Fluorine in the crystal lattice has sufficient stability during cation-exchange processes and it is not lost in the case of developing of late carbonatites over the earlier ones. In the late mineral populations the relics enriched by this component are observed. There is a positive correlation of fluorine with sodium. The marginal and fractured zones of pyrochlore crystals from all rock types are represented by phases with a cation deficiency in position A and an increased Si. The evolution of mineral composition depends on the alkaline-ultramafic melt crystallization differentiation, enrichment of the late melts by alkalis and alkaline earth metals at the high fluorine activity. It is determined that the fluorine sharply increases from the early pyroxenites to the carbonatite rocks of the massif. The foscorites and carbonatites of the early stages of crystallization are the most enriched in fluorine, while the late dolomite carbonatites are depleted by this component and enriched in chlorine and water. The fluorine saturation of the early stages of carbonatite melting leads to the formation of fluorapatite and pyrochlore minerals which are the main mineralsconcentrators of fluorine. Pyrochlore group minerals from the Paleozoic carbonatite complexes of the Kola Peninsula are characterized by decreasing Pb, Th and U, and Th/U ratios in the transition from the early foscorites to later calcite carbonatites and hydrothermal dolomite carbonatites. The pyrochlore age varies within the 420-320 m.y. interval (U-Pb SHRIMPII data), while the rocks of the earliest magmatic stages has an individual grain age of 423 ± 15 Ma, but pyrochlore ages for calcite and dolomite carbonatites are younger: 351 ± 8.0 Ma and 324 ± 6.1 Ma, respectively. Such a dispersion of the age data is apparently associated with a disturbed Th/U ratio due to high ability for cation-exchange processes of pyrochlore crystalline matrix including secondary transformations. The research was done within the framework of the scientific program of Russian Academy of Sciences and state contract K41.2014.014 with Sevzapnedra.
DS1996-1279
1996
Rodkin, M.Semenov, V.Y., Rodkin, M.Conductivity structure of the upper mantle in an active subduction zoneJournal of Geodynamics, Vol. 21, No. 4, July pp. 355-364.Russia, Sakhalin IslandSubduction, Geophysics - seismics
DS1996-1200
1996
Rodkin, M.V.Rodkin, M.V., Rodnikov, A.G.Origin and structure of back arc basins: new dat a and model discussionPhysics of the Earth Plan. Interiors, Vol. 96, pp. 123-131GlobalBasins -back arc, Structure
DS1996-1200
1996
Rodnikov, A.G.Rodkin, M.V., Rodnikov, A.G.Origin and structure of back arc basins: new dat a and model discussionPhysics of the Earth Plan. Interiors, Vol. 96, pp. 123-131GlobalBasins -back arc, Structure
DS200812-0039
2008
Rodonov, N.V.Antonov, A.V., Belyatsky, B.V., Savva, E.V., Rodonov, N.V., Sergeev, S.A.Hydrothermal zircon from Proterozoic carbonatite massif.Goldschmidt Conference 2008, Abstract p.A29.Russia, KareliaTiksheozero
DS200912-0637
2009
Rodonov, N.V.Rodonov, N.V., Belyatsky, B.V., Antonov, A.V., Presnyakov, S.L., Sergeev, S.A.Baddeleyite U Pb shrimp II age determination as a tool for carbonatite massifs dating.Doklady Earth Sciences, Vol. 428, 1, pp. 1166-1170.RussiaCarbonatite
DS1996-1201
1996
Rodrigues, B.D.Rodrigues, B.D., Stanley, W.D., Williams, J.M.Axial structures within the Reelfoot Rift delineated with magnetotelluricsurveys.United States Geological Survey (USGS) Prof. Paper, No. 1538-K, 30p.Michigan, Wisconsin, Arkansas, MidcontinentGeophysics - magnetotellurics, Tectonics, structure
DS1992-0146
1992
Rodrigues, I.Bosch, M., Rodrigues, I.North Venezuelan collisional crustal block: the boundary between the Caribbean and South American platesJournal of South American Earth Sciences, Vol. 6, No. 3, October pp. 133-144VenezuelaTectonics
DS202009-1655
2020
Rodrigues, P.C.R.Roseiro, J., Figueiras, J., Rodrigues, P.C.R., Mateus, A.M.Nb-bearing mineral phases in the Bailundo carbonatite complex ( Angola): implications of Nb geochemistry in metallogenesis.Communicacoes Geologicas *** in PORT, researchgate 7p. PdfAfrica, Angoladeposit - Bailundo

Abstract: Pyrochlore group minerals are common accessory phases in alkaline-carbonatitic complexes, and the most important Nb ore worldwide. Its capacity to embody a wide range of compositions can often provide useful insights in Nb occurrence and concentration processes. In the Bailundo Carbonatitic Complex (BCC, Angola), two major sets of pyrochlore can be distinguished: (1) magmatic/metasomatic pyrochlore in deep carbonatitic rocks, often displaying diffuse textures obliterating primary zoning, with slightly low contents in Nb2O5 (average 50 wt%), and in other chemical components (Ta, U, Na); and (2) supergene pyrochlore in the weathering profile, displaying corroded and bleached patches along microfractures (in some cases, with relics of magmatic pyrochlore), that show higher contents in Nb2O5 (up to 73 wt%), Ba and Pb. Compositional and textural variations recorded in pyrochlore crystals illustrate the geodynamic events that took place in the BCC and contributed to high Nb concentration in the weathering profile, thus being quite useful to distinguish different mineralization types and as Nb-exploration tools.
DS201112-0875
2010
Rodrigues, R.Rodrigues, R., Svisero, D.P., Coehlo, F.M., Moreira, L.A.Geologia de garimpos da regiao de Coromandel, Minas Gerais.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 68-69.South America, Brazil, Minas GeraisOverview of area
DS201412-0747
2014
Rodrigues, R.Rodrigues, R., Svizzero, D.P., Moreira, L.A., Weber, F.Aspectos geologicos de diamictitos da regiao de Coromandel.6 Simposio Brasileiro de Geologia do Diamante, Aug. 3-7, 1p. AbstractSouth America, BrazilDeposit - Coromandel
DS201412-0904
2014
Rodrigues, R.Svissero, D.V., Rodrigues, R.A intrusao kimberlitica da Fazenda da Vargem revisitada.6 Simposio Brasileiro de Geologia do Diamante, Aug. 3-7, 2p. AbstractSouth America, BrazilDeposit - Vargem
DS1984-0614
1984
Rodrigues, S.E.Rodrigues, S.E.Conserving mineral resources for the future: the case of diamond mining in southern VenezuelaIn: 12th. World Mining Congress held New Delhi, India, Nov. 19-23, Vol. 2, pp. 5.04-5.012 (8p)VenezuelaEconomics, Diamond Production
DS1994-1475
1994
Rodrigues, S.E.Rodrigues, S.E.Venezuela's mining industryNational Council for Investment Promotion, CONAPRI, 60pVenezuelaBook -table of contents, Mining industry overview
DS201012-0633
2010
Rodrigues Pinto, L.G.Rodrigues Pinto, L.G., Banik de Padua, M., Ussami, N., Vitorello, I., Lopes Padhilha, A., Braitenberg, C.Magnetotelluric deep soundings, gravity and geoid in the south Sao Francisco craton: geophysical indicators of cratonic lithosphere rejuvenation and crustal underplating.Earth and Planetary Science Letters, Vol. 297, 3-4, pp. 423-434.South America, BrazilGeophysics - magnetotellurics
DS201012-0634
2010
Rodrigues Pinto, L.G.Rodrigues Pinto, L.G., Banik de Padua, M., Ussami, N., Vitorello, I., Lopes Padhilha, A., Braitenberg, C.Magnetotelluric deep soundings, gravity and geoid in the south Sao Francisco craton: geophysical indicators of cratonic lithosphere rejuvenation and crustal underplating.Earth and Planetary Science Letters, Vol. 297, 3-4, pp. 423-434.South America, BrazilGeophysics - magnetotellurics
DS202007-1171
2020
Rodriguez, E.E.Portner, D.E., Rodriguez, E.E., Beck, S., Zandt, G., Scire, A., Rocha, M.P.Detailed structure of the subducted Nazca slab into the lower mantle derived from continent scale teleseismic P wave tomography.Journal of Geophysical Research: Solid Earth, Vol. 125, e2019JB017884.Mantle, South Americasubduction

Abstract: Nazca subduction beneath South America is one of our best modern examples of long-lived ocean-continent subduction on the planet, serving as a foundation for our understanding of subduction processes. Within that framework, persistent heterogeneities at a range of scales in both the South America and Nazca plates is difficult to reconcile without detailed knowledge of the subducted Nazca slab structure. Here we use teleseismic travel time residuals from >1,000 broadband and short-period seismic stations across South America in a single tomographic inversion to produce the highest-resolution contiguous P wave tomography model of the subducting slab and surrounding mantle beneath South America to date. Our model reveals a continuous trench-parallel fast seismic velocity anomaly across the majority of South America that is consistent with the subducting Nazca slab. The imaged anomaly indicates a number of robust features of the subducted slab, including variable slab dip, extensive lower mantle penetration, slab stagnation in the lower mantle, and variable slab amplitude, that are incorporated into a new, comprehensive model of the geometry of the Nazca slab surface to ~1,100 km depth. Lower mantle slab penetration along the entire margin suggests that lower mantle slab anchoring is insufficient to explain along strike upper plate variability while slab stagnation in the lower mantle indicates that the 1,000 km discontinuity is dominant beneath South America.
DS1920-0170
1923
Rodriguez, F.Rodriguez, F.Cruteri Generali Sulla Distribuzione Geografica Dei Giacimenti Carboniferi E Diamantiferi Nell'africa Australe Ed Orientale.Geological Society ITAL. BOLL., No. 42, PP. 235-240.South Africa, Tanzania, East AfricaGeology
DS1985-0280
1985
Rodriguez-Badiola, E.Hertogen, J., Lopez-Ruiz, J., Rodriguez-Badiola, E., Demaiffe.A Mantle Sediment Mixing Model for the Petrogenesis of a Ultrapotassic Lamproite from Southeast Spain.Eos, Vol. 66, No. 46, NOVEMBER 12, P. 1114, (abstract.).GlobalPetrology
DS201412-0748
2014
Rodriguez-Gonzales, J.Rodriguez-Gonzales, J., Negredo, A.M., Carminati, E.Slab-mantle flow interaction: influence on subduction dynamics and duration.Terra Nova, Vol. 26, 4, pp. 265-272.MantleSubduction
DS201912-2821
2019
Rodriguez-Herandez, P.Sanatmaria-Perez, D., Ruiz-Fuertes, J., Pena-Alvarez, M., Chulia-Jordan, R., Marquerno, T., Zimmer, D., Guterrez-Cano, V., Macleod, S., Gregoryanz, E., Popescue, C., Rodriguez-Herandez, P., Munoz, A.Post-tilleyite, a dense calcium silicate carbonate phase.Nature Scientific Reports, Vol. 9, 11p. PdfMantletilleyite

