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SDLRC - Region: Japan - All


The Sheahan Diamond Literature Reference Compilation - Technical, Media and Corporate Articles based on Major Region - Japan
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 Region 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 addition most references have been tagged with one or more region words. In an effort to make it easier for users to track down articles related to a specific region, KRO has extracted these region words and developed a list of major region words presented in the Major Region Index to which individual region words used in the article reference have been assigned. Each individual Region Report contains in chronological order all the references with a region word associated with the Major Region word. Depending on the total for each reference type - technical, media and corporate - the references will be either in their own technical, media or corporate Region Report, or combined in a single report. Where there is a significant number of technical references there will be a technical report dedicated to the technical articles while the media and corporate references are combined in a separate region report. References that were added in the most recent monthly update are highlighted in yellow within the Region Report. The Major Region words have been defined by a scale system of "general", "continent", "country", "state or province" and "regional". Major Region words at the smaller scales have been created only when there are enough references to make isolating them worthwhile. References not tagged with a Region are excluded, and articles with a region word not matched with a Major Region show up in the "Unknown" report.
Kimberlite - diamondiferous Lamproite - diamondiferous Lamprophyre - diamondiferous Other - diamondiferous
Kimberlite - non diamondiferous Lamproite - non diamondiferous Lamprophyre - non diamondiferous Other - non diamondiferous
Kimberlite - unknown Lamproite - unknown Lamprophyre - unknown Other - unknown
Future Mine Current Mine Former Mine Click on icon for details about each occurrence. Works best with Google Chrome.
CITATION: Faure, S, 2010, World Kimberlites CONSOREM Database (Version 3), Consortium de Recherche en Exploration Minérale CONSOREM, Université du Québec à Montréal, Numerical Database on consorem.ca. NOTE: This publicly available database results of a compilation of other public databases, scientific and governmental publications and maps, and various data from exploration companies reports or Web sites, If you notice errors, have additional kimberlite localizations that should be included in this database, or have any comments and suggestions, please contact the author specifying the ID of the kimberlite: [email protected]
Japan - Technical, Media and Corporate
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1984-0114
1984
Arai, S.Igneous Mineral equilibration temperatures in Some Alpine Type Peridotites in JapanTerra Sci. Publishing Materials science of the earth's interior, pp. 445-460JapanPeridotite, Petrology
DS1984-0118
1984
Ashburn, A., Jablonwo, J.Japan Pushes into Diamond TurningAmerican Machinery, Vol. 128, No. 12, DECEMBER PP. 75-79.JapanIndustrial
DS1984-0436
1984
Kubo, K., Satoh, H.Petrology of Lamphrophyre in the Urakawa Area, Hokkaido, Japan.Journal of Geological Society JAPAN., Vol. 90, No. 10, PP. 717-731.JapanPetrography, Chemical Analyses, Monchoquite, Miocene Age
DM1985-0845
1985
Industrial MineralsJapan: Synthetic Diamond BreakthroughIndustrial Minerals, No. 213, JUNE, P. 10.JapanSynthetic
DS1986-0451
1986
