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SLDRC - Harzburgite


The Sheahan Diamond Literature Reference Compilation - Scientific and Media Articles based on Major Keyword - Harzburgite
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 announcements called 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 Keyword Index
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
Each article reference in the SDLRC is tagged with one or more key words assigned by Pat Sheahan to highlight the main topics of the article. In an effort to make it easier for users to track down articles related to a specific topic, KRO has extracted these key words and developed a list of major key words presented in this Key Word Index to which individual key words used in the article reference have been assigned. In most of the individual Key Word Reports the references are in crhonological order, though in some such as Deposits the order is first by key word and then chronological. Only articles classified as "technical" (mainly scientific journal articles) and "media" (independent media articles) are included in the Key Word Index. References that were added in the most recent monthly update are highlighted in yellow.

Harzburgite is a form of peridotite comprised mainly of olivine and pyroxene.

Harzburgite
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1980-0108
1980
Delaney, J.S., Smith, J.V., Carswell, D.A., Dawson, J.B.Chemistry of Micas from Kimberlites and Xenoliths- Pt. Ii. Primary and Secondary Textured Micas from Peridotite Xenoliths.Geochimica Et Cosmochimica Acta, Vol. 44, PP. 857-872.South AfricaLherzolite, Harzburgite, Mineral Chemistry
DS1981-0132
1981
Dawson, J.B.The Nature of the Upper MantleMineralogical Magazine., Vol. 44, No. 333, PP. 1-18.GlobalKimberlite, Genesis, Harzburgite, Lherzolite, Isotope, Texture
DS1982-0171
1982
Dawson, J.B., Smith, J.V.Coarse and Veined Peridotites from Northern Tanzania Tuff ConesProceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 230, (abstract.).Tanzania, East AfricaKimberlite, Lherzolite, Harzburgite, Wehrlite, Mineralogy
DS1982-0234
1982
Gurney, J.J., Harris, J.W., Rickard, R.S.The Abundance and Chemistry of Minerals Associated with Diamonds at Roberts Victor Mine.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 200, (abstract.).South AfricaKimberlite, Chemistry, Olivine, Harzburgite, Garnet, Eclogite
DS1982-0267
1982
Hearn, B.C.JR., Mcgee, E.S.Garnet Peridotites from Williams Kimberlites, North-centralmontana, United States (us)Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 218, (abstract.).United States, Montana, Rocky MountainsKimberlite, Alnoite, Diatreme, Lherzolite, Harzburgite, Dunite
DS1982-0301
1982
Jones, A.P., Dawson, J.B., Smith, J.V.Peridotites from the Olmani Scoria Cone, Northern TanzaniaProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 221, (abstract.).Tanzania, East AfricaKimberlite, Dunite, Harzburgite, Lherzolite, Wehrlite
DS1982-0542
1982
Schieffer, J.H.Nature and Origin of Alkalic and Calcic Veinlets in Xenoliths from the Terlingua District, West Texas.Geological Society of America (GSA), Vol. 14, No. 7, P. 609, (abstract.).GlobalKimberlite, Rocky Mountains, Lherzolite, Harzburgite
DS1982-0591
1982
Sveshnikov, K.I.Formational Classification of Metabasites and Metaultrabasites Connected with the Chara Group of the Archean ( Eastern Siberia.).Soviet Geology And Geophysics, Vol. 23, No. 3, PP. 99-102.Russia, YakutiaAldan-vitim, Lherzolite, Harzburgite
DS1983-0406
1983
Lieberman, J.L., Rice, J.M.Prograde Metamorphism of Marble and Peridotite in the Seiadultramafic Complex, California.Geological Society of America (GSA), Vol. 15, N0. 4, P. 436. (abstract.).California, West CoastHarzburgite, Enstatite
DS1983-0633
1983