Abstract: Calcium carbonate is a relevant constituent of the Earth’s crust that is transferred into the deep Earth through the subduction process. Its chemical interaction with calcium-rich silicates at high temperatures give rise to the formation of mixed silicate-carbonate minerals, but the structural behavior of these phases under compression is not known. Here we report the existence of a dense polymorph of Ca5(Si2O7)(CO3)2 tilleyite above 8 GPa. We have structurally characterized the two phases at high pressures and temperatures, determined their equations of state and analyzed the evolution of the polyhedral units under compression. This has been possible thanks to the agreement between our powder and single-crystal XRD experiments, Raman spectroscopy measurements and ab-initio simulations. The presence of multiple cation sites, with variable volume and coordination number (6-9) and different polyhedral compressibilities, together with the observation of significant amounts of alumina in compositions of some natural tilleyite assemblages, suggests that post-tilleyite structure has the potential to accommodate cations with different sizes and valencies.
DS1994-0712
1994
Rodriques, A.S.Haralyi, N.L.E., Hasui, Y., Rodriques, A.S.O segundo maior diamante Brasileiro: 602 quilatesGeosciences, Vol. 13, No. 1, pp. 213-224.BrazilDiamond
DS1993-1179
1993
Rodriques, C.G.Pair, D.L., Rodriques, C.G.Late Quaternary deglaciation of the southwestern St. Lawrence Lowland, New York and Ontario.Geological Society of America Bulletin, Vol. 105, No. 9, September pp. 1151-1164.Ontario, New YorkGeomorphology, Glacial deposits
DS201312-0249
2013
Rodriques, J.Ernst, R.E., Pereira, E., Hamilton, M.A., Pisarevsky, S.A., Rodriques, J., Tasinari, C.C.G., Teixeira, W., Van-Dunem, V.Mesoproterozoic intraplate magmatic 'barcode' record of the Angola portion of the Congo craton: newly dated magmatic events at 1505 and 1110 Ma and implications for Nuna ( Columbia) supercontinent reconstructions.Precambrian Research, Vol. 230, pp. 103-118.Africa, AngolaMagmatism
DS200712-0900
2007
Rodriques da Silva Enriquez, M.A.Rodriques da Silva Enriquez, M.A., Drummond, J.Social environmental certification: sustainable development and competitiveness in the mineral industry of the Brazilian Amazon.Natural Resources Forum, Vol. 31, pp. 71-86.South America, BrazilEnvironmental - metals
DS1987-0619
1987
Rodriquez, C.O.Rodriquez, C.O., Casali, R.A., Blanca, ELPY, Cappanni, O.M.1st principle prediction of structural properties and pressure dependence of the charge density and energy gaps in diamondsPhys. St.-S-B., Vol. 143, No. 1, October pp. 539-548GlobalBlank
DS1985-0281
1985
Rodriquez badiola, E.Hertogen, J., Lopez-Ruiz, J., Rodriquez badiola, E., Demaiffe.Petrogenesis of Ultrapotassic Volcanic Rocks from Southeastern Spain: Trace Elements and Strontium-lead Isotopes.Geological Association of Canada (GAC)., Vol. 10, P. A26. (abstract.).SpainShoshonite, Lamproite
DS1997-0966
1997
Rodriquez-Iturbe, I.Rodriquez-Iturbe, I., Rinaldo, A.Fractal river basins... chance and self-organizationCambridge University of Press, 563p. $ 100.00GlobalBook - ad, River Basins
DS2003-0911
2003
RoebuckMcElroy, R.E., Nowicki, T.E., Dyck, D.R., Carlson, J.A., Todd, J.K., RoebuckThe geology of the PAnd a kimberlite, Ekati diamond mine, Canada8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractNorthwest TerritoriesKimberlite geology and economics, Deposit - Panda
DS200612-0892
2006
Roebuck, S.McElroy, R., Nowicki, T., Dyck, D., Carlson, J., Todd, J., Roebuck, S., Crawford, B., Harrison, S.The geology of the PAnd a kimberlite Ekati mine, Canada.Emplacement Workshop held September, 5p. extended abstractCanada, Northwest TerritoriesDeposit - Panda geology
DS1996-0387
1996
RoeckerDricker, I.G., Roecker, Kosarev, VinnikShear wave velocity structure of the crust mantle beneath the KolaPeninsula.Geophysical Research. Lett., Vol. 23, No. 22, Nov. 15, pp. 3389-92.Russia, Kola PeninsulaGeophysics - seismics, Structure
DS2002-1670
2002
Roecker, S.Vinnick, L., Peregoudov, D., Makeyeva, L., Oreshin, S., Roecker, S.Towards 3 D fabric in the continental lithosphere and asthenosphere: the Tien ShanGeophysical Research Letters, Vol. 16, 39, Aug. 15, 10.1029/2001GL014588ChinaGeophysics - seismics
DS1992-0984
1992
Roecker, S.W.Makeyeva, L.I., Vinnik, L.P., Roecker, S.W.Shear-wave splitting and small scale convection in the continental uppermantleNature, Vol. 358, No. 6382, July 9, pp. 144-146MantleGeodynamics, Geophysics -convection
DS1996-0388
1996
Roecker, S.W.Dricker, I.G., Roecker, S.W., Kosarev, G.L., Vinnik, L.P.Shear wave velocity structure of the crust and upper mantle beneath the Kola Peninsula.Geophysical Research. Letters, Vol. 23, No. 23, Nov. 15, pp. 3389-3392.Russia, Kola PeninsulaGeophysics - seismics, Mantle
DS1997-0187
1997
Roecker, S.W.Chen, Y.H., Roecker, S.W.Elevation of the 410 Km discontinuity beneath the central Tien Shan:evidence for a detached lith... rootGeophys. Research Letters, Vol. 24, No. 12, June 15, pp. 1531-34.ChinaDiscontinuity, Lithosphere
DS2003-0351
2003
Roecker, S.W.Dricker, I.G., Roecker, S.W.Lateral heterogeneity in the upper mantle beneath the Tibetan plateau and itsJournal of Geophysical Research, Vol. 107, 11, Nov. 6, pp. DO1 10.1029/2001JB000797China, TibetGeophysics - seismics
DS200412-0484
2003
Roecker, S.W.Dricker, I.G., Roecker, S.W.Lateral heterogeneity in the upper mantle beneath the Tibetan plateau and its surroundings from SS-S travel time residuals.Journal of Geophysical Research, Vol. 107, 11, Nov. 6, pp. DO1 10.1029/2001 JB000797China, TibetGeophysics - seismics
DS1984-0018
1984
Roedder, E.Andrawes, F., Holzer, G., Roedder, E., Gibson, E.K., Oro, J.Gas Chromatographic Analysis of Volatiles in Fluid and Gas Inclusions.Journal of Chromatography, Vol. 302, PP. 181-193.GlobalFluid Inclusions, Diamonds, Geochemistry
DS1985-0295
1985
Roedder, E.Honda, M., Reynolds, J.H., Roedder, E.Noble Gases in Diamonds from Different LocationsEos, Vol. 66, No. 46, p. 1117. abstract onlyAustralia, Brazil, Zaire, South Africa, Arkansas, South AmericaBlank
DS1987-0298
1987
Roedder, E.Honda, M., Reynolds, J.H., Roedder, E., Epstein, S.Noble gases in diamonds: occurrences of solarlike helium and neonJournal of Geophysical Research, Vol. 92, No. B12, November 10, pp. 12, 507-12, 522GlobalBlank
DS1991-1098
1991
Roedder, E.McConville, P., Reynolds, J.H., Epstein, S., Roedder, E.Implanted 3He, 4He and Xe in further studies of diamonds from westernAustraliaGeochimica et Cosmochimica Acta, Vol. 55, pp. 1977-1989AustraliaLamproites, Argyle, Ellendale, noble gases, geochronology
DS1992-1286
1992
Roedder, E.Roedder, E.Fluid inclusion evidence for immiscibility in magmatic differentiationGeochimica et Cosmochimica Acta, Vol. 56, No. 1, January pp. 5-20GlobalMagmatic differentiation, Geochemistry, diamond inclusions
DS1993-1315
1993
Roedder, E.Roedder, E.A review of recent Soviet and Western magmatic inclusion studiesRussian Geology and Geophysics, Vol. 34, No. 12, pp. 162-165.RussiaReview, Inclusions
DS1989-0940
1989
Roeder, P.L.Mariano, A.N., Roeder, P.L.Wohlerite: chemical composition, cathodoluminescence and environment ofcrystallizationCanadian Mineralogist, Vol. 27, No. 4, December pp. 709-720OntarioPrairie Lake, Alkaline Complex
DS1991-1447
1991
Roeder, P.L.Roeder, P.L., Reynolds, I.Crystallization of chromite and chromium solubility in basaltic meltsJournal of Petrology, Vol. 32, pt. 5, pp. 909-934GlobalChromite -basalts, Experimental petrology
DS1995-0059
1995
Roeder, P.L.Armstrong, K.A., Roeder, P.L., Helmstaedt, H.H.The spinel mineralogy of the C14 kimberlite, Kirkland Lake, OntarioProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 14-16.OntarioMineralogy -spinel, Deposit - C14 Kirkland Lake
DS1997-0040
1997
Roeder, P.L.Armstrong, K.A., Roeder, P.L., Helmstaedt, H.H.Composition of spinels in the Carbon 14 kimberlite, Kirkland Lake Ontario.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 454-466.OntarioGeochemistry, Deposit -C 14
DS2001-0085
2001
Roeder, P.L.Barnes, S.J., Roeder, P.L.The range of spinel compositions in terrestrial mafic and ultramafic rocksJournal Petrology, Vol. 42, No. 12, pp. 2279-2302.GlobalGeochemistry, Spinels
DS2001-0946
2001
Roeder, P.L.Poustovetov, A.A., Roeder, P.L.The distribution of chromium between basaltic melt and chromian spinel as an oxygen geobarometer.Canadian Mineralogist, Vol. 39, No. 2, Apr. pp. 309-317.MantleMelting, chromium, oxides - not specific to diamonds
DS2001-0947
2001
Roeder, P.L.Poustovetov, A.A., Roeder, P.L.Numerical modeling of major element distribution between chromian spinel and basaltic melt, MORBSContributions to Mineralogy and Petrology, Vol. 142, No. 1, Oct. pp. 58-71.MantleMORBS - chemistry
DS200612-0086
2004
Roeder, P.L.Barnes, S.J., Roeder, P.L.Database available at the following website July 1, 2005. Range of spinel compositions in terrestrial mafic and ultramafic rocks.CSiRO Zip File, GlobalGeochemistry - spinels
DS200812-0964
2008
Roeder, P.L.Roeder, P.L., Schulze, D.J.Crystallization of groundmass spinel in kimberlite.Journal of Petrology, Vol. 49, 8, August pp. 1473-1495.GlobalMineral chemistry - zoning trends
DS200812-0965
2008
Roeder, P.L.Roeder, P.L., Schulze, D.J.Crystallization of groundmass spinel in kimberlite.Journal of Petrology, Vol. 49, 8, pp. 1473-1496.Petrology
DS201012-0630
2010
Roeland, L.Robertson, C., Roeland, L.Using a girl's best friend to grow a multi million dollar aboriginal corporation Tlicho Investment Corporation.38th. Geoscience Forum Northwest Territories, Abstract pp.80-81.Canada, Northwest TerritoriesTlicho
DS1985-0160
1985
Roelandts, I.Duchesne, J.C., Roelandts, I., Demaiffe, D., Weis, D.Petrogenesis of Monzonitic Dykes in the Egerund Ogna Anorthosite (rogaland S.w. Norway): Trace Elements and Isotopic (sr Pb) Constraints.Contributions to Mineralogy and Petrology, Vol. 90, No. 2-3, PP. 214-225.Norway, ScandinaviaBlank
DS2003-0866
2003
Roelofse, F.Maier, W.D., Roelofse, F., Barnes, S.J.The concentration of the Platinum Group elements in South African komatiites:Journal of Petrology, Vol. 44, 10, pp. 1787-1804.South AfricaMagmatism - not specific to diamonds
DS200412-1205
2003
Roelofse, F.Maier, W.D., Roelofse, F., Barnes, S.J.The concentration of the Platinum Group elements in South African komatiites: implications for mantle sources, melting regime anJournal of Petrology, Vol. 44, 10, pp. 1787-1804.Africa, South AfricaMagmatism - not specific to diamonds
DS1997-0967
1997
Roelofsen, J.Roelofsen, J.The primary and secondary mafic silicates of two peralkaline anorogeniccomplexes: Strange Lake and Amba Dongar.McGill University of, MSc.Quebec, Labrador, India, QuadjaratCarbonatite, alkaline rocks
DS1995-1588
1995
Roelofsen, J.N.Roelofsen, J.N., Martin, R.F., et al.Sequential alteration of mafic minerals in fenites from the Amba Bongar carbonatitic - alkaline complex GujaratGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Annual Meeting Abstracts, Vol. 20, p. A90 AbstractIndiaCarbonatite
DS1989-1294
1989
Roelofsen-Ahl, J.N.Roelofsen-Ahl, J.N., Peterson, R.C.Gittinsite: a modification of the Thortveitite structureCanadian Mineralogist, Vol. 27, No. 4, December pp. 703-708QuebecStrange Lake, Alkaline Complex
DS1960-1016
1968
Roen, J.B.Roen, J.B.A Transcurrent Structure in Fayette and Greene CountiesUnited States Geological Survey (USGS) PROF. PAPER., No. 600-C, PP. 149-152.Appalachia, PennsylvaniaTectonics
DS1960-1017
1968
Roen, J.B.Roen, J.B.A Transcurrent Structure in Fayette and Green Counties, Pennsylvania.United States Geological Survey (USGS) PROF. PAPER., No. 600C, PP. 149-152.United States, Appalachia, PennsylvaniaTectonics, Geology
DS1990-0171
1990
Roering, C.Barton, J.M., Van Reenen, D.D., Roering, C.The significance of 3000 Ma granulite facies mafic dikes in the central zone of the Limpopo Belt.Precambrian Research, Vol. 48, pp. 299-308.Southern Africa, ZimbabweDikes, Limpopo Orogeny
DS1990-0322
1990
Roering, C.Cheney, E.S., Roering, C., de la R. Winter, H.The Archean-Proterozoic boundary in the Kaapvaal Province of SouthernAfricaPrecambrian Research, Vol. 46, No. 4, March pp. 329-340Southern AfricaProterozoic, Petrology
DS1991-0358
1991
Roering, C.De Wit, M.J., Roering, C.Formation of an Archean continent #2Terra Abstracts, Precambrian Sedimentary Basins of Southern Africa, ed., Vol. 3, suppl. 3 p. 8. AbstractSouth AfricaKaapval craton, Tectonics
DS1992-0352
1992
Roering, C.De Wit, M.J., Roering, C., Hart, R.J., Armstrong, R.A., et al.Formation of an Archean continent #1Nature, Vol. 357, No. 6379, June 18, pp. 553-562South AfricaArchean continent, Structure
DS1992-1287
1992
Roering, C.Roering, C., Van Reenen, D.D., Smit, C.A., Barton, J.M.Jr., De Beer, J.H.Tectonic model for the evolution of the Limpopo BeltPrecambrian Research, Vol. 55, pp. 539-552South AfricaTectonics, Limpopo Belt
DS1992-1593
1992
Roering, C.Van Reenen, D.D., Roering, C., Ashwal, L.D., De Wit, M.J.Regional geological setting of the Limpopo beltPrecambrian Research, Vol. 55, pp. 1-5South AfricaLimpopo Belt, Granulite terrane, craton
DS1993-1649
1993
Roering, C.Van Schalkwyk, J.F., De Wit, M.J., Roering, C., Van Reenen, D.D.Tectono-metamorphic evolution of the simatic basement of the Pietersburg greenstone belt relative to the Limpopo Orogeny: evidence from serpentinitePrecambrian Research, Vol. 61, No. 1-2, February pp. 67-88South AfricaTectonics, metamorphism, Greenstone belt
DS1995-1589
1995
Roering, C.Roering, C., Van Reenen, D.D., Smit, C.A., Du Toit, R.Deep crustal embrittlement and fluid flow during granulite metamorphism in Limpopo Belt, South AfricaJournal of Geology, Vol. 103, No. 6, pp. 673-686South AfricaTectonics, metamorphism,, Limpopo Belt
DS1860-0087
1869
Roessler, A.R.Roessler, A.R.Diamonds in Georgia. #4American Journal of MIN., Vol. 7, APRIL 3RD. P. 213.United States, GeorgiaDiamond Occurrence
DS1992-1201
1992
Roest, W.Pilkington, M., Roest, W.Draping aeromagnetic dat a in areas of rugged topographyJournal of Applied Geophysics, Vol. 29, No. 2, August pp. 135-142CanadaGeophysics - aeromagnetics, Map
DS1995-1137
1995
Roest, W.Macnab, R., Verhoef, J., Roest, W., Arkani-Hamed, J.New database documents the magnetic character of the Arctic and NorthAtlanticEos, Vol. 76, No. 45, Nov. 7, p. 449, 458Arctic, Atlantic OceanGeophysics - database
DS1990-0811
1990
Roest, W.R.Keen, C.E., Kay, W.A., Roest, W.R.Crustal anatomoy of a transform continental marginTectonophysics, Vol. 173, pp. 527-44.MantleGeophysics - seismics, magnetics
DS1990-1408
1990
Roest, W.R.Srivastava, S.P., Schouten, H., Roest, W.R., et al.Iberian plate kinetics: a jumping plate boundary between Eurasia andAfricaNature, Vol. 344, No. 6268, April 19, pp. 756-759NewfoundlandPlate tectonics, Iberian plate
DS1990-1513
1990
Roest, W.R.Verhoff, J., Usow, K.H., Roest, W.R.A new method for plate reconstructions: the use of gridded dataComputers and Geosciences, Vol. 16, No. 1, pp. 51-74GlobalComputers, Gridded data sets
DS1990-1514
1990
Roest, W.R.Verhoff, J., Usow, K.H., Roest, W.R.A new method for plate reconstructions: the use of gridded dataComputers and Geosciences, Vol. 16, No. 1, pp. 51-74.GlobalTectonics - plate, Computer - Program
DS1991-1448
1991
Roest, W.R.Roest, W.R., Rupert, J.D., Grieve, R.A.F., Goodacre, A.K.Structural aspects of North America in the context of the World Bougueranomaly mapGeological Survey of Canada Forum held January 21-23, 1990 in Ottawa, p. 14 AbstractGlobalGeophysics -Gravity, Map
DS1996-1117
1996
Roest, W.R.Pilkington, M., Roest, W.R.As assessment of long wave length magnetic anomalies over CanadaCanadian Journal of Earth Sciences, Vol. 33, No. 1, Jan. pp. 12-23.CanadaGeophysics -magnetics, Overview
DS1996-1118
1996
Roest, W.R.Pilkington, M., Roest, W.R.An assessment of long wavelength magnetic anomalies over CanadaCanadian Journal of Earth Sciences, Vol. 33, No. 1, Jan. pp. 12-23CanadaGeophysics, MAGSAT -overview
DS1997-0911
1997
Roest, W.R.Pilkington, M., Roest, W.R.Removing varying directional trends in aeromagnetic data: an example From the Slave Province.Geological Survey of Canada Forum 1997 abstracts, p. 14. AbstractNorthwest TerritoriesGeophysics - aeromagnetics
DS1998-1163
1998
Roest, W.R.Pilkington, M., Roest, W.R.Removing varying directional trends in aeromagnetic dataGeophysics, Vol. 63, No. 2, Mar-Apr, pp. 446-453.Northwest TerritoriesGeophysics - aeromagnetics, Mackenzie dyke swarm
DS1998-1164
1998
Roest, W.R.Pilkington, M., Roest, W.R.Removing varying directional trends in aeromagnetic dataGeophysics, Vol. 63, No. 2, Mar-Apr. pp. 446-53Northwest TerritoriesGeophysics - magnetics, Mackenzie dyke swarm
DS2000-0765
2000
Roest, W.R.Pilkington, M., Miles, W.F., Ross, G.M., Roest, W.R.Potential field signatures of buried Precambrian basement in the Western Canada sedimentary Basin.Canadian Journal of Earth Sciences, Vol.37, No.11, Nov.pp.1453-71.AlbertaTectonics - Precambrian, Geophysics - seismics
DS2001-0774
2001
Roest, W.R.Miles, W.F., Roest, W.R.Isostatic residual gravity anomaly map - CanadaGeological Survey of Canada (GSC) Open File, No. 4160, 1 map 1:7,500,000 $ 20.CanadaGeophysics - gravity anomaly, Map
DS2001-0813
2001
Roest, W.R.Muller, R.D., Gaina, C., Roest, W.R., KLunbek HansenA recipe for microcontinent formationGeology, Vol. 29, No. 3, Mar. pp.203-6.GreenlandPlumes, accretion, terranes, Tectonics
DS2002-0194
2002
Roest, W.R.Bourlon, E., Mareschal, J.C., Roest, W.R., Telmat, H.Geophysics correlations in the Ungava Bay areaCanadian Journal of Earth Science, Vol.39,5, May, pp.625-37.Quebec, Labrador, Baffin IslandGeophysics - gravity, magnetics, Tectonics
DS1989-0931
1989
Roethe, G.Maravic, H.v., Mortenai, G., Roethe, G.The cancrinite-syenite/carbonatite complex of Lueshe,Kivu/northeast Zaire:petrographic and geochemical studies and its economic significanceJournal of African Earth Sciences, Vol. 9, No. 2, pp. 341-355Democratic Republic of CongoCarbonatite, Geochemistry, petrography
DS200812-0226
2008
Roex, A.Coe, N., Roex, A., Gurney, J., Pearson, D.G., Nowell, G.Petrogenesis of the Swartuggens and Star Group II kimberlite dyke swarms, South Africa: constraints from whole rock geochemistry.Contributions to Mineralogy and Petrology, Vol. 156, 5, pp. 627-652.Africa, South AfricaDeposit - Swartruggens and Star
DS200712-0021
2007
Roex, A.P.Appleyard, C.M., Bell, D.R., Roex, A.P.Petrology and geochemistry of eclogite xenoliths from the Rietfontein kimberlite, northern Cape, South Africa.Contributions to Mineralogy and Petrology, Vol. 154, 3m pp. 309-333.Africa, South AfricaDeposit - Rietfontein
DS200712-0022
2007
Roex, A.P.Appleyard, C.M., Bell, D.R., Roex, A.P.Petrology and geochemistry of eclogite xenoliths from the Rietfontein kimberlite, northern Cape, South Africa.Contributions to Mineralogy and Petrology, Vol. 154, 3, pp. 309-333.Africa, South AfricaRietfontein
DS201812-2875
2018
Roffey, S.Roffey, S., Rayner, M.J., Davy, A.T., Platell, R.W.Argyle deposit: Evaluation of the AK1 deposit at Argyle diamond mine.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 65-88.Australia, western Australiadeposit - Argyle
DS200912-0459
2009
Roffey, S.L.Luguet, A., Jaques, A.I., Pearson, D.G., Smith, C.B., Bulanova, G.P., Roffey, S.L., Rayner, M.J., Lorand, J.P.An integrated petrological, geochemical and Re-Os isotope study of peridotite xenoliths from the Argyle lamproite, western Australia and implications forLithos, In press available, 64p.AustraliaGeochronology - Cratonic diamond occurrences
DS1989-1014
1989
Rog, A.M.Meurer, W.P., Falster, A.U., Simmons, W.B., Hanson, S.L., Rog, A.M.Trace mineralogy of the Magnet Cove carbonatite, ArkansawSixteenth Rochester Mineralogical Symposium, Rocks and Minerals, held April, Vol. 64, No. 6, December p. 473. Summary onlyArkansasCarbonatite, Magnet Cove
DS2000-0545
2000
Rogden, S.M.Kung, J., Rogden, S.M., Jackson, I.Silicate perovskite analogue ScALO3; temperature dependence of elastic moduli.Physical Earth and Planetary Interiors, Vol. 120, No. 4, Aug. 1, pp. 299-314.GlobalPerovskite - experimental petrology
DS1993-1319
1993
Roger, G.Rohon, M.-L., Vialette, Y., Clar, T., Roger, G., Ohnenstetter, D., Vidal, Ph.Aphebian mafic-ultramafic magmatism in the Labrador trough (New Quebec):its age and the nature of its mantle source.Canadian Journal of Earth Sciences, Vol. 30, No. 8, August pp. 1582-1593.QuebecCrustal contamination, Ultramafics
DS1960-0337
1963
Roger, T.H.Edwards, C.B., Dribble, C.D., Mcbride, B., Roger, T.H.Prospecting for Diamonds in Tanganyika 1959-1961United Nations Report, UNPUBL.Tanzania, East AfricaGeology
DS201909-2065
2019
Rogerie, G.Nabyl, Z., Massuyeau, M., Gaillard, F., Tuduri, J., Iacono-Marziano, G., Rogerie, G., Le Trong, E., Di Carlo, I., Melleton, J., Bailly, L.REE-rich carbonatites immiscible with phonolitic magma.Goldschmidt2019, 1p. AbstractGlobalcarbonatite - REE

Abstract: uncommon type of magmatic rocks dominates by carbonate, are broadly enriched in rare earth elements (REE) relative to the majority of igneous silicate rocks. While more than 500 carbonatites are referenced worldwide [1], only a few contain economic REE concentrations that are widely considered as resulting from late magmatic-hydrothermal or supergene processes. Magmatic pre-enrichment, linked to the igneous processes at the origin of carbonatites, are, however, likely to contribute to the REE fertilisation. Field observations [1] and experimental surveys [2, 3] suggest that a large part of the carbonatite melts can be produced as immiscible liquids with silicate magmas. Experimental constraints reveals that such immiscibility processes can lead to both REE enrichments and depletions in carbonatites [2, 3], making the magmatic processes controlling REE enrichments unclear. Here we present results of high-pressure and hightemperature experiments, simultaneously addressing crystal fractionation of alkaline magmas and immiscibility between carbonate and silicate melts. The experimental data reveal that the degree of differentiation, controlling the chemical composition of alkaline melts is a key factor ruling the REE concentration of the coexisting immiscible carbonatites. The parameterization of the experimental data together with the compilation of geochemical data from various alkaline provinces show that REE concentrations similar to those of highly REE enriched carbonatites (SREE > 30000 ppm) can be produced by immiscibility with phono-trachytic melt compositions, while more primitive alkaline magma can only be immiscible with carbonatites that are not significantly enriched in REE.
DS202006-0940
2020
Rogerie, G.Nabyl, Z., Massuyeau, M., Gaillard, F., Tuduri, J., Iacono-Marziano, G., Rogerie, G., Le Trong, E., Di Carlo, I., Melleton, J., Bailly, L.A window in the course of alkaline magma differentiation conducive to immiscible REE-rich carbonatites.Geochimica et Cosmochimica Acta, in press available 57p. PdfMantlecarbonatite