Koivula, J.I.Gems news:India -Tanna and Chatapur areas. Japan -largestsyntheticdiamond. South Africa - Diamond inclusions in pyrope.Sri Lanka - geological exploration dGems and Gemology, Vol. 22, No. 1, Spring pp. 54-55India, Japan, South Africa, Sri LankaNews items, Diamond morphology
DS1986-0591
1986
Nago, T., Matsumoto, Y., et al.Cenozoic minette from Kawamoto district, Shimane prefecture SouthwestJapan.*JAPGanseki Kobutsu Kosho Gakki-Shi, *JAP, Vol. 81, No. 10, pp. 423-426JapanPetrology, Minette
DS1986-0700
1986
Sakikawa, N.Science of diamond.*JAPKyoritsu Shuppan Co, Tokyo, *JAP, JapanBlank
DM1987-0840
1987
Beverley, J.Japan make synthetic diamondsDiamond News and South African Jeweller, Vol. 50, No. 8, May p. 37JapanSynthetic diamond, Brief Note
DS1987-0324
1987
Kagami, H., Koide, Y.Evolution of the earth's mantle: as deduced from neodymium isotopes.*JAPChikyu Kagaku, *JAP, Vol.41, No. 1, (208) pp. 1-22JapanKimberlite
DS1987-0325
1987
Kagami, H., Koide, Y.Evolution of the earth's mantle- considering neodymium isotope.*JPNChikyu Kagaku, *JPN., Vol. 41, No. 1, pp. 1-22JapanBlank
DS1987-0542
1987
Obata, M., Nagahara, N.Layering of alpine type peridotite and the segregation of partial melt In the upper mantleJournal of Geophysical Research, Vol. 92, No. b5 April 10, pp. 3467-3474JapanMantle genesis, Metasomatism
DS1987-0650
1987
Sato, J.Today and future for industrial applications of diamond. *JAPTetsu Hagan, *JAP, Vol. 73, No. 11, September pp. 1471-1478JapanIndustrial
DS1988-0719
1988
Umeda, I.Fading of coloured diamond by thermal neutron irradiationPatent: JPN Kokai Tokkyo Koho 88162600 A2 July 1988, 3pJapanPatent, Diamond irradiation
DS1988-0721
1988
Uto, K., Hirai, H., Goto, K., Arai, S.K-Ar ages of carbonate and mantle nodule bearing lamprophyre dikes fromShingu, central Shikoku, southwest JapanGeochemical JOurnal, Vol. 21, No. 6, pp. 283-290JapanBlank
DS1989-0254
1989
Chen Chia Fu, Huang, Yen C., Hosomi, S.Growth of diamond seed crystals by microwave plasma CVD.*JAPHyomen, Gitjutsu, *JAP, Vol. 40, No. 2, pp. 295-300JapanDiamond synthesis
DS1989-0715
1989
Johnson, E., Wood, B.J.Oxidation states and rare earth elements (REE) contents of spinel lherzolite xenoliths:implications for metasomatic processes in the upper mantleEos, Vol. 70, No. 15, April 11, p. 510. (Abstract)United States, Japan, Australia, FranceXenoliths, Lherzolite
DS1989-0717
1989
Johnson, K.E., Wood, B.J.Closed system oxygen isotope behaviour in spinel lherzolite xenoliths:possible relations to oxidationstateEos, Vol. 70, No. 43, October 24, p. 1411. (Abstract)United States, Australia, Japan, Germany, FranceGeochronology, Xenoliths
DS1989-1087
1989
Nago, T., Fujibayashi, N.Highly potassic lamprophyre from the Sera Plateau In the ChugokuMountains, southwest Japan.*JPN.Ganko, *JPN., Vol. 84, No. 8, pp. 70-277JapanMinette, Potassic lamprophyre
DS1989-1160
1989
Ozawa, K.Stress induced Al-chromium zoning in spinel in deformed peridotitesNature, Vol. 338, No. 6211, March 9, pp. 141-144Japan, OmanOphiolite Miyamori, Horoman ultramfic, Oman ophiolite, Geochemistry
DS1990-0977
1990
Malpas, J., Moores, E.M., Pantayiotou, A., Xenophontos, C.Ophiolites- oceanic crustal analoguesCyprus Geological Survey, 733p. $ 65.00Japan, Indonesia, California, Oregon, Mid-Atlantic Ridge, ScotlandOphiolites, Book -ad
DS1991-0028
1991
Arai, S., Okada, H.Petrology of serpentine sandstone as a key to tectonic development of serpentine beltsTectonophysics, Vol. 195, pp. 65-81JapanPeridotite -general serpentine belts, Tectonics, Petrology
DS1991-0313
1991
Cosgrove, J., Jones, M.Neotectonics and resourcesBelhaven Press, 450p. Cost?Costa Rica, Taiwan, Egypt, Papua New Guinea, JapanNeotectonics, Book -table of contents