Whittaker, P.J., Watkinson, D.H.chromium SPINEL in the MT. SYDNEY WILLIAMS ULTRAMAFIC MASSIF, CENTRAL BRITISH COLUMBIA.Geological Association of Canada (GAC)/Mineralogical Association of, Vol. 8, P. A74, (abstract.).Canada, British ColumbiaHarzburgite, Microprobe, Alteration
DS1984-0399
1984
Kempton, P.D., Menzies, M.A., Dungan, M.A.Petrography, Petrology and Geochemistry of Xenoliths and Megacrysts from the Geronimo Volcanic Field, Southeastern Arizona.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 71-83.United States, Colorado Plateau, ArizonaHarzburgite, Lherzolite, Rare Earth Elements (ree), Websterite, Wehrlite, Mineral Chemistry
DS1984-0629
1984
Savelyeva, G.N.Mineral Assemblage Evolution in Ocean Floor UltrabasitesGeochemistry International, Vol. 21, PP. 74-86.Pacific OceanLherzolite, Harzburgite
DS1984-0767
1984
Williams, N.A.Mantle and Crustal Xenoliths from the North Hartland Dike, Vermont.Geological Society of America (GSA), Vol. 16, No. 1, P. 71. (abstract.).United States, Vermont, AppalachiaLherzolite, Harzburgite, Petrography, Microprobe
DS1985-0152
1985
Douchaeva, V.S., Borisova, V.V.Geochemistry of Basic Ultrabasic Magmatism of the Kola Peninsula.(russian)Petrol. Kriter. Otsenki Rudn. Dokembr., (Russian), Akad. Nauk SSSR Publishing, pp. 51-64RussiaWebsterite, Harzburgite, Lherzolite
DS1985-0202
1985
Frey, F.A., Suen, C.J., Stockman, H.W.The Ronda High Temperature Peridotite: Geochemistry and PetrogenesisGeochimica et Cosmochimica Acta, Vol. 49, No. 11, pp. 2469-2491GlobalWebsterite, Harzburgite, Lherzolite
DS1985-0490
1985
Neville, S.L., Schiffman, P., Sadler, P.Ultramafic Inclusions in Late Miocene Alkaline Basalts From fry and Ruby Mountains, San Bernardino County, California.American MINERALOGIST., Vol. 70, No. 7-8, PP. 668-677.United States, West Coast, CaliforniaWebsterite, Lherzolite, Harzburgite
DS1985-0552
1985
Radionov, A.S., Sobolev, N.V.A New Find of Graphite Containing Harzburgite Xenoliths Inkimberlite.(russian)Geol. Geofiz., (Russian), No. 12, pp. 32-37RussiaHarzburgite
DS1985-0764
1985
Zhdanov, V.V.Model of Metasomatic Differentiation of Upper Mantle RocksZap. Vses. Mineral. Obshch., Vol. 114, No. 1, PP. 3-13.RussiaHarzburgite, Kimberlite, Metasomatism
DS1986-0246
1986
Fisk, M.R.Basalt magma interaction with harzburgite and the formation of high magnesium andesiteGeophysical Research. Letters, Vol. 13, No. 5, May pp. 467-470GlobalHarzburgite
DS1986-0467
1986
Kuo, L.C., Essene, E.J.Petrology of spinel harzburgite xenoliths from the Kishb Plateau, SaudiArabiaContributions to Mineralogy and Petrology, Vol. 93, No. 3, pp. 335-346Saudi ArabiaHarzburgite
DS1986-0757
1986
Smith, S.B., Elthon, D.Petrogenesis of ultramafic and gabbroic rocks from the Lewis Hills Newfoundland: early stages of basalt fractionation near fracture zonesGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 755. (abstract.)NewfoundlandHarzburgite
DS1987-0700
1987
Sobornov, O.P., Zolotukhina, T.M.Radio elements in standard samples pertaining to magmatic rocks included In the single system of the USSR state standard samplesGeostandard Newsletter, Vol. 11, No. 1, pp. 123-126RussiaAnorthorosite, harzburgite, kimberlite, Spectrometry
DS1989-0998
1989
Meen, J.K., Ayers, J.C.Cryptic metasomatism and creation of melts with depleted contents of the high field strength elements:coupled effects due to infiltration of melt intoharzNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 185. AbstractGlobalHarzburgite
DS1989-1063
1989
Morten, L., Taylor, L.A., Durazzo, A.Spinels in harzburgite and lherzolite inclusions From the San Giovannillarione quarry,Lessini Mountains, Veneto Region, ItalyMineralogy and Petrology, Vol. 40, No. 1, March pp. 73-88ItalyHarzburgite, Lherzolite
DS1989-1371
1989