Abstract: Rare earth element (REE) enrichments in carbonatites are often described as resulting from late magmatic-hydrothermal or supergene processes. However, magmatic pre-enrichment linked to the igneous processes at the origin of carbonatites are likely to contribute to the REE fertilisation. Experimental constraints reveals that immiscibility processes between carbonate and silicate melts can lead to both REE enrichments and depletions in carbonatites making the magmatic processes controlling REE enrichments unclear. We link REE contents of carbonatites to the magmatic stage at which carbonatites are separated from silicate magma in their course of differentiation. We present results of experiments made at pressure and temperature conditions of alkaline magmas and associated carbonatites differentiation (0.2-1.5 GPa; 725-975?°C; FMQ to FMQ?+?2.5), simultaneously addressing crystal fractionation of alkaline magmas and immiscibility between carbonate (calcio-carbonate type) and silicate melts (nephelinite to phonolite type). The experimental data shows that the degree of differentiation, controlling the chemical composition of alkaline melts, is a key factor ruling the REE concentration of the coexisting immiscible carbonate melts. In order to predict carbonate melt REE enrichments during alkaline magma differentiation, we performed a parameterisation of experimental data on immiscible silicate and carbonate melts, based exclusively on the silica content, the alumina saturation index and the alkali/alkaline-earth elements ratio of silicate melts. This parameterisation is applied to more than 1600 geochemical data of silicate magmas from various alkaline provinces (East African Rift, Canary and Cape Verde Islands) and show that REE concentrations of their potential coeval carbonatite melts can reach concentration ranges similar to those of highly REE enriched carbonatites (?REE?>?30 000?ppm) by immiscibility with phonolitic/phono-trachytic melt compositions, while more primitive alkaline magmas can only be immiscible with carbonatites that are not significantly enriched in REE.
DS201412-0749
2014
Rogers, A.Rogers, A.Finsch - extending the life of Block 4. Resource re-estimation and block cave simulation.GSSA Kimberley Diamond Symposium and Trade Show provisional programme, Sept. 10-12, POSTERAfrica, South AfricaDeposit - Finsch
DS201605-0873
2016
Rogers, A.Mokgaotsane, M.T., Hough, T., Rogers, A., Davidson, J.Resource evaluation of the KKX36 kimberlite, central Botswana.Diamonds Still Sparkling SAIMM 2016 Conference, Mar. 14-17, pp. 27-36.Africa, BotswanaDeposit - KKX36
DS202008-1416
2018
Rogers, A.Lobatlamang, S., Brennan, M., Davidson, J., Rogers, A.Discovery of the KX36 kimberlite.Botswana Journal of Earth Sciences, Vol. 7, pp. 29-34. pdfAfrica, Botswanadeposit - KX36

Abstract: The KX36 kimberlite pipe is situated in the southeastern part of Central Kalahari Game Reserve (CKGR), Botswana, approximately 60 km from the known Gope and Kikao kimberlite fields (see figure 1).The kimberlite is covered by 75m of Kalahari sand, has a surface area of 3.6 Ha at the base of the sand cover and was discovered by Petra Diamonds Botswana (Pty) Ltd in 2008. Application of modern geophysical techniques (Ultra hi-resolution low level flying Xcalibur magnetics) and improved sampling method led to the discovery of KX36.The kimberlite was emplaced into the Karoo Supergroup, which comprised the older sedimentary rocks (300 - 185 Ma) overlain by the flood basalts (185Ma). The Karoo Supergroup rocks are overlain by approximately 80m of Kalahari Group sediments.
DS200912-0638
2009
Rogers, A.J.Rogers, A.J., Grutter, H.S.Fe rich and Na rich megacryst clinopyroxene and garnet from the Luxinga kimberlite cluster, Lunda Sul, Angola.Lithos, In press - available 30p.Africa, AngolaDeposit - Luxinga
DS201312-0398
2013
Rogers, A.J.Holder, A., Rogers, A.J., Bartlett, P.J., Keyter, G.J.Review of mud rush mitigation on Kimberley's old scraper drift block caves. DutoitspanSouth African Institute of Mining and Metallurgy, Vol. 113, July, pp. 529-538.Africa, South AfricaMining
DS201312-0749
2013
Rogers, A.J.Rogers, A.J., Hough, T.G., Davidson, J.M.KX36 - rediscovering the diamond exploration potential of the central Kalahari in Botswana.South African Institute of Mining and Metallurgy, Vol. 113, July, pp. 539-546.Africa, BotswanaGeophysics - high res gradient aeromagnetic
DS1860-1004
1897
Rogers, A.W.Rogers, A.W.Summary of Work in the South Western DistrictCape of Good Hope Geol. Comm. 2nd. Annual Report, PP. 13-14.Africa, South Africa, Cape ProvinceRegional Geology
DS1860-1100
1899
Rogers, A.W.Rogers, A.W., Schwarz, E.H.L.Report on the Southern Districts between Breede River and George. MelilititeCape of Good Hope Geol. Comm. 3rd. Annual Report, APPENDIX 3, PP. 60-64.Africa, South Africa, Cape ProvinceRegional Geology
DS1900-0035
1900
Rogers, A.W.Rogers, A.W., Schwarz, E.H.L.Geology of the Orange River Valley in the Hope Town and Prieska Districts.Cape of Good Hope Geol. Comm. 4th. Annual Report, PP. 65-97.Africa, South AfricaCurrent Activities
DS1900-0036
1900
Rogers, A.W.Rogers, A.W., Schwarz, E.H.L.The Orange River Ground MoraineSth. Afr. Phil. Soc. Transactions, Vol. 11, PT. 2, PP. 113-120.Africa, South AfricaGeomorphology
DS1900-0270
1904
Rogers, A.W.Rogers, A.W., Dutoit, A.L.The Sutherland Volcanic Pipes and Their Relationship to Other Vents in South Africa.Phil. Soc. Sth. Afr. Transactions, Vol. 15, PT. 2, PP. 61-83. ALSO: ZEITSCHR. KRYST. (LEIPZIG)Africa, South AfricaDiatremes, Non-kimberlitic, Mineralogy
DS1900-0271
1904
Rogers, A.W.Rogers, A.W., Dutoit, A.L.Geological Survey of Parts of Ceres, Sutherland and Calvinia. Volcanic Pipes of Sutherland.Cape of Good Hope Geol. Comm. 8th. Annual Report, 8TH. Annual Report, PP. 43-67.Africa, South AfricaRegional Geology, Kimberlite, Melilitite, Matzesfontein
DS1900-0351
1905
Rogers, A.W.Rogers, A.W.Geological Survey of the North Western Part of Van Rhyn's Dorp Volcanic Neck in the Kobe Valley.Cape of Good Hope Geol. Comm. 9th. Annual Report, PP. 41-43.Africa, South AfricaRegional Geology
DS1900-0352
1905
Rogers, A.W.Rogers, A.W.Geological Survey of Parts of Hay and Prieska with Some Notes on Herbert and Barkly West.Cape of Good Hope Geol. Comm. 10th. Annual Report, PP. 197-198.Africa, South AfricaRegional Geology, Kimberlite Mines And Deposits, Peiser Mine
DS1900-0353
1905
Rogers, A.W.Rogers, A.W.Introduction to the Geology of the Cape ColonyLondon: Longman, Green And Co., 1ST. EDITION, 463P. SECOND EDITION IN 1909.Africa, South AfricaRegional Geology, Kimberley Kimberlite Mines And Deposits
DS1900-0354
1905
Rogers, A.W.Rogers, A.W., Dutoit, A.L.The Volcanic Pipes of Sutherland, and Their Relation to The other Vents in South Africa.Phil. Soc. Sth. Afr. Transactions, Vol. 15, PP. 61-83. ZEITSCHR. KRYST. (LEIPZIG), Vol. 42, P.Africa, South AfricaRelated Rocks
DS1900-0447
1906
Rogers, A.W.Rogers, A.W.Geological Survey of Parts of Bechuana land and Griqualand West.Cape of Good Hope Geol. Comm. 11th. Annual Report, PP. 7-85.Africa, South AfricaDiamond Occurrence
DS1900-0448
1906
Rogers, A.W.Rogers, A.W.Diamond Bearing BrecciaCape of Good Hope Geol. Comm. 10th. Annual Report, PP. 199-200.Africa, South AfricaPeiser Mine, Petrology
DS1900-0587
1907
Rogers, A.W.Rogers, A.W.Diamondiferous Gravels at Mahura MuthlaCape of Good Hope Geol. Comm. 11th. Annual Report, PP. 76-77.Africa, South AfricaAlluvial Diamond Placers
DS1900-0699
1908
Rogers, A.W.Rogers, A.W.Geological Survey of Vryburg, Kuruman, Hay and GordoniaCape of Good Hope Geol. Comm. 12th. Annual Report, PP. 90-91.Africa, South AfricaRegional Geology, Witkop, Gordonia
DS1900-0797
1909
Rogers, A.W.Rogers, A.W.The Ecca and Beaufort Series; the Karroo Dolerites; Dyke Rocks of Uncertain Age and Kimberlite and Allied Pipes and Fissures in Carnarvon and Victoria West.Cape of Good Hope Geol. Comm. 13th. Annual Report, PP. 92-105.Africa, South Africa, Australia, Victoria WestGeology
DS1900-0798
1909
Rogers, A.W.Rogers, A.W., Dutoit, A.L.An Introduction to the Geology of the Cape ColonyLondon: Longmans, 491P.Africa, South AfricaKimberley, Geology, Regional
DS1910-0090
1910
Rogers, A.W.Rogers, A.W., Dutoit, A.L.Kimberlite and Allied Pipes and Fissures in Carnarvon and Victoria West.Cape of Good Hope Geol. Comm. 14th. Annual Report, PP. 98-103.South AfricaRegional Geology, Kimberlite Mines And Deposits
DS1910-0210
1911
Rogers, A.W.Rogers, A.W.Geological Survey of Parts of Divisions of Beaufort West, Fraserburg, victoria West, Sutherland and Laingsburg.Cape of Good Hope Geol. Comm. 15th. Annual Report, PP. 49-63.South Africa, Cape ProvinceRegional Geology
DS1910-0306
1912
Rogers, A.W.Rogers, A.W.Geological Survey of Parts of Van Rhyn's Dorp and Namaqualand Divisions.Cape of Good Hope Geol. Comm. 16th. Annual Report, PP. 61-72.South AfricaRegional Geology, Melilitites
DS1910-0472
1915
Rogers, A.W.Rogers, A.W.The Geology of Part of NamaqualandGeological Society of South Africa Transactions, Vol. 18, PP. 72-101.South AfricaRegional Geology, Melilitites
DS1910-0473
1915
Rogers, A.W.Rogers, A.W.Geitsigubib, an Old VolcanoRoyal Society. STH. AFR. Transactions (Cape Town), Vol. 5, No. 3, PP. 247-258.South AfricaRelated Rocks
DS1920-0043
1920
Rogers, A.W.Rogers, A.W.Discussion on the Paper by Dutoit Entitled the Karroo Dolerites of South Africa, a Study in Hypabyssal Injection.Geological Society of South Africa Proceedings, Vol. 23, PP. XXXVII-XXXIX.South AfricaPetrology, Basalt Emplacement
DS1920-0083
1921
Rogers, A.W.Rogers, A.W.Discussion of Paper by Harger " the Age of the South African Kimberlites".Geological Society of South Africa Proceedings, Vol. 24, P. 37.South AfricaGeochronology, Kimberlite Mines And Deposits
DS1920-0250
1925
Rogers, A.W.Rogers, A.W.The Geological Structure of the Union. an Explanation of The Geological Map of the Union of South Africa, on a Scale Of one to a Million.Pretoria: Union of South Africa, Department of Mines And Industries, 34P.South AfricaTectonics, Continental Structure
DS1920-0442
1929
Rogers, A.W.Dutoit, A.L., Rogers, A.W., Wagner, P.A.Kimberley (1929)International Geological Congress 15TH., GUIDEBOOK EXCURSION., No. AC., 34P.South Africa, Cape Province, Kimberley AreaGuidebook
DS1920-0465
1929
Rogers, A.W.Rogers, A.W., Hall, A.L., Wagner, P.A., Haughton, S.H.The Union of South AfricaHeidelberg: C. Winters Universitaetsbuchhandlung, 232P.South AfricaRegional Geology, Kimberley
DS202001-0006
2019
Rogers, C.L.Dirlam, D.M., Rogers, C.L., Weldon, R.Gemstones in the era of the Taj Mahal and the Mughals.Gems & Gemology, Vol. 55, 3, pp. 294-319.Indiahistory