DM1991-2028
1991
Diamond News and South African JewellerSoviets look at Japan (markets)Diamond News and South African Jeweller, No. 11, November p. 53Russia, JapanNews item, De Beers
DS1991-1337
1991
Peters, T.J., Nicolas, A., Coleman, R.G.Ophiolite genesis and evolution of the oceanic lithosphere. Proceedings of conference held Oman Jan. 7-18, 1990Kluwer Publ, 900pOman, East Pacific Rise, Cyprus, Japan, Morocco, NewfoundlandOphiolites, genesis, mantle, magmatic, hydrothermal, tecton, Table of contents
DM1993-1886
1993
Diamond InternationalStill a yen for diamonds... buying in JapanDiamond International, No. 24, July/August pp. 69-70, 72JapanNews item, Sales of diamonds
DM1993-1895
1993
Diamond InternationalJapanese-Yakut venture .. just the startDiamond International, January-February p. 21Russia, Commonwealth of Independent States (CIS), JapanNews item, Polished stones
DM1993-1974
1993
Gem News InternationalSumitomo Electric synthesizes high-purity diamondsGems and Gemology, Gem News, Vol. 29, Fall, pp. 208.JapanDiamond morphology, Synthetic diamonds
DS1993-0739
1993
Japan Society of GeoinformaticsRecent advances in geomathematics and geoinformaticsJapan Society of Geoinformatics, 246p. approx. $ 30.00JapanBook -ad, Geomathematics
DS1993-1013
1993
McPhie, J., Doyle, M., Allen, R.Volcanic texturesCodes Key Centre, University Of Of Tasmania, $ 90.00United States, Japan, New Zealand, Central and South AmericaBook -ad, Volcanic textures
DS1993-1275
1993
Raghaven, V., Wadatsumi, K., Masumoto, S.Automatic extraction of lineament information from satellite images using digital eleveation dataNonrenewable Resources, Vol. 2, No. 2, Summer pp. 148-155JapanRemote sensing, Tectonics, structure
DS1994-0059
1994
Arai, S.Characterization of spinel peridotites by olivine-spinel compositionalrelationships: review and interpretation.Chemical Geology, Vol. 113, pp. 191-204.JapanPeridotites, Petrology
DS1994-1324
1994
Ozawa, K.Melting and melt segregation in mantle wedge above a subductionzone:evidence chromite bearing peridotites.Journal of Petrology, Vol. 35, No. 3, pp. 647-678.Japan, MantleSubduction zone, Miyamori ophiolite complex
DS1994-1748
1994
Taylor, R.N., Nesbitt, R.W., Vidal, F., Harmon, R.S., et al.Mineralogy, chemistry and genesis of the boninite series volcanics, Chichijima, Bonin Islands, Japan.Journal of Petrology, Vol. 35, No. 3, June pp. 577-618.JapanBoninites
DS1995-0054
1995
Arai, S., Abe, N.Reaction of orthopyroxene in peridotite xenoliths with alkali-basalt melt and its implication for alpine crAmerican Mineralogist, Vol. 80, No. 9-10, Sept, Oct pp. 1041-1047.JapanXenoliths
DS1995-0953
1995
Kimura, G., Ludden, J.Peeling oceanic crust in subduction zonesGeology, Vol. 23, No. 3, March pp. 217-220.JapanCrust, Subduction
DS1995-1045
1995
Lalleman, S.High rates of arc consumption by subduction processes: some consequencesGeology, Vol. 23, No. 6, June pp. 551-554Japan, PeruMantle, Subduction, arc consumption
DS1995-1046
1995
Lallemand, S.High rates of arc consumption by subduction processes: some consequencesGeology, Vol. 23, No. 6, June pp. 551-554.Japan, PeruSubduction
DS1995-1323
1995
Nakada, N., Takeda, Y.Roles of mantle diapir and ductile lower crust on island arc tectonicsTectonophysics, Vol. 246, No. 1-3, June 15, pp. 147-162JapanMantle diapirs, Tectonics -arc
DM1996-1780
1996
Diamond InternationalTaming Asia's tigers... region has the strongest long tern development potential in the world.Diamond International, Sept.- Oct p. 53-58.southeast Asia, Thailand, Japan, Korea, Taiwan, Hong KongNews item, Markets
DS1996-0534
1996