Sengupta, S., Acharyya, S.K., Van Den Hul, H.J., Chattopadhyay, B.Geochemistry of volcanic rocks from the Naga Hillsophiolites,northeast India and their inferred tectonic settingJournal of the Geological Society of London, Vol. 146, No. 3, May pp. 491-498IndiaHarzburgite, Tectonics
DS1991-0213
1991
Canil, D.Experimental evidence for the exsolution of cratonic peridotite from high temperature harzburgiteEarth and Planetary Science Letters, Vol. 106, No. 1-4, September pp. 64-72GlobalPeridotite, Harzburgite
DS1991-0214
1991
Canil, D.Experimental evidence for the exsolution of cratonic peridotite from high-temperature harzburgiteEarth and Planetary Science Letters, Vol. 106, No. 1-4, September pp. 64-72MantleCraton, Experimental petrology, Harzburgite
DS1991-0926
1991
Kramers, J.D.Paradoxes of the mantle lithosphere underneath Archean continents and models for its originSchweiz. Mineral. Petrogr. Mitt, Vol. 71, pp. 175-186GlobalCraton, Harzburgite
DS1991-1523
1991
Schulze, D.J.Low -Ca garnet harzburgite xenoliths from southern Africa: abundance, composition, and bearing on the structure and evolution of the subcratoniclithosphereProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 350-352South AfricaXenoliths, Kimberley, Harzburgite
DS1991-1609
1991
Smith, C.B., Lucas, H., Hall, A.E., Ramsey, R.R.Diamond prospectivity from indicator mineralogy: a western AustralianperspectiveProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 380-382AustraliaHeavy mineral sampling, Hadfields, Pteropus, Argyle, Ellendale, peridotite, harzburgite, lherzolite, Skerring
DS1992-0460
1992
Field, S.W., Haggerty, S.E., Field, J.E., Green, J.M.Symplectities in peridotites and the growth of garnet in the upper mantleEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.336South Africa, MantlePeridotite, Harzburgite
DS1992-0833
1992
Kelemen, P.B., Dick, H.J.B., Quick, J.E.Formation of harzburgite by pervasive melt/rock reaction in the uppermantleNature, Vol. 358, August 20, pp. 635-640MantleMantle peridotite, Harzburgite
DS1992-0967
1992
Lutkov, V.S., Rossovskiy, L.N.Mantle inclusions in alkalic basalts of the Ethiopian RiftDoklady Academy of Sciences USSR, Earth Science Section, Vol. 315, pp. 199-204.RussiaMantle, Harzburgite
DS1992-1071
1992
Ming Zhang, Flower, M.F.J., Shimizu, N.Diversification of continental lithospheric mantle: trace element differentiation in mantle diopsidesEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 324MantleMantle diopsides, Xenoliths, lherzolite, harzburgite
DS1992-1211
1992
Plaksenko, A.N., Girnis, A.V., Isaichkin, A.A., Frolov, S.M.A harzburgite xenolith from the Voronezh crystalline massif PrecambriannoritesGeochemistry International, Vol. 29, No. 2, pp. 146-RussiaXenolith, Harzburgite
DS1993-0941
1993
Luth, R.W.Stability of carbon-bearing phases in the earth's mantleEos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 321.MantleLherzolite, Harzburgite, Eclogite
DS1993-1270
1993
Pustovetsov, A.A., Mitina, Ye.A., Ukhanov, A.V., Nikolskaya, N.Ye.In homogeneity in accessory chrome spinel as a geothermometerGeochemistry International, Vol. 30, No. 5, pp. 31-41.Russia, Urals, RussiaHarzburgite, Kemirsay intrusion
DS1994-1993
1994
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
DS1995-0520
1995
Farley, K.A.Rapid cycling of subducted sediments into the Samoan mantle plumeGeology, Vol. 23, No. 6, June pp. 531-534.GlobalHarzburgite xenoliths, Carbonatite, Metasomatism
DS1995-1088
1995
Lesnov, F.P., Lomonosova, E.I., et al.Partitioning of rare earth elements in olivines from ultramafic ophioliteassociations.Russian Geology and Geophysics, Vol. 36, No. 2, pp. 42-51.RussiaHarzburgite, lherzolite, wehrlite, Massif -Shaman, Naran, Dovyren
DS1996-0562
1996
Green, D.H.Experimental constraints on kimberlite genesisAustralia Nat. University of Diamond Workshop July 29, 30., 10p.MantleMelting, phase relationships, Redox, lherzolite, harzburgite