Abstract: The Taj Mahal evokes an image of a monumental building and reflecting pool—its classic view. But the Taj Mahal complex is much more than that. It is actually a series of beautiful buildings and gardens in Agra, India, built in the seventeenth century in loving memory of Mumtaz Mahal. This name, given by the Mughal emperor Shah Jahan to one of his brides, means “Chosen One of the Palace.” Famed for its architectural magnificence, the landmark holds additional significance for the gemologist. Upon closer investigation, one is impressed with the intricacies of the inlay of numerous gems to create thousands of designs throughout the buildings on the grounds. This article sheds light on the gems used in decorating the Taj Mahal and in the extraordinary jewelry collected by Shah Jahan and other Mughals. These gems often took intricate trade routes to Agra, which are also discussed, along with the craft used to create the inlays and the efforts undertaken to preserve this Wonder of the World.
DS1996-0281
1996
Rogers, D.Coe, J.M., Rogers, D.Marine debris... sources, impacts and solutionsSpringer Verlag, 416p. approx. 80.00GlobalBook - ad, Marine debris
DS1989-1459
1989
Rogers, G.Storey, M., Rogers, G., Saunders, A.D., Terrell, D.J.San Quintin volcanic field, Baja California, Mexico:within plate magmatism following ridge subductionTerra Nova, Vol. 1, No. 2, pp. 195-202CaliforniaLherzolite, Mantle
DS1991-0725
1991
Rogers, G.Hole, M.J., Rogers, G., Saunders, A.D., Storey, M.Relation between alkalic volcanism and slab-window formationGeology, Vol. 19, No. 6, June pp. 657-660California, British ColumbiaAlkalic volcanism., Tectonics, Geochemistry
DS1995-0814
1995
Rogers, G.Hole, M.J., Saunders, A.D., Rogers, G., Sykes, M.A.The relationship between alkaline magmatism, lithospheric extension and slab window formation...Geological Society of London Special Paper, Volcanism Association extension consuming, No. 81, pp. 265-285.AntarcticaPlate margins, Slab subduction
DS1999-0566
1999
Rogers, G.Preston, R.J., Dempster, T.J., Rogers, G.The petrology of melilite bearing peraluminous xenoliths: implications for contamination processes..Journal of Petrology, Vol. 40, No. 4, Apr. 1, pp. 549-574.GlobalMagma - basalts, Xenolith
DS2000-0280
2000
Rogers, G.C.Fallows, S.J., Spence, G.D., Rogers, G.C.Upper crustal velcocity structure of the southwestern Canadian Cordillera from explosion recordings -seismicPure and Applied Geophys., Vol. 158, No. 9, Sept. pp. 1315-36.British Columbia, CordilleraGeophysics - seismics
DS1993-1529
1993
Rogers, H.J.J.Stettler, E.H., Coetzee, H., Rogers, H.J.J.The Schiel alkaline complex: geological setting and geophysicalinvestigation.South African Journal of Geology, Vol. 96, No. 3, Sept. pp. 96-107.South AfricaCarbonatite, Schiel complex
DS2000-0863
2000
Rogers, Hawkesworth et al.Schaefer, B.F., Turner, S.P., Rogers, Hawkesworth et al.Rhenium- Osmium (Re-Os) isotope characteristics of postorogenic lavas: implications for nature of young lithospheric mantle...Geology, Vol. 28, No. 6, June pp. 563-6.Colorado Plateau, Tibet, SpainGeochronology - potassic lavas, Mantle depletion - basaltic magmas
DS1970-0593
1972
Rogers, J.Rogers, J., Summerhayes, C.P., Dingle, R.V., Birch, G.F., Bremme.Distribution of Minerals on the Seabed Around South Africa And Problems in Their Exploration and Eventual Exploitation.Eng. Com. Oceanogr. Res. Symposium Held Stellenbosch, S71, 8P.Southwest Africa, NamibiaDiamonds, Mining Methods
DS1975-0607
1977
Rogers, J.Rogers, J.A Sedimentation on the Continental Margin Off the Orange River and the Namib Desert.Ph.d. Thesis, University Cape Town., Southwest Africa, NamibiaOffshore, Sedimentology
DS1975-0853
1978
Rogers, J.Rogers, J.Dispersal of Sediment from the Orange River Along the Namib desert Coast.International CONGRESS ON SEDIMENTOLOGY 10TH., Vol. 2, P. 552. (abstract.).Southwest Africa, NamibiaSedimentology, Geomorphology
DS1995-1590
1995
Rogers, J.Rogers, J.Lines of basement uplifts within the external parts of orogenic beltsAmerican Journal of Science, Vol. 295, April pp. 455-487AppalachiaTectonics, Craton, uplifts, Fold and thrust belts
DS2002-1350
2002
Rogers, J.Rogers, J., Li, X.C.Environmental impact of diamond mining on continental shelf sediments off southern Namibia.Quaternary International, Vol.92,1, pp. 101-12., Vol.92,1, pp. 101-12.NamibiaMining - environment
DS2002-1351
2002
Rogers, J.Rogers, J., Li, X.C.Environmental impact of diamond mining on continental shelf sediments off southern Namibia.Quaternary International, Vol.92,1, pp. 101-12., Vol.92,1, pp. 101-12.NamibiaMining - environment
DS1993-1316
1993
Rogers, J.A.Rogers, J.A.XDETECT versions 3.18 user's reference guideUnited States Geological Survey (USGS) Open File, No. 93-0261, 26p. $ 14.50GlobalComputer, Program -XDETECT.
DS1994-1062
1994
Rogers, J.H.Lubala, R.T., Frick, C., Rogers, J.H., Walraven, F.Petrogenesis of syenites and granites of the Schiel alkaline complex, Northern Transvaal, South Africa.Journal of Geology, Vol. 102, No. 3, May pp. 307-317.South AfricaAlkaline rocks -Schiel, Petrogenesis
DS1995-1591
1995
Rogers, J.J.Rogers, J.J., Unrug, R., Sultan, M.Tectonic assembly of GondwanaJournal of Geodynamics, Vol. 19, No. 1, pp. 1-34.GondwanaTectonics, Pangea assembly
DS200612-1168
2006
Rogers, J.J.Rogers, J.J., Santosh, M.The Sino-Korean Craton and supercontinent history: problems and perspectives.Gondwana Research, Vol. 9, 1-2, pp. 21-23.AsiaCraton
DS1989-1295
1989
Rogers, J.J.W.Rogers, J.J.W., Callaghan, E.J.Diapiric trandhjemites of the western Dharwar Craton, southern IndiaCanadian Journal of Earth Sciences, Vol. 26, pp. 244-256.IndiaDiapirs, Tectonics
DS1989-1296
1989
Rogers, J.J.W.Rogers, J.J.W., Rosendahl, B.R.Perceptions and issues in continental riftingJournal of African Earth Sciences, Vol. 8, No. 2/3/4, pp. 137-142AfricaTectonics, Rifting -overview
DS1989-1297
1989
Rogers, J.J.W.Rogers, J.J.W., Rosendahl, B.R.Perceptions and issues in continental riftingJournal of African Earth Sciences, Vol. 8, No. 2/3-4, pp. 137-42.East Africa, TanzaniaTectonics - rifting, plate
DS1992-1043
1992
Rogers, J.J.W.Meen, J.K., Rogers, J.J.W., Fullagar, P.D.Lead isotopic compositions of the Western Dharwar Craton, southern India:evidence for the distinct Middle Archean terranes in a Late Archean cratonGeochimica et Cosmochimica Acta, Vol. 56, No. 6, June, pp. 2455-2470IndiaGeochronology, Craton
DS1993-1317
1993
Rogers, J.J.W.Rogers, J.J.W., Unrug, R., Sultan MohammedReport of workshop on the assembly of GondwanaPreprint from authors, 64pGlobalTectonics, Gondwana, Supercontinent cycle in earth's history
DS1993-1318
1993
Rogers, J.J.W.Rogers, J.J.W., Unrug, R., Sultan, M.Report of the workshop on the assembly of GondwanaWorkshop Preprint, 64p.MantleSupercontinent cycle, Earth history
DS1994-1476
1994
Rogers, J.J.W.Rogers, J.J.W., Unrug, R., Sultan, M.Tectonic assembly of GondwanaJournal of Geodynamics, Vol. 19, No. 1, pp. 1-34GondwanaTectonics, Supercontinent
DS1995-1592
1995
Rogers, J.J.W.Rogers, J.J.W.The possible effect of a very old Archean nucleus on Mesozoic Rifting ofGondwana.Basement Tectonics 10, held Minnesota Aug 92, pp. 113-118.GondwanaTectonics, Structure
DS1996-1202
1996
Rogers, J.J.W.Rogers, J.J.W.A history of the continents in the past three billion yearsJournal of Geology, Vol. 104, No. 1, pp. 91-108MantlePlate tectonics, Gondwanaland, Pangea
DS1996-1203
1996
Rogers, J.J.W.Rogers, J.J.W.A history of the continents in the past three billion yearsJournal of Geology, Vol. 104, No. 1, pp. 91-108.MantleTectonics, Pangea, Gondwanaland
DS1997-0719
1997
Rogers, J.J.W.Mallard, L.D., Rogers, J.J.W.Relationship of Avalonian and Cadomian terranes to Grenville and Pan-African events.Journal of Geodynamics, Vol. 23, No. 3-4, pp. 197-222.Ontario, Canada, EuropeTerranes, Tectonics
DS200812-0966
2008
Rogers, J.J.W.Rogers, J.J.W., Santosh, M.Tectonics and surface effects of the supercontinent Columbia.Gondwana Research, in press, 8p.Gondwana, ColumbiaTectonics
DS1992-1288
1992
Rogers, J.W.Rogers, J.W.Contrast between an old and a young Gondwana shieldJournal of Geodynamics, Vol. 16, No. 4, December pp. 211-214GlobalCraton, World, Gondwana
DS2002-1352
2002
Rogers, J.W.Rogers, J.W.Did Rodinia have the same shape as Pangea and Columbia?Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 558.AustraliaTectonics - rifting, terranes, Gondwana
DS200912-0639
2009
Rogers, J.W.J.Rogers, J.W.J., Santosh, M.Tectonics and surface effects of the supercontinent Colombia.Gondwana Research, Vol. 15, 3-4, pp. 373-380.MantleTectonics
DS201112-0230
2011
Rogers, K.Czuppon, G., Gwalani, L.G., Demeny, A., Ramsay, R., Rogers, K., Eves, A., Szabo, Cs.C, O, H isotope compositions of the Wilmott and Yungul carbonatites and the associated fluorites in the Speewah dome, Kimberley region, Australia.Goldschmidt Conference 2011, abstract p.711.AustraliaCarbonatite
DS201012-0258
2010
Rogers, K.A.Gwalani, L.G., Rogers, K.A., Demeny, A., Groves, D.L., Ramsay, R., Beard, A., Downes, P.J., Eves, A.The Yungul carbonatite dykes associated with the epithermal fluorite deposit at Speewah, Kimberley, Australia: carbon and oxygen isotope constraints originMineralogy and Petrology, Vol. 98, 1-4, pp. 123-141.AustraliaCarbonatite
DS1994-1372
1994
Rogers, M.T.Pettibone, P.J., Rogers, M.T.Russian mineral lawsEngineering and Mining Journal, Vol. 195, No. 7, July pp. WW 26-28RussiaLegal, Mining Laws
DS1994-1373
1994
Rogers, M.T.Pettibone, P.J., Rogers, M.T.Russian mineral lawsEngineering and Mining Journal, Vol. 195, No. 7, July p. WW 26, 27, 28.Russia, Commonwealth of Independent States (CIS)Legal, Mineral laws
DS1984-0615
1984
Rogers, N.Rogers, N., Hawkesworth, C.New Date for DiamondsNature., Vol. 310, No. 5974, JULY 19TH. PP. 187-188.GlobalGenesis, Origin
DS1987-0469
1987
Rogers, N.Menzies, M.A., Rogers, N., Tindle, A., Hawkesworth, C.J.Metasomatic and enrichment processes in lithospheric peridotites, an effectof asthenosphere-lithosphere interactionIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 313-364GlobalBlank
DS1996-1374
1996
Rogers, N.Stewart, K., Rogers, N.Mantle plume and lithosphere contributions to basalts from southernEthiopiaEarth and Planetary Science Letters, Vol. 140, pp. 195-211GlobalBasalts, Mantle plumes
DS2001-0712
2001
Rogers, N.Macdonald, R., Rogers, N., Fitton, J.G., Black, SmithPlume lithosphere interactions in the generation of the basalts of the Kenya rift, east Africa.Journal of Petrology, Vol. 42, No. 5, pp. 877-900.East Africa, KenyaTectonics - plume, mantle
DS200812-0967
2008
Rogers, N.Rogers, N.Mantle lithosphere in basalts from the Kenya Rift.Goldschmidt Conference 2008, Abstract p.A803.Africa, KenyaBasanites, Foidites
DS1975-0173
1975
Rogers, N.W.Rogers, N.W., Nixon, P.H.Geochemistry of Lower Crustal Granulite Xenoliths from Lesotho Kimberlites.Leeds University Research Institute of African Geology Annual Report, Vol. 19, PP. 38-41.LesothoMineral Chemistry
DS1975-0608
1977
Rogers, N.W.Rogers, N.W.Granulite Xenoliths from Lesotho Kimberlites and the Lower Continental crust.Nature., Vol. 270, No. 5639, PP. 681-684.LesothoPetrography
DS1980-0261
1980
Rogers, N.W.Nixon, P.H., Mitchell, R.H., Rogers, N.W.Petrogenesis of Alnoitic Rocks from Malaita, Solomon Islands,melansia.Mineralogical Magazine., Vol. 43, No. 329, MARCH PP. 587-596.GlobalPetrography
DS1981-0317
1981
Rogers, N.W.Nixon, P.H., Rogers, N.W., Gibson, I.L., Grey, A.Depleted and Fertile Mantle Xenoliths from Southern Africankimberlites.Annual Review of Earth and Planetary Science, Vol. 9, PP. 285-309.South AfricaKimberlite Genesis
DS1982-0265
1982
Rogers, N.W.Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W., Menzies.Neodymium and Strontium Isotope Studies on Crustal Xenoliths from southernafrica.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 236, (abstract.).South Africa, LesothoKimberlite, Geochronology
DS1982-0526
1982
Rogers, N.W.Rogers, N.W., Hawkesworth, C.J.Proterozoic Age and Cumulate Origin for Granulite Xenoliths, Lesotho.Nature., Vol. 299, No. 5882, PP. 409-412.LesothoKimberlite, Geochronology, Genesis
DS1982-0527
1982
Rogers, N.W.Rogers, N.W., Hawkesworth, C.J.Proterozoic Age and Cumulate Origin for Granulite Xenoliths, LesothoNature, Vol. 299, No. 5882, October 6th. pp. 409-413LesothoBlank
DS1984-0349
1984
Rogers, N.W.Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W.C., Menzies.Mantle Enrichment ProcessesNature., Vol. 311, No. 6984, SEPT. 27TH. PP. 331-335.GlobalBasanite, Kimberlite, Genesis
DS1985-0275
1985
Rogers, N.W.Hawkesworth, C.J., Fraser, K.J., Rogers, N.W.Kimberlites and lamproites: extreme products of mantleenrichmentprocessesTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 439-447AustraliaLamproites, Review
DS1986-0349
1986
Rogers, N.W.Hawkesworth, C.J., Van Calsteren, P., Palacz, Z., Rogers, N.W.Crustal xenoliths from southern Africa: chemical and age variations within the continental crustProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 253-255South Africa, LesothoBlank
DS1987-0281
1987
Rogers, N.W.Hawkesworth, C.J., Kempton, P.D., Palacz, Z., Rogers, N.W.Mantle lithosphere as a source of continental flood basaltsEos, Vol. 68, No. 44, November 3, p. 1549. abstract onlyGlobalBlank
DS1987-0282
1987
Rogers, N.W.Hawkesworth, C.J., Van Calsteren, P., Rogers, N.W., Menzies, M.A.Isotope variations in recent volacnics: a trace element perspectiveIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 365-388GlobalBlank
DS1987-0620
1987
Rogers, N.W.Rogers, N.W., Hawkesworth, C.J., Mattey, D.P., Harmon, R.S.Sediment subduction and the source of potassium in orogenic leucititesGeology, Vol. 15, No. 5, May pp. 451-453GlobalLeucite, Ultrapotassic rocks
DS1988-0293
1988
Rogers, N.W.Hawkesworth, C.J., Kempton, P.D., Mattey, D.P., Palacz, Z.A., Rogers, N.W.Intra-mantle fractionation VS lithosphere recycling:evidence from the sub-continental mantleD. Reidel Publishing Co., Nato Series, Asi C, Math. Phys. Sci., Vol., pp. 227-237Southern AfricaIsotopes- kimberlites, lamproites, Mid Ocean Ridge Basalt (MORB).
DS1989-1298
1989
Rogers, N.W.Rogers, N.W., Ellam, R.M., Peate, D.W., Hawkesworth, C.J.Potassic mafic rocks from the Virunga and the Karoo and the composition Of the subcontinental mantleNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 225 Abstract held June 25-July 1Central AfricaTectonics, Rift
DS1989-1299
1989
Rogers, N.W.Rogers, N.W., Hawkesworth, C.J., Ormerod, D.S., Kempton, P.D.Sampling the lithosphere. Discussion and replyNature, Vol. 342, December 14, p. 743GlobalMantle, Xenoliths
DS1989-1300
1989
Rogers, N.W.Rogers, N.W., Marsh, J.S.Mantle xenoliths and Archean basalts from South Africa: implications for local heterogeneity in the ArcheanmantleLpi Technical Report, No. 89-05, pp. 75-78South AfricaMantle xenoliths
DS1990-0678
1990
Rogers, N.W.Hawkesworth, C.J., Kempton, P.D., Rogers, N.W., Ellam, R.M.Continental mantle lithosphere, and shallow level enrichment processes In the earth's mantleEarth and Planetary Science Letters, Vol. 96, No.3-4, pp. 256-268South AfricaMantle, Xenoliths, lamproites, kimb
DS1990-1142
1990
Rogers, N.W.Ormerod, D.S., Rogers, N.W., Hawkesworth, C.J.Coherent melting relationships in the lithospheric mantle by inverse modelling of alkali basaltsV.m. Goldschmidt Conference Held May 2-4, 1990, Program And Abstract, p. 71. Abstract onlyGlobalMantle, Geochemistry
DS1991-1273
1991
Rogers, N.W.Osmerod, D.S., Rogers, N.W., Hawkesworth, C.J.Melting in the lithospheric mantle: inverse modelling of alkali-olivinebasalts from the Big Pine volcanic field, CaliforniaContributions to Mineralogy and Petrology, Vol. 108, pp. 305-317CaliforniaMantle, Basalts
DS1992-1289
1992
Rogers, N.W.Rogers, N.W.Potassic magmatism as a key to trace element enrichment processes in The upper mantleJournal of Volcanology and geothermal research, Vol. 50, No. 1/2, April 15, pp. 85-100MantleGeochemistry -potassic magmatism
DS1992-1290
1992
Rogers, N.W.Rogers, N.W., Demulder, M., Hawkesworth, C.J.An enriched mantle source for potassic basanites- evidence from Karisimbivolcano, Virunga volcanic province, RwandaContributions to Mineralogy and Petrology, Vol. 111, No. 4, September pp. 543-556GlobalBasanite
DS1992-1291
1992
Rogers, N.W.Rogers, N.W., Hawkesworth, C.J., Palacz, Z.A.Phlogophite in the generation of olivine melilitites from Namaqualand, South Africa and implications for element fractionation processes in the uppermantle.Lithos, Vol. 28, No. 3-6. November pp. 347-365.South AfricaMelilitites, Petrology
DS1995-1460
1995
Rogers, N.W.Pearson, D.G., Rogers, N.W., Irving, A.J., Smith, C.B.Source regions of kimberlites and lamproites: constraints from Rhenium- Osmium (Rhenium- Osmium (Re-Os))isotopes.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 430-432.South AfricaGeochronology, Lamproites
DS1995-1593
1995
Rogers, N.W.Rogers, N.W., Hawkesworth, C.Late Cenozoic basaltic magmatism in the western Great Basin, California andNevada.Journal of Geophysical Research, Vol. 100, No. B6, June 10, pp. 10, 287-10, 302.CaliforniaMagmatism
DS2002-0553
2002
Rogers, N.W.George, R.M., Rogers, N.W.Plume dynamics beneath the African plate inferred from the geochemistryContribution to Mineralogy and Petrology, Vol. 143, 5, pp.Mantle, AfricaTectonics, hotspots
DS200712-0407
2007
Rogers, N.W.Hammond, S.J., Parkinson, I.J., James, R.H., Rogers, N.W., Harvey, J.Delta 7 Li systematics of mantle xenoliths from Kilbourne Hole: unravelling metasomatic and differential processes.Plates, Plumes, and Paradigms, 1p. abstract p. A373.United States, New Mexico, Colorado PlateauMetasomatism
DS200712-0895
2007
Rogers, N.W.Riches, A.J.V., Rogers, N.W., Charlier, B.L.A., Bodinier, J-L.A reappraisal of the petrology and origins of the Lherz peridotite.Plates, Plumes, and Paradigms, 1p. abstract p. A838.EuropeMantle composition
DS1990-0689
1990
Rogers, P.Hickmott, D.D., Sorensen, S., Rogers, P.Trace element abundances in minerals from a metasomatized garnet-amphibolite Catalin a schist ,southern CaliforniaGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A349CaliforniaGeochemistry, Pixie trace elements
DS1989-1301
1989
Rogers, R.D.Rogers, R.D.Use of observational patterns in geologyGeology, Vol. 17, No. 2, February pp. 131-134GlobalDatabase interpretive, Plate tectonics
DS2002-1353
2002
Rogers, R.D.Rogers, R.D., Karason, H., Van der Hilst, R.D.Epeirogenic uplift above a detached slab in northern Central AmericaGeology, Vol. 30, 11, Nov. pp. 1031-4.Nicaragua, Honduras, El Salvador, GuatemalaTectonics - subduction zones ( not specific to diamonds
DS1981-0353
1981
Rogers, W.P.Rogers, W.P.Letter to the Editor in Favor of Underground MineMurfreesboro Diamond., JUNE 25TH, 2P.United States, Gulf Coast, Arkansas, PennsylvaniaProspecting News Item
DS200712-0901
2007
Rogerson, C.M.Rogerson, C.M.Second economy versus informal economy: a South African affair.Geoforum, Vol. 38, 6, Nov. pp. 1053-1057.Africa, South AfricaEconomics
DS1986-0225
1986
Rogerson, R.J.Evans, D.J., Rogerson, R.J.Glacial geomorphology and chronology in the Selamiut Range Nachvak Fiordarea Torngat Mountains.Canadian Journal of Earth Sciences, Vol. 23, pp. 66-76.Quebec, LabradorGeomorphology
DS2003-0558
2003
Rogge, D.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's high arctic: application of hyper spectral Data31st Yellowknife Geoscience Forum, p. 37. (abst.Nunavut, Baffin IslandRemote sensing - hyperspectral
DS200412-0796
2003
Rogge, D.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's high arctic: application of hyper spectral Data.31st Yellowknife Geoscience Forum, p. 37. (abst.Canada, Nunavut, Baffin IslandRemote sensing - hyperspectral
DS200612-0536
2006
Rogge, D.Harris, J.R., Ponomarev, P., Shang, S., Budkewitsch, P., Rogge, D.A comparison of automatic and supervised methods for extracting lithological end members from hyper spectral data: application to southern Baffin Island, Nunavut.Geological Survey of Canada Current Research, 2006-C4 19p.Canada, NunavutHyperspectral - technology
DS200612-0537
2005
Rogge, D.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's Arctic: application of hyper spectral dat a using the minimum noise fraction transformation and matched filtering.Canadian Journal of Earth Sciences, Vol. 41, 12, Dec. pp. 2173-2193.Canada, Nunavut, Baffin IslandMapping - hyperspectral, lithology
DS201508-0377
2015
Rogge, D.Tappert, M.C., Rivard, B., Fulop, A., Rogge, D., Feng, J., Tappert, R., Stalder, R.Characterizing kimberlite dilution by crustal rocks at the Snap Lake diamond mine ( Northwest Territories, Canada) using SWIR ( 1.90-2.36 um) and LWIR ( 8.1-11.1um) hypersprectal imagery collected from drill core.Economic Geology, Vol. 110, 6, Sept-Oct. pp. 1375-1387.Canada, Northwest TerritoriesDeposit - Snap Lake
DS201512-1918
2015
Rogge, D.Feng, J., Tappert, M.C., Rivard, B.A., Fulop, A., Rogge, D., Tappert, R.Acquiring crustal dilution dat a and kimberlite compositional information from drill core using SWIR hyper spectral imagery from the Tango extension kimberlite.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 39.Canada, Northwest TerritoriesDeposit - Tango

Abstract: Short-wave infrared (SWIR, 1.90-2.36 µm) hyperspectral imagery collected from 171 meters of drill core from the diamondiferous Tango Extension kimberlite using a high spatial resolution imaging system (pixel size: 1.43 x 1.43 µm) was analyzed to create compositional maps that show the distribution of different crustal (dilution) components and different kimberlite types along the drill core. Three types of crustal dilution components were identified in the compositional maps: carbonate, a carbonate-mudstone mixture, and mudstone. Five spectrally distinct types of kimberlite were identified, which differ mainly in their level of hydration and the amount of crustal micro-dilution they contain. Accompanying the compositional maps are depth profiles that provide quantitative abundance information for each compositional component (dilution and kimberlite). These profiles show the abundance of macro-dilution relative to kimberlite and the spatial distribution of the different kimberlite types. Using depth profiles, compositional boundaries along the length of the drill core were identified and compared to the unit boundaries from the visual lithological log. The boundaries identified using the hyperspectral imagery correlate well with the boundaries recorded during visual logging. This study demonstrates that hyperspectral imagery is well suited to the task of mapping the distribution of spectrally distinct kimberlite types, and quantifying kimberlite micro- and macro-dilution by crustal rocks.
DS1990-1255
1990
Roggensack, K.Roggensack, K., Barreiro, B., Stoiber, R.E., Glascock, M.D.Mantle heterogeneity in northwest New England as shown by MesozoiclamprophyresGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A255GlobalCamptonite, Mantle
DS2003-1442
2003
Roggensack, K.Walker, J.A., Roggensack, K., Patino, L.C., Cameron, B.I., Matias, O.The water and trace element contents of melt inclusions across an active subductionContributions to Mineralogy and Petrology, Vol. 146, 1, pp. 62-77.MantleSubduction - water
DS2003-1443
2003
Roggensack, K.Walker, J.A., Roggensack, K., Patino, L.C., Cameron, B.I., Matias, O.The water and trace element contents of melt inclusions across an active subductionContributions to Mineralogy and Petrology, Vol. 10.1007/s00410-003-0432-xMantleBlank
DS200412-2072
2003
Roggensack, K.Walker, J.A., Roggensack, K., Patino, L.C., Cameron, B.I., Matias, O.The water and trace element contents of melt inclusions across an active subduction zone.Contributions to Mineralogy and Petrology, Vol. 146, 1, pp. 62-77.MantleSubduction - water
DS1986-0715
1986
Roggenth, W.M.Scofield, N., Roggenth, W.M.Petrologic evolution of plagioclase rich cumulates from the Wichita Mountains Oklahoma, effects upon magnetic remanencepropertiesGeology, Vol. 14, No. 11, pp. 908-911GlobalUSA, Geophysics
DS1996-1204
1996
Rognon, P.Rognon, P.Climatic change in the African deserts between 130, 000 and 10, 000 y BPC.r. Academy Of Science Paris, Vol. 323, 11a pp. 549-561.AfricaGeomorphology, Climates
DS1996-1205
1996
Rognon, P.Rognon, P.Climatic change in the African deserts between 130, 000 and 10, 000 y BPC.r. Academy Of Science Paris, Vol. 323, 11a, pp. 549-561AfricaPaleoclimatology, Geomorphology
DS202012-2246
2020
Rogov, Y.Rogov, Y., Kremenets, V., Sapozhnikov, M., Sebele, M.Application of tagged neutron method for detecting diamonds in kimberlite.Instruments, Vol. 4, 4, doi.org/103390/ instruments4040033Globalneutron technology

Abstract: The results of testing a prototype of a separator for detecting diamonds in kimberlite ore using tagged neutron method are discussed. Kimberlite ore was irradiated with fast tagged neutrons with an energy of 14.1 MeV. The elemental content of the tray with kimberlite ore was determined. The criterion for detecting diamond was the presence of excess carbon concentration in a certain region of a kimberlite sample.
DS201604-0590
2015
Rogov, Yu.N.Alexakhin, V.Yu., Bystritsky, V.M., Zamyatin, N.I., Zubarev, E.V., Krasnoperov, A.V., Rapatsky, V.L., Rogov, Yu.N., Sadovsky, A.B., Salamatin, A.V., Salmin, R.A., Sapozhnikov, M.G., Slepnev, V.M., Khabarov, S.V., Razinkov,E.A., Tarasov, O.G., Nikitin,G.M.Detection of diamonds in kimberlite by the tagged neutron method.Nuclear Instruments and Methods in Physics Research Section A., A785, pp. 9-13.TechnologyMethodology

Abstract: A new technology for diamond detection in kimberlite based on the tagged neutron method is proposed. The results of experimental researches on irradiation of kimberlite samples with 14.1-MeV tagged neutrons are discussed. The source of the tagged neutron flux is a portable neutron generator with a built-in 64-pixel silicon alpha-detector with double-sided stripped readout. Characteristic gamma rays resulting from inelastic neutron scattering on nuclei of elements included in the composition of kimberlite are registered by six gamma-detectors based on BGO crystals. The criterion for diamond presence in kimberlite is an increased carbon concentration within a certain volume of the kimberlite sample.
DS1995-1028
1995
Rogovoi, V.V.Kruchkov, A.I., Kharkiv, A.D., Rogovoi, V.V.Dynamic effect of traps on kimberlites: identification of kimberliteklippen.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 305-306.Russia, YakutiaKlippen -blocks of kimberlite, Deposit -Pdtrappovaya, Jubilee, Alakit
DS1998-0192
1998
Rogozhin, A.A.Bushev, A.G., Portnov, A.M., Rogozhin, A.A., et al.Photoluminescent mineral haloes around kimberlite pipesIma 17th. Abstract Vol., p. A125, abstractRussia, ArkangelskMineralogy, Photoluminesence
DS200712-0499
2006
Rogozhina, I.Kaban, M.K., Rogozhina, I., Trubitsyn, V.Importance of lateral viscosity variations in the whole mantle for modelling of the dynamic geoid and surface velocities.Journal of Geodynamics, in press availableMantleGeodynamics, viscoity, flow
DS201312-0704
2013
Rogozhina, I.Petrunin, A.G., Kaban, M.K., Rogozhina, I., Trubitsyn, V.Revising the spectral method as applied to modeling mantle dynamics.Geochemistry, Geophysics, Geosystems: G3, Vol. 14, 9, pp. 3691-3702.MantleGeophysics - spectral
DS201806-1237
2018
Rogozhina, I.Osei Tutu, A., Sobolev, S.V., Steinberger, B., Popov, A.A., Rogozhina, I.Evaluating the influence of plate boundary friction and mantle viscosity on plate velocities.Geochemistry, Geophysics, Geosystems, Vol. 19, 3, pp. 642-666.Mantlegeophysics - seismic
DS1995-1594
1995
Rohatgi, S.Rohatgi, S., et al.DAINTY - a screen editor for dat a entryComputers and Geosciences, Vol. 21, No. 10, pp. 1139-1162GlobalComputers, Program -DAINTY
DS202006-0917
2020
Rohitha, S.Dushyantha, N., Batapola, N., Ilankoon, I.M.S.K., Rohitha, S., Premasiri, R., Abeysinghe, B., Ratnayake, N., Dissanayake, K.The story of rare earth elements ( REES): occurrences, global distribution, genesis, geology, mineralogy and global production.Ore Geology Reviews, Vol. 122, 17p. PdfGlobalREE

Abstract: Rare earth elements (REEs) including fifteen lanthanides, yttrium and scandium are found in more than 250 minerals, worldwide. REEs are used in various high-tech applications across various industries, such as electrical and electronics, automotive, renewable energy, medical and defence. Therefore, the demand for REEs in the global market is increasing day by day due to the surging demand from various sectors, such as emerging economies, green technology and R&D sectors. Rare earth (RE) deposits are classified on the basis of their genetic associations, mineralogy and form of occurrences. The Bayan Obo, Mountain Pass, Mount Weld and China’s ion adsorption clays are the major RE deposits/mines in the world to date and their genesis, chronology and mineralogy are discussed in this review. In addition, there are other RE deposits, which are currently being mined or in the feasibility or exploration stages. Most of the RE resources, production, processing and supply are concentrated in the Asia-Pacific region. In this regard, China holds the dominancy in the RE industry by producing more than 90% of the current rare earth requirements. Thus, REEs are used as a powerful tool by China in trade wars against other countries, especially against USA in 2019. However, overwhelming challenges in conventional RE explorations and mining make secondary RE resources, such as electric and electronic waste (e-waste) and mine tailings as promising resources in the future. Due to the supply risk of REEs and the monopoly of the REEs market, REEs recycling is currently considered as an effective method to alleviate market fluctuations. However, economical and sustainable processing techniques are yet to be established to exploit REEs via recycling. Moreover, there are growing ecological concerns along with social resistance towards the RE industry. To overcome these issues, the RE industry needs to be assessed to maintain long-term social sustainability by fostering the United Nations sustainable development goals (SDGs).
DS201507-0312
2015
Rohling, E.Gernon, T.M., Spence, S., Trueman, C.N., Taylor, R.N., Rohling, E., Hatter, S.J., Harding, I.C.Emplacement of Cabezo Maria lamproite volcano (Miocene) SE Spain.Bulletin of Volcanology, Vol. 77, 6, pp. 52-Europe, SpainLamproite
DS201604-0608
2016
Rohling, E.J.Gernon, T.M., Hincks, T.K., Tyrell, T., Rohling, E.J., Palmer, M.R.Snowball Earth ocean chemistry driven by extensive ridge volcanism during Rodinia breakup.Nature Geoscience, Vol. 9, 3, pp. 242-248.Gondwana, RodiniaAlkalic

Abstract: During Neoproterozoic Snowball Earth glaciations, the oceans gained massive amounts of alkalinity, culminating in the deposition of massive cap carbonates on deglaciation. Changes in terrestrial runoff associated with both breakup of the Rodinia supercontinent and deglaciation can explain some, but not all of the requisite changes in ocean chemistry. Submarine volcanism along shallow ridges formed during supercontinent breakup results in the formation of large volumes of glassy hyaloclastite, which readily alters to palagonite. Here we estimate fluxes of calcium, magnesium, phosphorus, silica and bicarbonate associated with these shallow-ridge processes, and argue that extensive submarine volcanism during the breakup of Rodinia made an important contribution to changes in ocean chemistry during Snowball Earth glaciations. We use Monte Carlo simulations to show that widespread hyaloclastite alteration under near-global sea-ice cover could lead to Ca2+ and Mg2+ supersaturation over the course of the glaciation that is sufficient to explain the volume of cap carbonates deposited. Furthermore, our conservative estimates of phosphorus release are sufficient to explain the observed P:Fe ratios in sedimentary iron formations from this time. This large phosphorus release may have fuelled primary productivity, which in turn would have contributed to atmospheric O2 rises that followed Snowball Earth episodes.
DS2000-0825
2000
Rohm, A.H.E.Rohm, A.H.E., Snieder, R., Goes, S., Trampert, J.Thermal structure of continental upper mantle inferred from S wave velocity and surface heat flow.Earth and Planetary Science Letters, Vol.181, No.3, Sept.15, pp.395-407.MantleGeothermometry, Geophysics - seismics
DS1982-0528
1982
Rohn, K.H.Rohn, K.H.South to the OzarksJewelry Making Gems And Minerals, No. 542, PP. 44-47; PP. 50-51.United States, Gulf Coast, Arkansas, PennsylvaniaDiamond Occurrences
DS201907-1529
2017
Rohner, D.Berman, N., Couttenir, M., Rohner, D., Thoenig, M.This mine is mine! How minerals fuel conflict in Africa.American Economic Review, Vol. 107, 6, pp. 1564-1610. pdfAfricalegal

Abstract: We combine georeferenced data on mining extraction of 14 minerals with information on conflict events at spatial resolution of 0.5 degree x 0.5 degree for all of Africa between 1997 and 2010. Exploiting exogenous variations in world prices, we find a positive impact of mining on conflict at the local level. Quantitatively, our estimates suggest that the historical rise in mineral prices (commodity super-cycle) might explain up to one-fourth of the average level of violence across African countries over the period. We then document how a fighting group's control of a mining area contributes to escalation from local to global violence. Finally, we analyze the impact of corporate practices and transparency initiatives in the mining industry.
DS1993-1319
1993
Rohon, M.-L.Rohon, M.-L., Vialette, Y., Clar, T., Roger, G., Ohnenstetter, D., Vidal, Ph.Aphebian mafic-ultramafic magmatism in the Labrador trough (New Quebec):its age and the nature of its mantle source.Canadian Journal of Earth Sciences, Vol. 30, No. 8, August pp. 1582-1593.QuebecCrustal contamination, Ultramafics
DS1993-1154
1993
Rohr, C.O'Brien, P.J., Rohr, C., Okrusch, M., Patzak, M.Eclogite facies relics and a multistage breakdown in metabasites of the KTB pilot hole, northeast Bavaria: implications for the Variscan tectonometamorphic evolContributions to Mineralogy and Petrology, Vol. 112, pp. 261-278GlobalEclogites, metamorphism
DS201112-0053
2011
RohrbachBallhaus, C., Laurenz, V., Fonseca, R., Munker, C., Albarede, Rohrbach, Schmidt, Jochum, Stoll, Weis, HelmyLate volatile addition to Earth.Goldschmidt Conference 2011, abstract p.475.MantleW and Cr elements
DS200512-0909
2005
Rohrbach, A.Rohrbach, A., Schuth, S., Ballhaus, C., Munker, C., Matveev, S., Qopoto, C.Petrological constraints on the origin of arc picrites, New Georgia Solomon Islands.Contributions to Mineralogy and Petrology, Vol. 149, 6, pp. 685-712.Asia, Solomon IslandsPicrite
DS200512-0951
2004
Rohrbach, A.Schuth, S., Rohrbach, A., Munker, C.Geochemical constraints on the petrogenesis of arc picrites and basalts, New Georgia Group, Solomon Islands.Contributions to Mineralogy and Petrology, Vol. 148, 3, pp. 288-311.Indonesia, Solomon IslandsGeochemistry - picrites
DS200712-0902
2006
Rohrbach, A.Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P.Ferric ferrous iron ratios in upper mantle minerals.Geochimica et Cosmochimica Acta, In press availableMantleChemistry - iron
DS200712-0903
2007
Rohrbach, A.Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P., Kamenetsky, V.S., Kuzmin, D.V.Metal saturation in the upper mantle.Nature, Vol. 449, no. 7161, Sept. 27, pp.456-458.MantleOxygen fugacity
DS200712-0904
2007
Rohrbach, A.Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P., Schonbohm, D.Metal saturation in the upper mantle.Plates, Plumes, and Paradigms, 1p. abstract p. A848.MantleOxygen fugacities
DS200912-0640
2009
Rohrbach, A.Rohrbach, A., Schmidt, M.W., Ballhaus, C.Carbonate stability in the Earth's lower mantle and redox melting across the 660 km discontinuity.Goldschmidt Conference 2009, p. A1113 Abstract.MantleMelting
DS201112-0876
2011
Rohrbach, A.Rohrbach, A., Ballhaus, C., Ulmer, P., Golla-Schindler, U., Schnbohm, D.Experimental evidence for a reduced metal saturated upper mantle.Journal of Petrology, Vol. 52, 4, pp. 717-737.MantleRedox
DS201112-0877
2011
Rohrbach, A.Rohrbach, A., Schmidt, M.W.Redox freezing and melting of carbonates in the deep mantle and the role of transient carbides.Goldschmidt Conference 2011, abstract p.1743.MantleCarbonatite
DS201112-0878
2011
Rohrbach, A.Rohrbach, A., Schmidt, M.W.Redox freezing and melting in the Earth's deep mantle resulting from carbon-iron redox coupling.Nature, March 23, 3p.MantleGeophysics - seismics, subduction
DS201212-0627
2012
Rohrbach, A.Schmidt, M.W., Rohrbach, A., Gao, C., Connolly, J.A.D.The role of redox equilibration temperatures during carbon transfer in the mantle and the stability of carbides in the mantle.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleRedox
DS201312-0053
2013
Rohrbach, A.Ballhaus, C., Laurenz, V., Munker, C., Fonseca, R.O.C., Albarede, F., Rohrbach, A., Lagos, M., Schmidt, M.W., Jochum, K-P., Stoll, B., Weis, U., Helmy, H.M.The U /Pb ratio of the Earth's mantle - a signature of late volatile addition.Earth and Planetary Interiors, Vol. 362, pp. 237-245.MantleMelting
DS201312-0750
2013
Rohrbach, A.Rohrbach, A.Redox processes in the Earth's mantle.Goldschmidt 2013, AbstractMantleRedox
DS201312-0973
2013
Rohrbach, A.Wijbrans, C.H., Klemme, S., Rohrbach, A.Experimental study of majorite stability in chromium rich garnets.Goldschmidt 2013, 1p. AbstractTechnologyGarnet
DS201412-0750
2014
Rohrbach, A.Rohrbach, A., Ghosh, S., Schmidt, M.W., Wijnrans, C.H., Klemme, S.The stability of Fe-Ni carbides in the Earth's mantle: evidence for a low Fe-Ni-C melt fraction in the deep mantle.Earth and Planetary Science Letters, Vol. 388, pp. 211-221.MantleMelting - mentions diamond
DS201501-0030
2014
Rohrbach, A.Schmidt, M.W., Gao, C., Golubkova, A., Rohrbach, A., Connolly, J.A.D.Natural moissanite ( SiC) - a low temperature mineral formed from highly fractionated ultra-reducing COH-fluids.Progress in Earth and Planetary Science, Vol. 1, pp. 27-Moissanite
DS201606-1129
2016
Rohrbach, A.Wijbrans, C.H., Rohrbach, A., Klemme, S.An experimental investigation of the stability of majoritic garnet in the Earth's mantle and improved majorite geobarometer.Contributions to Mineralogy and Petrology, Vol. 171, pp. 51-MantleGeobarometry