DS1997-0260
1997
De Waal, S.A., Gauert, C.D.K.The Basal Gabbro Unit and the identity of the parental magma of the Uitkomst Complex, Badplaas, South Africa.South African Journal of Geology, Vol. 100, 4, Dec. pp. 349-361.South AfricaLayered intrusion, Harzburgite
DS1998-0541
1998
Grutter, H.S.Chrome - calcium, magnesium number and Yttrium characteristics of garnets in depleted lherzolite...7th International Kimberlite Conference Abstract, pp. 277-9.South Africa, Colorado, ChinaLherzolite, harzburgite, dunite, Mantle xenoliths
DS1998-0751
1998
Kinzler, R.J., Grove, T.L.Origin of depleted cratonic harzburgite by deep fract. melt extraction and shallow olivine cumulate infusion.7th International Kimberlite Conference Abstract, pp. 426-428.GlobalCraton - mantle melt, Harzburgite
DS1998-0910
1998
Maaloe, S.Extraction of primary abyssal tholeiite from a stratified plumeJournal of Geology, Vol. 106, No. 2, March pp. 163-179.MantleHarzburgite, Melt layers, plumes
DS1998-0962
1998
Matsumoto, I., et al.Chemical composition of chromian spinel as a guide to genesis - prospect of chromitite in harzburgite mantleGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A120. abstract.JapanHarzburgite
DS1998-1509
1998
Van Achterbergh, E., Griffin, W.L., Steifenhofer, J.Xenoliths from the Letlhakane kimberlite: geochemistry and implications for mantle processes.7th International Kimberlite Conference Abstract, pp. 937-9.BotswanaHarzburgite, lherzolite, Metasomatism, Deposit - Latlhakane
DS2002-1018
2002
Maxeiner, R.O., et al.Paleoproterozoic backarc, arc and ophiolitic rocks on the northwest margin of the Trans Hudson Orogen:Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.74., p.74.SaskatchewanGeochemistry - ultramafics, harzburgite, websterite, Dykes
DS2002-1019
2002
Maxeiner, R.O., et al.Paleoproterozoic backarc, arc and ophiolitic rocks on the northwest margin of the Trans Hudson Orogen:Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.74., p.74.SaskatchewanGeochemistry - ultramafics, harzburgite, websterite, Dykes
DS200412-1298
2004
Menzies, A., Westerlund, K., Grutter, H., Gurney, J.J., Carlson, J., Fung, A., Nowicki, T.Peridotitic mantle xenoliths from kimberlites on the Ekati diamond mine property, NWT: major element compositions and implicatioLithos, Vol. 77, 1-4, Sept. pp. 395-412.Canada, Northwest TerritoriesSlave Craton, harzburgite, geothermometry, diamond grap
DS200412-1349
2004
Moine, B.N., Gregoire, M., O'Reilly, S.Y., Delpech, G., Sheppard, S.M.F., Lorand, J.P., Renac, Giret, CottinCarbonatite melt in oceanic upper mantle beneath the Kerguelen Archipelago.Lithos, Vol. 75, pp. 239-252.Kerguelen IslandsCarbonatite, harzburgite, metasomatism
DS200412-1542
2004
Phillips, D., Harris, J.W., Viljoen, K.S.Mineral chemistry and thermobarometry of inclusions from De Beers Pool diamonds, Kimberley, South Africa.Lithos, Vol. 77, 1-4, Sept. pp. 155-179.Africa, South AfricaDiamond Inclusions, silicate, oxide, harzburgitic
DS200512-0916
2004
Roy, A., Sarkar, A., Jeyakumar, S., Aggrawal, S.K., Ebihara, M., Satoh, H.Late Archean mantle metasomatism below eastern Indian craton: evidence from trace elements, REE geochemistry and Sr Nd O isotope systematics of ultramafic dykes.Proceedings National Academy of Sciences India , Vol. 113, 4, pp. 649-665.India, AsiaPeridotite, harzburgite, geochronology
DS200612-0617
2006
Ichiki, M., Baba, K., Obayashi, M., Utada, H.Water content and geotherm in the upper mantle above the stagnant slab: interpreation of electrical conductivity and seismic P wave velocity models.Physics of the Earth and Planetary Interiors, Vol. 155, 1-2, April 14, pp. 1-15.MantleGeothermometry, harzburgite, back arc volcanism
DS200712-0779
2007