Abstract: The stability of the majorite component in garnet has been experimentally investigated at high pressure and high temperature, focusing on the effect of bulk composition and temperature. High-pressure experiments were performed in a multi-anvil apparatus, at pressures ranging from 6 to 14.5 GPa, and temperatures between 1400 and 1700 °C. Experiments were performed in a range of bulk compositions in the system SiO2-Al2O3-Cr2O3-CaO-MgO with varying Cr/(Cr + Al) ratios. The majorite content of garnet gradually increases with pressure, and the composition of the garnet, specifically the Cr/(Cr + Al) ratio, exerts a significant effect on the majorite substitution. We found no significant effect of temperature. We use the experimental results in combination with the literature data to derive two empirical geobarometers, which can be used to determine the equilibration pressure of natural majoritic garnets of peridotitic and eclogitic bulk compositions. The barometer for peridotitic compositions is P=-77.1+27.6×Si+1.67×Cr And the barometer for eclogitic compositions is P=-29.6+11.8×Si+7.81×Na+4.49×Ca.
DS201705-0829
2017
Rohrbach, A.Gervasoni, F., Klemme, S., Rohrbach, A., Grutzner, T., Berndt, J.Experimental constraints on mantle metasomatism caused by silicate and carbonate melt.Lithos, Vol. 282-283, pp. 173-186.MantleCarbonatite

Abstract: Metasomatic processes are responsible for many of the heterogeneities found in the upper mantle. To better understand the metasomatism in the lithospheric mantle and to illustrate the differences between metasomatism caused by hydrous silicate and carbonate-rich melts, we performed various interaction experiments: (1) Reactions between hydrous eclogite-derived melts and peridotite at 2.2-2.5 GPa and 900-1000 °C reproduce the metasomatism in the mantle wedge above subduction zones. (2) Reactions between carbonate-rich melts and peridotite at 2.5 GPa and 1050-1000 °C, and at 6 GPa and 1200-1250 °C simulate metasomatism of carbonatite and ultramafic silicate-carbonate melts in different regions of cratonic lithosphere. Our experimental results show that partial melting of hydrous eclogite produces hydrous Si- and Al-rich melts that react with peridotite and form bi-mineralic assemblages of Al-rich orthopyroxene and Mg-rich amphibole. We also found that carbonate-rich melts with different compositions react with peridotite and form new metasomatic wehrlitic mineral assemblages. Metasomatic reactions caused by Ca-rich carbonatite melt consume the primary peridotite and produce large amounts of metasomatic clinopyroxene; on the other hand, metasomatism caused by ultramafic silicate-carbonate melts produces less clinopyroxene. Furthermore, our experiments show that ultramafic silicate-carbonate melts react strongly with peridotite and cause crystallization of large amounts of metasomatic Fe-Ti oxides. The reactions of metasomatic melts with peridotite also change the melt composition. For instance, if the carbonatite melt is not entirely consumed during the metasomatic reactions, its melt composition may change dramatically, generating an alkali-rich carbonated silicate melt that is similar in composition to type I kimberlites.
DS201706-1072
2017
Rohrbach, A.Gervasoni, F., Klemme, S., Rohrbach, A., Grutzner, T., Berndt, J.Experimental constraints on the stability of baddeleyite and zircon in carbonate and silicate carbonate melts.American Mineralogist, Vol. 102, pp. 860-866.carbonatite

Abstract: Carbonatites are rare igneous carbonate-rich rocks. Most carbonatites contain a large number of accessory oxide, sulfide, and silicate minerals. Baddeleyite (ZrO2) and zircon (ZrSiO4) are common accessory minerals in carbonatites and because these minerals host high concentrations of U and Th, they are often used to determine the ages of formation of the carbonatite. In an experimental study, we constrain the stability fields of baddeleyite and zircon in Ca-rich carbonate melts with different silica concentrations. Our results show that SiO2-free and low silica carbonate melts crystallize baddeleyite, whereas zircon only crystallizes in melts with higher concentration of SiO2. We also find that the zirconsilicate baghdadite (Ca3ZrSi2O9) crystallizes in intermediate compositions. Our experiments indicate that zircon may not be a primary mineral in a low-silica carbonatite melt and care must be taken when interpreting zircon ages from low-silica carbonatite rocks.
DS201804-0697
2018
Rohrbach, A.Grutzner, T., Klemme, S., Rohrbach, A., Gerbasoni, F., Berndt, J.The effect of fluorine on the stability of wadsleyite: implications for the nature and depths of the transition zone in the Earth's mantle.Earth and Planteray Science Letters, Vol. 482, pp. 236-244.Mantletransition zone

Abstract: The Earth's mantle contains significant amounts of volatile elements, such as hydrogen (H), carbon (C) and the halogens fluorine (F), chlorine (Cl) and bromine (Br) and iodine (I). There is a wealth of knowledge about the global cycling of H and C, but there is only scant data on the concentrations of halogens in different Earth reservoirs and on the behavior of halogens during recycling in subduction zones. Here we focus on the storage potential of F in deeper parts of the Earth's mantle. The transition zone is a region in the Earth's mantle (410-660 km) known for its high water storage capacity, as the high pressure polymorphs of olivine, wadsleyite and ringwoodite are known to be able to incorporate several per-cent of water. In order to assess potential fractionation between water and F in the transition zone of the Earth's mantle, we set out to investigate the storage capacity of the halogen F in wadsleyite and olivine at transition zone conditions. Experiments were performed in a simplified mantle composition at temperatures from 1400?°C to 1900?°C and pressures from 17 up to 21 GPa in a multi anvil apparatus. The results show that F can shift the olivine-wadsleyite transition towards higher pressure. We find that F has an opposing effect to water, the latter of which extends the transition zone towards lower pressure. Moreover, the F storage capacity of wadsleyite is significantly lower than previously anticipated. F concentrations in wadsleyite range from to independent of temperature or pressure. The F storage capacity in wadsleyite is even lower than the F storage capacity of forsterite under transition zone conditions, and the latter can incorporate F under these conditions. Based on our data we find that the transition zone cannot be a reservoir for F as it is assumed to be for water. Furthermore, we argue that during subduction of a volatile-bearing slab, fractionation of water from F will occur, where water enters preferentially the transition zone and F remains in the peridotite of the lowermost upper mantle.
DS201906-1279
2019
Rohrbach, A.Bussweiler, Y., Grutzner, T., Rohrbach, A., Klenne, S.New insights into cratonic mantle metasomatism from HP-HT reaction experiments between saline fluids and mantle rocks.GAC/MAC annual Meeting, 1p. Abstract p. 67.Mantlemetasomatism

Abstract: Saline (Cl-rich) fluids potentially play an important role as metasomatic agents in the lithospheric mantle. Natural evidence for deep saline fluids exists as inclusions within diamonds and within groundmass minerals in kimberlites. Previous experimental studies have investigated melting relations in the chloride-carbonate-silicate system at upper mantle conditions, but a systematic experimental study of how saline fluids react with the lithospheric mantle is still lacking. Here, we present high-pressure, high-temperature (HP-HT) reaction experiments between a saline fluid and different mantle rocks (lherzolite, harzburgite, eclogite) at conditions corresponding to the lower cratonic lithosphere. Experiments were performed over a P-T range of 3-6 GPa and 1050-1300 °C using a multi-anvil apparatus. Preliminary results show that the interaction between saline fluid and mantle rocks is very reactive, compared to reactions with silico-carbonate melts. The reaction between saline fluid and lherzolite at 4 GPa and 1200 °C leads to extensive melting. The restite consists mainly of olivine and garnet, whereas pyroxenes are only observed as rare inclusions within garnet. In contrast, reactions between saline fluid and eclogite at 4 GPa and 1200 °C also lead to melting, but the melt is more enriched in Si. The restite consists exclusively of garnet. The experimental results demonstrate how saline fluids react with different components of the lithospheric mantle and support evolutionary models of high density fluids within diamonds.
DS1910-0091
1910
Rohrbach, P.Rohrbach, P.Luederitzbucht und Seine DiamantfelderKol. Heimat., Vol. 4, No. 2, PP. 2-3.Southwest Africa, NamibiaDiamond Occurrences, Littoral Diamond Placers
DS1910-0092
1910
Rohrbach, P.Rohrbach, P.Die Diamanten von SuedwestafrikaFrankf. Zeitung, SEPTEMBER PP. 12-14.Southwest Africa, NamibiaDiamonds
DS1996-1206
1996
Rohrman, M.Rohrman, M., Van der Beek, P.Cenozoic postrift domal uplift of North Atlantic margins: an asthenopheric diapirism model.Geology, Vol. 24, No. 10, Oct. pp. 901-904.Norway, United KingdomTectonics - rifting, Diapirs
DS2003-1176
2003
Rohrman, M.Rohrman, M., Van der Beek, P.A., Van der Hilst, R.D., Reemst, P.Timing and mechanisms of North Atlantic Cenozoic uplift: evidence for mantleGeological Society of London, Special Publication, No. 196, pp. 27-44.MantlePlumes
DS200412-1681
2003
Rohrman, M.Rohrman, M., Van der Beek, P.A., Van der Hilst, R.D., Reemst, P.Timing and mechanisms of North Atlantic Cenozoic uplift: evidence for mantle upwelling.Geological Society of London, Special Publication, No. 196, pp. 27-44.MantlePlume
DS201808-1777
2018
Rohrmuller, J.Pflander, J.A., Jung, S., Klugel, A., Munker, C., Romer, R.L., Sperner, B., Rohrmuller, J.Recurrent local melting of metasomatised lithospheric mantle in response to continental rifting: constraints from basanites and nephelinites/melilitites from SE Germany.Journal of Petrology, Vol. 59, 4, pp. 667-694.Europe, Germanymelilitites

Abstract: Cenozoic primitive basanites, nephelinites and melilitites from the Heldburg region, SE Germany, are high-MgO magmas (8•5-14•1?wt % MgO), with low SiO2 (34•2-47•1?wt %) and low to moderately high Al2O3 (9•0-15•5?wt %) and CaO (8•7-12•7?wt %). The Ni and Cr contents of most samples are up to 470?ppm and 640?ppm, respectively, and match those inferred for primary melts. In multi-element diagrams, all samples are highly enriched in incompatible trace elements with chondrite-normalised La/Yb?=?19-45, strongly depleted in Rb and K, with primitive mantle normalised K/La?=?0•15-0•72, and moderately depleted in Pb. The initial Sr-Nd-Hf isotope compositions (87Sr/86Sr?=?0•7033-0•7051, 143Nd/144Nd?=?0•51279-0•51288 and 176Hf/177Hf?=?0•28284-0•28294) fall within the range observed for other Tertiary volcanic rocks of the Central European Volcanic Province, whereas 208Pb/204Pb and 206Pb/204Pb (38•42-38•88 and 18•49-18•98) are distinctly lower at comparable 207Pb/204Pb (15•60-15•65). Trace element modelling and pressure-temperature estimates based on major element compositions and experimental data suggest that the nephelinites/melilitites formed within the lowermost lithospheric mantle, close to the lithosphere-asthenosphere boundary, by ~3-5% partial melting of a highly enriched, metasomatised, carbonated phlogopite-bearing garnet-lherzolite at temperatures?<1250?°C and pressures of ~2•8?GPa. This corresponds to a melting depth of less than ~85?km. Formation and eruption of these magmas, based on 40Ar/39Ar dating, started in the late Eocene (38•0 Ma) and lasted until the late Oligocene (25•4 Ma). Basanite eruptions occurred in the same area in the middle Miocene, about 7•7 Myr after nephelinite/melilitite generation has ceased, and lasted from 17•7 to 13•1 Ma. The basanites were generated at lower pressures (2•2-1•7?GPa) at similar temperatures (~1220-1250?°C) within the spinel stability field in the lithospheric mantle by 2-6% partial melting. Isotope and trace element systematics indicate that the lithospheric mantle source of the Heldburg magmas was affected by metasomatism associated with long-lasting subduction of oceanic and continental crust during the Variscan orogeny. Aqueous or supercritical fluids that formed at temperatures?<1000?°C and pressures of likely?>4?GPa infiltrated the thermal boundary layer at the base of the lithospheric mantle and imprinted a crustal lead isotope, and to a minor extent crustal Sr, Nd and Hf isotope signatures. They also reduced Nb/U, Ce/Pb, Lu/Hf, Sm/Nd, U/Pb and Th/Pb, but increased Rb/Sr and Nb/Ta and amplified the enrichment of LILE and LREE relative to HREE. This lead to the highly-enriched trace element patterns observed in both sample suites, and to overall less radiogenic 206Pb/204Pb and 208Pb/204Pb compared to other continental basalts in Central Europe, and to less radiogenic 176Hf/177Hf and 143Nd/144Nd that plot distinctly below the terrestrial mantle array. Temporal evolution of magmatism in the Heldburg region coincides with the changing Tertiary intraplate stress field in Central Europe, which developed in response to the Alpine orogeny. Magmatism was most probably caused in response to lithosphere deformation and perturbation of the thermal boundary layer, and not by actively upwelling asthenosphere.
DS2002-1354
2002
Rohs, C.R.Rohs, C.R., Van Schmus, W.R.Continentl growth along the southern margin of Laurentia during Late Paleoproterozoic and early Meso16th. International Conference On Basement Tectonics '02, Abstracts, 1p., 1p.OklahomaTectonics
DS2002-0088
2002
Rohtert, W.Badham, J.P.N., Rohtert, W.Unconventional diamond discoveries - Clifford's Rule is no longerTransactions of the Institution of Mining and Metallurgy, AusIMM Proceedings, Vol. 111, Sect. B., pp. B134,5. abstractOntario, Wawa, CaliforniaDiamond genesis, Model - craton
DS201412-0934
2014
Roig, J.Y.Tucker, R.D., Roig, J.Y., Moine, B., Delor, C., Peters, S.G.A geological synthesis of the Precambrian shield in Madagascar.Journal of African Earth Sciences, Vol. 94, pp. 9-30.Africa, MadagascarGeology
DS1996-1207
1996
Roisenberg, A.Roisenberg, A., Viero, P.The relationships between alkaline Mesozoic magmatism -transform faults in Rio Grande de Sul and Santa CatarinaInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 392.BrazilLamproites, Dikes
DS1993-1320
1993
Rojas, J.M.Rojas, J.M.Bolivia is ready for mining businessGlobal Business Opportunities, northwest Mining, pp. 5-26BoliviaEconomics, Mining code, investment law, environment
DS201912-2835
2019
Rojas-Agramonte, Y.Yang, Y-H., Wu, F-Y., Qiu-Li, L., Rojas-Agramonte, Y., Yang, J-H., Yang, L., Ma, Q., Xie, L-W., Huang, C., Fan, H-R., Zhao, Z-F., Xu, C.In situ U-Th-Pb dating and Sr-Nd isotope analysis of bastnasite by LA-(MC)-ICP-MS.Geostandards and Geoanalltical Research, Vol. 43, 3, pp. 543-565.China, Europe, Sweden, Asia, Mongolia, United States, Africa, Malawi, MadagascarREE

Abstract: Bastnäsite is the end member of a large group of carbonate-fluoride minerals with the common formula (REE) CO3F•CaCO3. This group is generally widespread and, despite never occurring in large quantities, represents the major economic light rare earth element (LREE) mineral in deposits related to carbonatite and alkaline intrusions. Since bastnäsite is easily altered and commonly contains inclusions of earlier-crystallised minerals, in situ analysis is considered the most suitable method to measure its U-Th-Pb and Sr-Nd isotopic compositions. Electron probe microanalysis and laser ablation (multi-collector) inductively coupled plasma-mass spectrometry of forty-six bastnäsite samples from LREE deposits in China, Pakistan, Sweden, Mongolia, USA, Malawi and Madagascar indicate that this mineral typically has high Th and LREE and moderate U and Sr contents. Analysis of an in-house bastnäsite reference material (K-9) demonstrated that precise and accurate U-Th-Pb ages could be obtained after common Pb correction. Moreover, the Th-Pb age with its high precision is preferable to the U-Pb age because most bastnäsites have relatively high Th rather than U contents. These results will have significant implications for understanding the genesis of endogenous ore deposits and formation processes related to metallogenic geochronology research.
DS2001-0527
2001
RokoskyJames, D., Rokosky, Nguuri, Gore, Niu, WebbCrustal formation in the Archean: constraints from the southern Africa seismic experiment.Slave-Kaapvaal Workshop, Sept. Ottawa, 2p. abstractSouth Africa, BotswanaGeophysics - seismics, Brief review of crustal structure studies
DS2003-0645
2003
Rokosky, J.James, D.E., Niu, F., Rokosky, J.Crustal structure of the Kaapvaal craton and its significance for early crustal evolutionLithos, Vol. 71, 2-4, pp. 413-429.South AfricaGeophysics - seismics, tectonics
DS200412-0902
2003
Rokosky, J.James, D.E., Niu, F., Rokosky, J.Crustal structure of the Kaapvaal craton and its significance for early crustal evolution.Lithos, Vol. 71, 2-4, pp. 413-429.Africa, South AfricaGeophysics - seismics, tectonics
DS201612-2326
2016
Rokosova, E.Yu.Panina, L.I., Rokosova, E.Yu., Isakova, A.T., Tolstov, A.V.Lamprophyres of the Tomto Massif: a result of mixing between potassic and sodic alkaline mafic magmas.Petrology, Vol. 24, 6, pp. 608-625.RussiaAlkalic
DS201712-2715
2017
Rokosova, E.Yu.Panina, L.I., Rokosova, E.Yu., Isakova, A.T., Tolstov, A.V.Mineral composition of alkaline lamprophyres of the Tomto massif as reflection of their genesis.Russian Geology and Geophysics, Vol. 58, pp. 887-902.Russiamonchiquites
DS1987-0621
1987
Roksandic, M.M.Roksandic, M.M.The tectonics and evolution of the Hudson Bay regionBeaumont, C., Tankard, A.J. Sedimentary Basins and basin forming, No. 12, pp. 507-518OntarioHudson Bay area, Tectonics
DS1991-0779
1991
Roksandic, Z.Jacques, A.L., Hall, A.E., Sheraton, J., Smith, C.B., Roksandic, Z.Peridotitic paragenesis planar octahedral diamonds from the Ellendale lamproite pipes, western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 202-204AustraliaEllendale, Carbon isotope, Diamond morphology
DS1994-0838
1994
Roksandic, Z.Jaques, A.L., Hall, A.E., Sheraton, J., Smith, C.B., Roksandic, Z.Peridotitic planar octahedral diamonds from the Ellendale lamproite Western Australia.Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 69-77.AustraliaDiamond morphology, Deposit -Ellendale
DS200612-1169
2006
Rolandi, V.Rolandi, V., Brajkovic, A., Adamo, I., Landonio, M.Diamonds from Udachnaya pipe, Yakutia. Their morphology, optical and Raman characteristics, FTIR and CL features.Australian Gemmologist, Vol. 22, no. 9 Jan-Mar, pp.RussiaDiamond morphology
DS201012-0072
2009
Rolandi, V.Brajkovic, A., Rolandi, V., Scotti, R.Argyle type 1a brown diamonds gemmological properties FTIR, UV-VIS, Cl and ESR features.Australian Gemmologist, Vol. 23, 12, p.AustraliaDeposit - Argyle
DS2002-0284
2002
Rolandone, F.Cheng, L.Z., Mareschal, J.C., Jaupart, C., Rolandone, F., Gariepy, C., RadigonSimultaneous inversion of gravity and heat flow data: constraints on thermal regimeJournal of Geodynamics, Vol. 34, 1, pp. 11-30.Ontario, ManitobaGeothermometry, Lithosphere - Abitibi subprovince, Thompson Belt
DS2002-1355
2002
Rolandone, F.Rolandone, F., Jaupart, C., Mareschal, J.C., Gariepy, C., Bienfait, G., CarbonneSurface heat flow, crustal temperatures and mantle heat flow in the Proterozoic TransJournal of Geophysical Research, Vol. 107, No. 12, Dec. 12, 10.1029/2001JB000698Northwest Territories, Alberta, Saskatchewan, OntarioGeothermometry, Heat flow - tectonics
DS2003-1177
2003
Rolandone, F.Rolandone, F., Mareschal, J.C., Jaupart, C., Gariepy, C., Bienfait, G., CarbonneSurface heat flow, crustal temperatures and mantle heat flow in the Proterozoic TransJournal of Geophysical Research, Vol. 107, 12, Dec. 6, pp. DO1 10.1029/2001JB000698OntarioGeothermometry
DS2003-1178
2003
Rolandone, F.Rolandone, F., Mareschal, J.C., Jaupart, C., Gosselin, C., Bienfait, G., LapointeHeat flow in the western Superior province of the Canadian ShieldJournal of Geophysical Research, Vol. 30, 12, June 15, 10.1029/2003GLO17386Ontario, Manitoba, SaskatchewanGeothermometry
DS200412-1682
2003
Rolandone, F.Rolandone, F., Mareschal, J.C., Jaupart, C., Gariepy, C., Bienfait, G., Carbonne, C., Lapointe, R.Surface heat flow, crustal temperatures and mantle heat flow in the Proterozoic Trans Hudson Orogen, Canadian Shield.Journal of Geophysical Research, Vol. 107, 12, Dec. 6, pp. DO1 10.1029/2001 JB000698Canada, OntarioGeothermometry
DS200412-1683
2003
Rolandone, F.Rolandone, F., Mareschal, J.C., Jaupart, C., Gosselin, C., Bienfait, G., Lapointe, R.Heat flow in the western Superior province of the Canadian Shield.Journal of Geophysical Research, Vol. 30, 12, June 15, 10.1029/2003 GLO17386Canada, Ontario, Manitoba, SaskatchewanGeothermometry
DS200512-0686
2005
Rolandone, F.Mareschal, J.C., Jaupart, C., Rolandone, F., Gariepy, C., Fowler, C.M., Bienfait, G., Carbonne, C., Lapointe, R.Heat flow, thermal regime, and elastic thickness of the lithosphere in the Trans-Hudson Orogen.Canadian Journal of Earth Sciences, Vol. 42, 4, April pp. 517-532.Canada, Northwest TerritoriesGeothermometry
DS200512-0846
2004
Rolandone, F.Perry, H.K.C., Jaupart, C., Mareschal, J.C., Rolandone, F., Bienfait, G.Heat flow in the Nipigon arm of the Keweenawan Rift, northwestern Ontario, Canada.Geophysical Research Letters, Vol. 31, 15,, L15607, DOI 1029/2004 GL020159Canada, OntarioGeothermometry
DS1994-0349
1994
Rolet, J.Coussement, C., Gente, P., Rolet, J., Tiercelin, J.J.The North Tanganyika hydrothermal fields, East African Rift system: their tectonic control, rift segregationTectonophysics, Vol. 237, pp. 155-173.Democratic Republic of CongoTectonics, East African Rift
DS1995-1595
1995
Rolet, J.Rolet, J., Yesou, H., Besnus, Y.Satellite image analysis of circular anomalies and fracturing networks In the Amorican MassifMapping Sciences and Remote Sensing, Vol. 32, No. 1, Jan-Mar pp. 21-43FranceRemote Sensing, Structure
DS200812-0636
2008
Rolet, J.Le Gall, B., Nonnotte, P., Rolet, J., Benoit, M., Guillou, H., Mousseau Nonnotte, M., Albaric, DeverchreRift propogation at craton margin: distribution of faulting and volcanism in the north Tanzanian divergence ( East Africa) during Neogene times.Tectonophysics, Vol. 448, 1-4, pp. 1-19.Africa, TanzaniaMagmatism
DS201212-0594
2012
Rolf, T.Rolf, T., Coltice, N.,Tackley, P.J.Linking continental drift, plate tectonics and the thermal state of the Earth's mantle.Earth and Planetary Science Letters, Vol. 351-352, pp. 134-145.MantleTectonics
DS201412-0048
2014
Rolf, T.Bello, L., Coltice, N., Rolf, T., Tackley, P.J.On the predictability limit of convection models of the Earth's mantle.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 6, pp. 2319-2328.MantleConvection
DS201901-0070
2018
Rolf, T.Rolf, T., Capitanio, F.A., Tackley, P.J.Constraints on mantle viscosity structure from continental drift histories in spherical mantle convection models.Tectonophysics, Vol. 746, pp. 339-351.Mantleplate tectonics

Abstract: Earth's continents drift in response to the force balance between mantle flow and plate tectonics and actively change the plate-mantle coupling. Thus, the patterns of continental drift provide relevant information on the coupled evolution of surface tectonics, mantle structure and dynamics. Here, we investigate rheological controls on such evolutions and use surface tectonic patterns to derive inferences on mantle viscosity structure on Earth. We employ global spherical models of mantle convection featuring self-consistently generated plate tectonics, which are used to compute time-evolving continental configurations for different mantle and lithosphere structures. Our results highlight the importance of the wavelength of mantle flow for continental configuration evolution. Too strong short-wavelength components complicate the aggregation of large continental clusters, while too stable very long wavelength flow tends to enforce compact supercontinent clustering without reasonable dispersal frequencies. Earth-like continental drift with episodic collisions and dispersals thus requires a viscosity structure that supports long-wavelength flow, but also allows for shorter-wavelength contributions. Such a criterion alone is a rather permissive constraint on internal structure, but it can be improved by considering continental-oceanic plate speed ratios and the toroidal-poloidal partitioning of plate motions. The best approximation of Earth's recent tectonic evolution is then achieved with an intermediate lithospheric yield stress and a viscosity structure in which oceanic plates are ~ 103 × more viscous than the characteristic upper mantle, which itself is ~ 100-200 × less viscous than the lowermost mantle. Such a structure causes continents to move on average ~ (2.2 ± 1.0) × slower than oceanic plates, consistent with estimates from present-day and from plate reconstructions. This does not require a low viscosity asthenosphere globally extending below continental roots. However, this plate speed ratio may undergo strong fluctuations on timescales of several 100 Myr that may be linked to periods of enhanced continental collisions and are not yet captured by current tectonic reconstructions.
DS1970-0815
1973
Rolfe, D.G.Rolfe, D.G.The Geology of the Kao Kimberlite PipesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 101-106.LesothoGeology
DS2003-1511
2003
Rolfo, F.Xu, S., Liu, Y., Chen, G., Compagnoni, R., Rolfo, F., He, M., Liu, H.New finding of microdiamonds in eclogites from Dabie Sulu region in central easternChinese Science Bulletin, Science Press, Vol. 48, 10, May, pp. 988-994.ChinaUHP, Deposit - Dabie Shan area
DS200412-1684
2004
Rolfo, F.Rolfo, F., Compagnoni, R., Wu, W., Xu, S.A coherent lithostratigraphic unit in the coesite eclogite complex of Dabie Shan China: geologic and petrologic evidence.Lithos, Vol. 73, 1-2, March pp. 71-94.ChinaUHP, metamorphism
DS200412-2159
2003
Rolfo, F.Xu, S., Liu, Y., Chen, G., Compagnoni, R., Rolfo, F., He, M., Liu, H.New finding of microdiamonds in eclogites from Dabie Sulu region in central eastern China.Chinese Science Bulletin, Vol. 48, 10, May, pp. 988-994.ChinaUHP Deposit - Dabie Shan area
DS201112-0613
2011
Rolfo, F.Liu, Y-C., Gu, X-F., Rolfo, F., Chen, Z-Y.Ultra high pressure metamorphism and multistage exhumation of eclogite of the Luotian dome, North Dabie Complex Zone: evidence from mineral inclusions -textureJournal of Asian Earth Sciences, Vol. 42, 4, pp. 607-617.Asia, ChinaUHP
DS201412-0521
2014
Rolfo, F.Liu, Y-C., Deng, L-P., Gu, X-F., Groppo, C., Rolfo, F.Application of Ti in zircon and Zr in rutile thermometers to constrain high temperature metamorphism in eclogites from the Dabie Orogen, central China.Gondwana Research, Vol. 27, pp. 410-423.ChinaEclogite
DS202009-1623
2019
Rolfo, F.Deng, L-P., Liu, Y-C., Yang, Y., Groppo, C., Rolfo, F., Gu, X-F.Anatexis of high-T eclogites in the Dabie orogen triggered by exhumation and post-orogenic collapse.European Journal of Mineralogy, Vol. 31, pp. 889-803. pdfChinaeclogite

Abstract: A combined study of detailed petrographic observation, mineral chemistry analysis and phase equilibrium modeling indicates that the high-temperature eclogites from the Dabie orogen, central China, experienced two episodes of anatexis: the first is phengite dehydration melting during the exhumation of deeply subducted slices, and the second is heating melting related to the post-orogenic collapse. Petrographic evidence and clues of the anatectic events include biotite + plagioclase + garnet ± amphibole intergrowth in matrix and biotite + plagioclase intergrowth within amphibole porphyroblast. Pressure-temperature (P-T) pseudosection and modal variation diagram indicate that the biotite + plagioclase + garnet ± amphibole in matrix was formed by the reactions phengite + clinopyroxene + quartz = melt + sanidine + garnet + plagioclase and later melt + sanidine + garnet = biotite + plagioclase, while the biotite + plagioclase intergrowths within poikiloblastic amphibole were formed by the reaction amphibole + muscovite + epidote = biotite + plagioclase + melt. In addition, the combination of petrological observations and P-T estimates suggests that the first melting event occurred at the late Triassic, while the second is related to the early Cretaceous mountain-root removal and subsequent asthenospheric upwelling and heat input. As the P-T paths of high-temperature/ultrahigh-pressure rocks have high probabilities to cross-cut phengite-melting curves, phengite melting during decompression may be a common process in these rocks. Moreover, the coexistence of multiple episodes of anatexis in a single tectonic slice suggests caution when identifying and dating partial melting in high-temperature/(ultra)high-pressure rocks.
DS202010-1834
2020
Rolim, D.R.Cordani, U.G., Colombo, C.G., Tassinari, C.G., Rolim, D.R.The basement of the Rio Apa craton in Mato Grosso do Sul ( Brazil and northern Paraguay): a geochronological correlation with the tectonic provinces of the south western craton.Researchgate, 2p. Abstract in englishSouth America, Brazil, Mato Grosso, Paraguaycraton

Abstract: The Rio Apa cratonic fragment crops out in Mato Grosso do Sul State of Brazil and in northeastern Paraguay. It comprises Paleo-Mesoproterozoic medium grade metamorphic rocks, intruded by granitic rocks, and is covered by the Neoprotero-zoic deposits of the Corumbá and Itapocumi Groups. Eastward it is bound by the southern portion of the Paraguay belt. In this work, more than 100 isotopic determina-tions, including U-Pb SHRIMP zircon ages, Rb-Sr and Sm-Nd whole-rock determina-tions, as well as K-Ar and Ar-Ar mineral ages, were reassessed in order to obtain a complete picture of its regional geological history. The tectonic evolution of the Rio Apa Craton starts with the formation of a series of magmatic arc complexes. The oldest U-Pb SHRIMP zircon age comes from a banded gneiss collected in the northern part of the region, with an age of 1950 23 Ma. The large granitic intrusion of the Alumiador Batholith yielded a U-Pb zircon age of 1839 33 Ma, and from the southeastern part of the area two orthogneisses gave zircon U-Pb ages of 1774 26 Ma and 1721 25 Ma. These may be coeval with the Alto Tererê metamorphic rocks of the northeastern corner, intruded in their turn by the Baía das Garças granitic rocks, one of them yielding a zircon U-Pb age of 1754 49 Ma. The original magmatic protoliths of these rocks involved some crustal component, as indicated by the Sm-Nd T DM model ages, between 1.9 and 2.5 Ga. Regional Sr isotopic homogenization, associated with tectonic deformation and medium-grade metamorphism occurred at approximately 1670 Ma, as suggested by Rb-Sr whole rock reference isochrons. Finally, at 1300 Ma ago, the Ar work indicates that the Rio Apa Craton was affected by widespread regional heating, when the temperature probably exceeded 350°C. Geographic distribution, age and isotopic signature of the lithotectonic units suggest the existence of a major suture separating two different tectonic domains, juxtaposed at about 1670 Ma. From that time on, the unified Rio Apa continental block behaved as one coherent and stable tectonic unit. It correlates well with the SW corner of the Amazonian Craton, where the medium-grade rocks of the Juruena-Rio Negro tectonic province, with ages between 1600 and 1780 Ma, were reworked at about 1300 Ma. Looking at the largest scale, the Rio Apa Craton is probably attached to the larger Amazonian Craton, and the actual configuration of southwestern South America is possibly due to a complex arrangement of allochthonous blocks such as the Arequipa, Antofalla and Pampia, with different sizes, that may have originated as disrupted parts of either Laurentia or Amazonia, and were trapped during later collisions of these continental masses.
DS201509-0433
2015
Rolin, P.Thiery, V., Rolin, P., Dubois, M., Caumon, M-C.Discovery of metamorphic microdiamonds from the parautochthonous units of the Variscan French Massif Central.Gondwana Research, Vol. 28, pp. 954-960.Europe, FranceMicrodiamonds

Abstract: The Variscan French Massif Central (FMC) is classically described as a stack of nappes with increasing metamorphism from the bottom (parautochthonous unit) to the top (lower and upper gneiss units). Ultra-high pressure (UHP) metamorphism was already recognized in the uppermost units, with notably coesite-bearing rocks. We report the first finding of metamorphic microdiamonds in the parautochthonous unit, revealing that the UHP event affected the whole stack of nappes and also that the pressures reached are above what was previously expected, since the presence of diamond, according to the peak temperature estimates for this unit, indicates pressures of ca. 3 GPa (i.e. 100 km depth). At the scale of the FMC, this finding adds complexity to the established models. On a broader scale, this adds evidence of similarity between this part of the belt and other UHP Variscan terranes such as the Erzgebirge and the Bohemian Massif.
DS201603-0426
2016
Rolin, P.Thiery, V., Rolin, P., Dubois, M., Caumon, M-C., Goncalves, P.Reply: Discovery of metamorphic microdiamonds from the parautochthonous units of the Variscan French Massif Central: comment.Gondwana Research, in press available 2p.EuropeMicrodiamonds
DS2003-1179
2003
Rolla, A.Rolla, A., Jamieson, H.E.Processed kimberlite water interactions in diamond mine waste, Ekati diamond mineGeological Association of Canada Annual Meeting, Abstract onlyNorthwest TerritoriesMining - waste
DS200412-1685
2003
Rolla, A.Rolla, A., Jamieson, H.E.Processed kimberlite water interactions in diamond mine waste, Ekati diamond mine, N.W.T. Canada.Geological Association of Canada Annual Meeting, Abstract onlyCanada, Northwest TerritoriesMining - waste
DS2002-1356
2002
Rolland, Y.Rolland, Y., Picard, C., Pecher, Lapierre, Bosch, KellerThe Cretaceous Ladakh arc of NW Himalaya slab melting and melt mantle interaction during fast northward driftChemical Geology, Vol.182, 2-4, Feb.15, pp.139-78.India, northwest HimalayasMelting, slab subduction, Indian Plate
DS201212-0485
2012
Rolland, Y.Monie, P., Bosch, D., Bruguier, O., Vauchez, A., Rolland, Y., Nsungani, P., Buta Neto, A.The Late Neoporterozoic/Early Paleozoic evolution of the West Congo Belt of NW Angola: geochronological (U Pb Ar Ar) and petrostructual constraints.Terra Nova, Vol. 24, 3, pp. 238-247.Africa, AngolaGeochronology
DS201212-0486
2012
Rolland, Y.Monie, P., Bosch, D., Bruguier, O., Vauchez, A., Rolland, Y., Nsungani, P., Buta Nto, A.The Late Neoproterozoic/Early Palezoic evolution of the West Congo belt of NW Angola: geochronological (U-Pb and Ar-Ar) and petrostructural constraints.Terra Nova, in press availableAfrica, AngolaGeochronology
DS201212-0595
2012
Rolland, Y.Rolland, Y., Lardeaux, J-M, Jolivet, L.Deciphering orogenic evolution.Journal of Geodynamics, Vol. 56-57, pp. 1-6.MantleTectonics
DS201212-0596
2012
Rolland, Y.Rolland, Y., Lardeaux, J-M., Jolivet, L.Deciphering orogenic evolution.Journal of Geodynamics, Vol. 56-57, pp. 1-6.MantleSubduction
DS201711-2535
2017
Rollat, A.Wall, F., Rollat, A., Pell, R.S.Responsible sourcing for critical metals.Elements, Vol. 13, pp. 313-318.Globalresources, REE