Neumann, E.R., Simon, N.S.C., Bonadiman, C., Coltorti, Delpech, GregorieExtremely refractory oceanic lithospheric mantle and its implications for geochemical mass balance.Plates, Plumes, and Paradigms, 1p. abstract p. A712.MantleHarzburgite
DS200712-0864
2007
Python, M., Ishida, Y., Ceuleneer, G., Arai, S.Trace element heterogeneity in hydrothermal diopside: evidence for Ti depletion and Sr Eu LREE enrichment during hydrothermal metamorphism of mantle harzburgite.Journal of Mineralogical and Petrological Sciences, Vol. 102, 2, pp. 143-149.MantleHarzburgite
DS201112-0080
2011
Benard, A., Ionov, D.A., Shimizu, N., Plechov, P.Y.The volatile content of subduction zone melts and fluids.Goldschmidt Conference 2011, abstract p.513.Russia, KamchatkaHarzburgite xenoliths
DS201312-0326
2013
Gornova, M.A., Belyaev, V.A., Belozerova, O.Yu.Textures and geochemistry of the Saramta peridotites ( Siberian craton): melting and refertilization during early evolution of the continental lithospheric mantle.Journal of Asian Earth Sciences, Vol. 62, pp. 4-17.RussiaHarzburgite
DS201502-0041
2014
Batanova, V.G., Lyaskovskaya, Z.E., Savelieva, G.N., Sobolev, A.V.Peridotites from the Kamchatsky Mys: evidence of oceanic mantle melting near a hotspot.Russian Geology and Geophysics, Vol. 55, pp. 1395-1403.RussiaHarzburgite, plumes

Abstract: A suite of mantle peridotites sampled in the Kamchatsky Mys includes spinel lherzolite, clinopyroxene-bearing harzburgite, and harzburgite. Mineral chemistry of olivine, chromian spinel, and clinopyroxene show strongly correlated element patterns typical of peridotite formed by 8% to more than 22% partial melting. Clinopyroxene in the Kamchatka peridotites is compositionally different from that of both abyssal and suprasubduction varieties: Clinopyroxene in lherzolite is depleted in LREE relative to abyssal peridotite and that in harzburgite has very low LREE and Sr unlike the subduction-related counterpart. These composition features indicate that the rocks ultra-depleted in basaltic components originated in the vicinity of a hotspot, possibly, proto-Hawaiian plume, which provided high temperature and melting degree of the MORB source mantle at mid-ocean ridge.
DS201510-1792
2015
Nkoudandou, O.F., Bardintzeff, J-M., Fagny, A.M.Sub-continental lithospheric mantle structure beneath the Adamawa plateau inferred from the petrology of ultramafic xenoliths from Ngaoundere, Cameroon, Central Africa. Journal of African Earth Sciences, Vol. 111, pp. 26-40.Africa, CameroonLherzolite, Harzburgite, Olivine websterite

Abstract: Ultramafic xenoliths (lherzolite, harzburgite and olivine websterite) have been discovered in basanites close to Ngaoundéré in Adamawa plateau. Xenoliths exhibit protogranular texture (lherzolite and olivine websterite) or porphyroclastic texture (harzburgite). They are composed of olivine Fo89-90, orthopyroxene, clinopyroxene and spinel. According to geothermometers, lherzolites have been equilibrated at 880-1060 °C; equilibrium temperatures of harzburgite are rather higher (880-1160 °C), while those of olivine websterite are bracketed between 820 and 1010 °C. The corresponding pressures are 1.8-1.9 GPa, 0.8-1.0 GPa and 1.9-2.5 GPa, respectively, which suggests that xenoliths have been sampled respectively at depths of 59-63 km, 26-33 km and 63-83 km. Texture and chemical compositional variations of xenoliths with temperature, pressure and depth on regional scale may be ascribed to the complex history undergone by the sub-continental mantle beneath the Adamawa plateau during its evolution. This may involve a limited asthenosphere uprise, concomitantly with plastic deformation and partial melting due to adiabatic decompression processes. Chemical compositional heterogeneities are also proposed in the sub-continental lithospheric mantle under the Adamawa plateau, as previously suggested for the whole Cameroon Volcanic Line.