Abstract: Most critical raw materials, such as the rare-earth elements (REEs), are starting products in long manufacturing supply chains. Unlike most consumers, geoscientists can become involved in responsible sourcing, including best environmental and social practices, because geology is related to environmental impact factors such as energy requirements, resource efficiency, radioactivity and the amount of rock mined. The energy and material inputs and the emissions and waste from mining and processing can be quantified, and studies for REEs show little difference between ‘hard rocks’, such as carbonatites, and easily leachable ion-adsorption clays. The reason is the similarity in the embodied energy in the chemicals used for leaching, dissolution and separation.
DS200812-0968
2008
Rolleau, E.Rolleau, E., Stevenson, R.Contamination and heterogeneity in the mantle beneath the alkaline Montregian Province ( Quebec) evidence from geochemical and Nd Sr isotope data.Goldschmidt Conference 2008, Abstract p.A808.Canada, QuebecGeochronology
DS1960-0592
1965
Roller, J.C.Roller, J.C.Crustal Structure in the Eastern Colorado Plateau Province from Seismic refraction Measurements.Seismol. Soc. American Bulletin., Vol. 55, PP. 107-119.Colorado PlateauKimberlite, Rocky Mountains, Tectonic
DS200412-0584
2003
Roller, S.Froitzheim, N., Pleuger, J., Roller, S., Nagel, T.Exhumation of high and ultrahigh pressure metamorphic rocks by slab extraction.Geology, Vol. 31, 10, p. 925-8.Europe, AlpsUHP, metamorphism
DS1997-0980
1997
Rollet, N.Royer, J.Y., Rollet, N.Plate tectonic setting of the Tasmanian regionAustralian Journal of Earth Sciences, Vol. 44, No. 5, Oct. 1, pp. 543-560TasmaniaTectonics
DS1990-1256
1990
Rollig, G.Rollig, G., Viehweg, M., Reuter, N.The ultramafic lamprophyres and carbonatites of Delitzsch/GDR. (in German)Zeitschrift fur Angewandte Geologie, (in German), Vol. 36, No. 2, February pp. 49-53GermanyCarbonatite
DS1995-1075
1995
Rollin, K.E.Leake, R.C., Cornwell, J.D., Rollin, K.E., Styles, M.T.The potential for diamonds in BritainBritish Geological Survey Tech. Report, MRP No. 135, WF/95/1, 37p.GlobalGeology, Diamond potential
DS200712-0773
2007
RollinsonNasir, S., Al-Khirbashi, S., Al-Sayigh, Alharthy, Mubarek, Rollinson, Lazki, Belouova, Griffin, KaminskyThe first record of allochthonous kimberlite within the Batain Nappes, eastern Oman.Plates, Plumes, and Paradigms, 1p. abstract p. A706.Africa, OmanBatain melange
DS200812-0787
2008
RollinsonNasir, S., Al-Khirbash, Rollinson, Al-Harthy, Al-Sayigh, Al-Lazki, Belousa, Kaminsky, Theye, Massone, Al-BuaidiEvolved carbonatitic kimberlite from the Batain Nappes, eastern Oman continental margin.9IKC.com, 3p. extended abstractAfrica, Arabia, OmanPetrography
DS200812-0788
2008
RollinsonNasir, S., Al-Khirbash, Rollinson, Al-Harthy, Al-Sayigh, Al-Lazki, Belousa, Kaminsky, Theye, Massone, Al-BuaidiLate Jurassic Early Cretaceous kimberlite, carbonatite and ultramafic lamprophyric sill and dyke swarms from the Bomethra area, northeastern Oman.9IKC.com, 3p. extended abstractAfrica, Arabia, OmanPetrography
DS201012-0528
2010
RollinsonNasir, S., Al-Khirbash, S., Rollinson, Al-Harthy, Al-Sayigh, Al-Lazki, A., Theye, T.Massonne, BelousovaPetrogenesis of early Cretaceous carbonatite and ultramafic lamprophyres in a diatreme in the Batain Nappes, eastern Oman continental margin.Contributions to Mineralogy and Petrology, in press available, 28p.Africa, OmanCarbonatite
DS201709-2070
2017
Rollinson, G.Wall., F., Al Ali, S., Rollinson, G., Fitzpatrick, R., Dawes, W., Broom-Fendley, S.Geochemistry and mineralogy of rare earth processing.Goldschmidt Conference, abstract 1p.Africa, Malawicarbonatite - Songwe Hill

Abstract: The geochemistry and mineralogy of REE deposits is diverse, from carbonatite-related deposits, alkaline rocks, mineral sands and ion adsorption clays to potential by-products of phosphate and bauxite, and reuse of waste materials. Despite the large number of prospects that have been explored recently, very little additional REE production has started. A major challenge is to design effective, cost-efficient and environmentally-friendly processing and extraction. Processing flow sheets have to be constructed carefully for each deposit. Translating geochemistry and mineralogy studies, including quantitative mineralogy results, into processing characteristics can be illustrated using results from the Songwe Hill carbonatite, Malawi. Combining results with other published data then allows us to make some general conclusions about the common REE ore minerals and their geological environment, including the REE fluorcarbonate series, monazite and xenotime. The use of chemicals for REE extraction is often the largest environmental burden to mitigate. A new issue is that certain REE, such as Ce, are in oversupply, and are not being recovered in some proposed processing flowsheets. It will be important to understand the environmental and commercial implications of this development.
DS202101-0017
2020
Rollinson, G.Hughes, H.S.R., Compton-Jones, C., MvDonald, I., Kiseeva, E.S., Kamenetsky, V.S., Rollinson, G., Coggon, J.A., Kinnaird, J.A., Bybee, G.M.Base metal sulphide geochemistry of southern African mantle eclogites ( Roberts Victor): implications for cratonic mafic magmatism and metallogenesis.Lithos, doi.org/10.1016/ j.lithos.2020.105918 67p. PdfAfrica, South Africadeposit - Roberts Victor

Abstract: Platinum-group elements (PGE) display a chalcophile behaviour and are largely hosted by base metal sulphide (BMS) minerals in the mantle. During partial melting of the mantle, BMS release their metal budget into the magma generated. The fertility of magma sources is a key component of the mineralisation potential of large igneous provinces (LIP) and the origin of orthomagmatic sulphide deposits hosted in cratonic mafic magmatic systems. Fertility of mantle-derived magma is therefore predicated on our understanding of the abundance of metals, such as the PGE, in the asthenospheric and lithospheric mantle. Estimations of the abundance of chalcophile elements in the upper mantle are based on observations from mantle xenoliths and BMS inclusions in diamonds. Whilst previous assessments exist for the BMS composition and chalcophile element budget of peridotitic mantle, relatively few analyses have been published for eclogitic mantle. Here, we present sulphide petrography and an extensive in situ dataset of BMS trace element compositions from Roberts Victor eclogite xenoliths (Kaapvaal Craton, South Africa). The BMS are dominated by pyrite-chalcopyrite-pentlandite (± pyrrhotite) assemblages with S/Se ratios ranging 1200 to 36,840 (with 87% of analyses having S/Se this editing is incorrect. This should read "(with 87% of analyses having S/Se < 10,000)" Please note the <<10,000). Total PGE abundance in BMS range from 0.17 to 223 ppm. We recognise four end-member compositions (types i to iv), distinguished by total PGE abundance and Pt/Pd and Au/Pd ratios. The majority of BMS have low PGE abundances (< 10 ppm) but Type iv BMS have the highest concentration of PGE recorded in eclogites so far (> 100 ppm) and are characteristically enriched in Os, Ir, Ru and Rh. Nano- and micron-scale Pd-Pt antimonide, telluride and arsenide platinum-group minerals (PGM) are observed spatially associated with BMS. We suggest that the predominance of pyrite in the xenoliths reflects the process of eclogitisation and that the trace element composition of the eclogite BMS was inherited from oceanic crustal protoliths of the eclogites, introduced into the SCLM via ancient subduction during formation of the Colesberg Magnetic Lineament c. 2.9 Ga and the cratonisation of the Kaapvaal Craton. Crucially, we demonstrate that the PGE budget of eclogitic SCLM may be substantially higher than previously reported, akin to peridotitic compositions, with significant implications for the PGE fertility of cratonic mafic magmatism and metallogenesis. We quantitatively assess these implications by modelling the chalcophile geochemistry of an eclogitic melt component in parental magmas of the mafic Rustenburg Layered Suite of the Bushveld Complex.
DS201112-0803
2011
Rollinson, G.K.Pirrie, D., Rollinson, G.K.Unlocking the application of automated mineral analysis. ** not specific to diamonds.Geology Today, Vol. 27, 6, pp. 226-235.TechnologyMineralogy
DS1995-1596
1995
Rollinson, H.Rollinson, H., Blenkinsop, T.The magmatic metamorphic and tectonic evolution of the northern Marginal Zone of the Limpopo Belt in Zimbabwe.Journal of the Geological Society of London, Vol. 152, No. 1, Jan. pp. 65-76.ZimbabweTectonics, Limpopo Belt
DS1995-1597
1995
Rollinson, H.Rollinson, H., Blmkinsop, T.The magmatic, metamorphic and tectonic evolution of the northern Marginal Zone of the Limpopo Belt in ZimababweJournal of the Geological Society of London, Vol. 152, No. 1, Jan. pp. 65-76ZimbabweTectonics, Limpopo Belt
DS1997-0096
1997
Rollinson, H.Berger, M., Rollinson, H.Isotopic and geochemical evidence of crust mantle interaction during late Archean crustal growthGeochimica et Cosmochimica Acta, Vol. 61, No. 22, Nov. pp. 4809-30ZimbabweLimpopo Belt, Charnockite, enderbite
DS1997-0097
1997
Rollinson, H.Berger, M., Rollinson, H.Isotopic and geochemical evidence for crust mantle interaction during late Archean crustal growth.Geochimica et Cosmochimica Acta, Vol. 61, No. 22, pp. 4809-29.ZimbabweLimpopo Belt, Magma, Geochronology
DS1997-0968
1997
Rollinson, H.Rollinson, H.Eclogite xenoliths in west African kimberlites as residues from Archean granitoid crust formation.Nature, Vol. 389, No. 6647, Sept. 11, pp. 173-176.West AfricaEclogite
DS200612-1170
2006
Rollinson, H.Rollinson, H.Crustal generation in the Archean.Brown, M., Rushmer, T., Evolution and differentiation of the continental crust, Cambridge Publ., Chapter 6,MantleArchean
DS200612-1171
2006
Rollinson, H.Rollinson, H.Crustal generation in the Archean.Evolution and differentiation of Continental Crust, ed. Brown, M., Rushmer, T., Cambridge Univ. Press, Chapter 2, pp. 173-230.MantleGeochemistry - crustal composition
DS200712-0905
2007
Rollinson, H.Rollinson, H.Recognizing early Archean mantle: a reappraisal.Contributions to Mineralogy and Petrology, Vol. 154, 3, pp. 241-252.MantleOverview
DS200712-0906
2007
Rollinson, H.Rollinson, H.When did plate tectonics begin?Geology Today, Vol. 23, 5, pp. 186-191.MantleTectonics
DS200812-0681
2008
Rollinson, H.Lobach Zhuchenko, S.B., Rollinson, H., Chekulaev, V.P., Savatenkov, V.M., Kovalenko, A.V., Martin, H., Guseva, N.S., Arestova, N.A.Petrology of Late Archean, highly potassic, sanuktoid pluton from the Baltic Shield: insights into Late Archean mantle metasomatism.Journal of Petrology, Vol. 49, 3, pp. 393-420.Europe, Baltic shieldMetasomatism
DS200812-0969
2008
Rollinson, H.Rollinson, H.The geochemistry of mantle chromitites from the northern part of Oman ophiolite: inferred parental melt compositions.Contributions to Mineralogy and Petrology, Vol. 156, 3, pp. 273-288.DubaiGeochemistry - chromitites
DS201012-0635
2010
Rollinson, H.Rollinson, H.Coupled evolution of Archean continental crust and subcontinental lithospheric mantle.Geology, Vol. 38, 12, Dec. pp. 1083-1086.MantleSCLM - geochronology
DS201112-0723
2011
Rollinson, H.Nasir, S., Al-Khirbash, S., Rollinson, H., Al-Harthy, A., Al-Sayigh, A., Al-Lazki, A.Petrogenesis of early Cretaceous carbonatite and ultramafic lamprophryes in a diatreme in the Batain Nappes, eastern Oman continental margin.Contributions to Mineralogy and Petrology, Vol. 161, 1, pp.Africa, OmanCarbonatite
DS201112-0724
2011
Rollinson, H.Nasir, S., Al-Khirbash, S., Rollinson, H., Al-Harthy, Al-Sayigh, Al-Lazki, Theye, Massonne, BelousovaPetrogenesis of early Cretaceous carbonatite and ultramafic lamprophyres in a diatreme in the Batain Nappes, eastern Oman continental margin.Contributions to Mineralogy and Petrology, Vol. 161, 1, pp. 47-74.Asia, OmanCarbonatite
DS201112-0879
2010
Rollinson, H.Rollinson, H.Coupled evolution of Archean continental crust and subcontinental lithospheric mantle.Geology, Vol. 38, 12, Dec. pp. 1083-1086.MantleSCLM geochemistry
DS201604-0623
2016
Rollinson, H.Rollinson, H.Surprises from the top of the mantle transition zone.Geology Today, Vol. 32, 2, pp. 58-64.MantleCore, boundary

Abstract: Recent studies of chromite deposits from the mantle section of ophiolites have revealed a most unusual collection of minerals present as inclusions within the chromite. The initial discoveries were of diamonds from the Luobosa ophiolite in Tibet. Further work has shown that mantle chromitites from ophiolites in Tibet, the Russian Urals and Oman contain a range of crustal minerals including zircon, and a suite of highly reducing minerals including carbides, nitrides and metal alloys. Some of the minerals found represent very high pressure phases indicating that their likely minimum depth is close to the top of the mantle transition zone. These new results suggest that crustal materials may be subducted to mantle transition zone depths and subsequently exhumed during the initiation of new subduction zones-the most likely environment for the formation of their host ophiolites. The presence of highly reducing phases indicates that at mantle transition zone depths the Earth's mantle is "super"-reducing.
DS201705-0872
2017
Rollinson, H.Rollinson, H., Adetunji, J., Lenaz, D., Szilas, K.Archean chromitites show constant Fe3+/Efe in Earth's asthenospheric mantle since 3.8 Ga.Journal of Petrology, in press available 42p.Europe, Greenland, Africa, ZimbabweMelting, Fiskenaesset Compex, Ujaragssuit, Limpopo belt
DS201906-1343
2019
Rollinson, H.Rollinson, H.Dunites in the mantle section of the Oman ophiolite - the boninite connection.Lithos, Vol. 334-335, pp. 1-7.Asia, Oman, United Arab Emiratesboninite

Abstract: Dunites in the mantle section of the Oman ophiolite contain olivines which show both a wide range of compositions (Fo86.2 to Fo94) and very high magnesium numbers. These data are combined with experimental liquidus olivine-melt data to show that the range of olivine compositions requires that the dunites formed from a range of melt compositions and that some of these melts were very magnesian, with MgO concentrations up to MgO?=?18-20?wt%. These observations are consistent with the finding of MgO-rich melt inclusions from chromitites in the mantle section of the Oman ophiolite (Rollinson et al., Lithos, 2018). It is proposed that the high Mg-olivines formed in equilibrium with high-Ca boninites, found in the upper section of the pillow lavas sequence of the ophiolite. A model is developed whereby high MgO boninites fractionated olivine through a process of melt-rock reaction/fractionation with the enclosing harzburgite to create a range of dunitic compositions and evolved boninitic lavas. Field evidence shows that the emplacement of boninites was late in the evolution of the Oman ophiolite indicating that the mantle dunites of boninitic origin formed late in the history of the ophiolite. High-Ca boninites form through the shallow, hydrous melting of the mantle wedge in a subduction setting and the presence of boninitic dunites and lavas further supports the view that the Oman ophiolite formed in a fore-arc setting through subduction-induced spreading.
DS1975-0174
1975
Rollinson, H.R.Rollinson, H.R.Report on the Geology of Sheet 58, the Nimini Hills and Surrounding Area.Geological Survey SIERRA LEONE., UNPUBL. ReportWest Africa, Sierra LeoneRegional Geology
DS1975-0854
1978
Rollinson, H.R.Rollinson, H.R.Zonation of Supracrustal Relics in the Archaean of Sierra Leone, Liberia, Guinea and Ivory Coast.Nature., Vol. 272, No. 5632, PP. 440-442.West Africa, Sierra Leone, Liberia, Guinea, Ivory CoastStructure, Tectonics
DS1993-1321
1993
Rollinson, H.R.Rollinson, H.R.A terrane interpretation of the Archean Limpopo beltGeological Magazine, Vol. 130, No. 6, November pp. 755-765South AfricaTectonics, Limpopo Belt
DS1995-0146
1995
Rollinson, H.R.Berger, M., Rollinson, H.R.Non uniformitarian crust formation in the Archean northern marginal zone Of the Limpopo Belt.Geological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 161.ZimbabweTectonics, Limpopo Belt
DS1998-1248
1998
Rollinson, H.R.Rollinson, H.R.Crust mantle interaction during late Archean crustal growthGeological Society of America (GSA) Annual Meeting, abstract. only, p.A244.ZimbabweGeochronology, Slab melts
DS2003-0848
2003
Rollinson, H.R.Lowry, D., Appel, P.W.U., Rollinson, H.R.Oxygen isotopes of an Early Archean layered ultramafic body, southern WestPrecambrian Research, Vol. 126, 3-4, Oct. pp.273-88.GreenlandGeochronology
DS200412-1181
2003
Rollinson, H.R.Lowry, D., Appel, P.W.U., Rollinson, H.R.Oxygen isotopes of an Early Archean layered ultramafic body, southern West Greenland: implications for magma source and post intPrecambrian Research, Vol. 126, 3-4, Oct. pp.273-88.Europe, GreenlandGeochronology
DS200512-0653
2004
Rollinson, H.R.Lobach-Zhuchenko, S.B., Rollinson, H.R., Chekulaev, V.P., Arestova, N.A., Kovalenko, A.V., IvanikovThe Archean sanukitoid series of the Baltic Shield: geological setting, geochemical characteristics and implications for their origin.Lithos, Vol. 79, pp. 107-128.Baltic Shield, Kola Peninsula, RussiaGeneral regional geology, lamprophyres
DS201112-0880
2011
Rollinson, H.R.Rollinson, H.R., Whitehouse, M.The growth of the Zimbabwe Craton during the late Archean: an ion microprobe U Pb zircon study.Journal of the Geological Society, Vol. 168, pp. 941-952.Africa, ZimbabweGeochronology
DS201112-0881
2011
Rollinson, H.R.Rollinson, H.R., Whitehouse, M.The growth of the Zimbabwe craton during the late Archean: an ion microprobe U-Pb zircon study.Journal of the Geological Society, Vol. 168, pp. 941-952.Africa, Zimbabwe, South Africa, BotswanaGeochronology
DS2002-0055
2002
Rollinsonm H.R.Appel, C., Appel, P.W.U., Rollinsonm H.R.Complex chromite textures reveal the history of an early Archean layered ultramafic body in West Greenland.Mineralogical Magazine, Vol.66, 6, pp. 1029-42.GreenlandLayered intrusion
DS200912-0755
2009
Rollion-Bard, C.Thomassot, E., Cartigny, P., Harris, J.W., Lorand, J.P., Rollion-Bard, C., Chaussidon, M.Metasomatic diamond growth: a multi isotope study ( 13C, 15N, 33