DS201603-0391
2016
Kopylova, M., Hill, P.J.A., Russell, J.K., Cookenboo, H.Lherzolitic versus harzburgitic garnet trends: sampling of extended depth versus extended composition: Reply to comments by Ivanic et al. 2015Contributions to Mineralogy and Petrology, Vol. 171, 2p.MantleHarzburgite

Abstract: Using the Hill et al. (Contrib Mineral Petrol 169:13, 2015. doi:10.1007/s00410-014-1102-7) modeling technique, we have tested the idea of Ivanic et al. (Contrib Mineral Petrol 164:505-520, 2012) that decompression and metamorphic re-equilibration of garnet with spinel causes garnet zoning perpendicular to the Cr-Ca harzburgitic trend in garnet composition. The modeling confirms that garnet zoning across the harzburgitic trend cannot form without spinel buffering. The harzburgitic trend is very rare because it results from extreme compositional heterogeneity of the mantle at the same depth. In contrast, the common lherzolitic trend requires less diversity in the bulk composition of the mantle, as it can be established with only a few samples of metamorphically re-equilibrated mantle peridotite deriving from a variety of depths.
DS201909-2051
2019
Jing, J-J., Su, B-X., Xiao, Y., Zhang, H-F., Uysal, I., Chen, C., Lin, W., Chu, Y., Saka, S.Reactive origin of mantle harzburgite: evidence from orthopyroxene-spinel association.Lithos, Vol. 342-343, pp. 175-186.Mantleharzburgite

Abstract: Harzburgites with high modal orthopyroxene (generally >23?vol%) in Archean craton, mantle wedge and oceanic lithospheric mantle are considered to be produced by the interaction between Si-rich liquids and rocks. However, the absence of samples from continental margin hinders the recognition whether this process is prevalent. Mantle xenoliths entrained in Miocene basalts from the Thrace Basin, the margin of Eurasian continent, are dominated by harzburgites with anomalously high orthopyroxene modes. These orthopyroxene grains closely associate with spinel and occasionally with clinopyroxene. In these orthopyroxene-spinel associations, orthopyroxene grains can be up to 1?cm in diameter and display high Al2O3 contents (1.41-4.61?wt%) and Mg# values (89.6-92.4), while spinel crystals are anhedral and bud-shaped and are commonly foliated, with a wide variation in Cr# values ranging from 7.8 to 52.7. The Fe2+/Fe3+ vs. TiO2 diagram shows lots of these spinels are “magmatic” (i.e. spinel crystallized from melts). The orthopyroxene grains have LREE diverging from the modelled melting trends, indicating possible metasomatism following partial melting. They are present in elongated shape, cutting across olivine grains and also replacing olivine as surrounding rims. Fine-grained olivine is occasionally enclosed in the orthopyroxene-spinel association. We, therefore, propose that the association of orthopyroxene and spinel developed from the melt/fluid-rock interaction. These features indicate mineral phase transformation from olivine to orthopyroxene, which can be expressed by the equation: ‘Mg2SiO4 (Ol)?+?SiO2?=?Mg2Si2O6 (Opx)’. The observed Al-rich rim of spinel and bud-shaped Al-spinel, suggest sufficient amount of Al in the Si-rich liquids. The mechanism involved here is the consumption of olivine to produce orthopyroxene and spinel as in the equation: ‘Mg2SiO4 (Ol)?+?Al2O3?=?MgSiO3 (Opx)?+?MgAl2O4 (Sp)’. The Si and Al were enriched in the percolating liquids. Both the high-Cr# and low-Cr# spinels with ‘magmatic’ features imply the percolating liquids were multi-staged or inhomogeneous Cr contents in the liquids. This melt/fluid-rock interaction may account for the formation of abundant harzburgites with high orthopyroxene modes in the Eurasian continental margin. Thus, it indicates the reacting harzburgites are prevalent in the lithospheric mantle beneath oceanic crust, Archean craton and mantle wedge, as well as in the continental margin.

 
 

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