Glasby, G.P.The relation between ore deposit formations and subduction: mass balanceconsiderationsThe Island Arc, Vol. 5, No. 4, Dec. pp. 396-406JapanDeposit - Kuroko
DS1996-1386
1996
Sungawa, I.Morphology of diamonds as a basis for identification and finger printing Of gem diamonds.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 509.JapanDiamond morphology, Identification
DS1997-0539
1997
International Geological CongressEnergy and mineral resources for the 21st Century - geology of mineraldeposits, mineral economicsIgc 30th, Vol. 9, 550pChina, Korea, Finland, France, Japan, Colorado, ItalyBook - table of contents, Mineral deposits
DS1997-0780
1997
Mikesell, R.F.Explaining the resource curse, with special reference to mineral-exportingcountriesResources Policy, Vol. 23, No. 4, pp. 191-199Japan, ZambiaEconomics - exports, discoveries, success
DM1997-1788
1997
New York DiamondsWill there be enough to go around?Asians want better quality diamonds as do Americans.New York Diamonds, May-June p. 40-48.United States, Asia, JapanNews item, Markets
DS1997-1129
1997
Svorak, J.J., Dzurisin, D.Volcano geodesy: the search for magma reservoirs and the formation of eruptive ventsReviews of Geophysics, Vol. 35, No. 3, August pp. 343-384Hawaii, California, Italy, Papua New Guinea, JapanMagma, Vents
DM1998-2081
1998
London Mining JournalMineral exploration - annual review supplementLondon Mining Journal, Vol. 330, No. 8466, Feb. 6, pp. 1-8United States, Japan, Africa, Middle East, Asia, Pacific, EuropeExploration - brief review
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
DM1998-2483
1998
PaydirtRough diamond sales in Japan expected to risePaydirt, Vol. 1, No. 39, p. 69.JapanDiamond markets, CSO
DS1998-1482
1998
Treloar, P.J., O'Brien, P.What drives metamorphism and metamorphic reactons?Geological Society of London Spec. Pub, No. 138, 240p. $ 115.00Europe, Spain, Japan, PakistanBook - ad, Metamorphism, barrovian
DM2000-1630
2000
RapaportRapaport to enter Japanese diamond market with new internet pricing and trading services via Diamonds.coM.Rapaport Group, Aug. 30, 2p.JapanNews item - press release, Diamonds.net
DS2001-0038
2001
Aoya, M.P T D path of eclogite from the Samagawa belt deduced from combination of petrological and microstructural...Journal of Petrology, Vol. 42, No. 7, July, pp. 1225-48.JapanEclogite
DS2001-0739
2001
Matsumoto, I., Arai, S.Morphological and chemical variations of chromian spinel in dunite harzburgite complexes from Sangun ZoneMineralogy and Petrology, Vol. 73, No. 4, pp. 305-24.JapanMantle melt reaction, Chromitite formation - not specific to diamonds
DS2001-1275
2001
Yamamoto, J., Watanabe, M., Nozaki, SanoHelium and carbon isotopes in fluorites: implications for mantle carbon contribution ancient subduction zoneJournal of Volc. Geotherm. Res., Vol. 107, No. 1-3, pp. 19-26.JapanCarbon - not specific to diamonds
DM2002-1969
2002
FortuneJapan vs Botswana - Moody's credit rating ranks Botswana to A2 five rungs below the AAA rating of Botswana.Fortune, June 24, 1p.Botswana, JapanNews item, Economics
DS2002-1462
2002
Shimoyama, A., Yabuta, H.Mono and bicyclic alkanes and diamondoid hydrocarbons in the Cretaceous Tertiary boundary sediments HokkaidoGeochemical Journal, Vol.36,pp.173-89., Vol.36,pp.173-89.JapanGeochemistry - not on topic but interesting, Diamondoid hydrocarbons
DS2002-1463
2002
Shimoyama, A., Yabuta, H.Mono and bicyclic alkanes and diamondoid hydrocarbons in the Cretaceous Tertiary boundary sediments HokkaidoGeochemical Journal, Vol.36,pp.173-89., Vol.36,pp.173-89.JapanGeochemistry - not on topic but interesting, Diamondoid hydrocarbons
DM2003-2099
2003
RapaportWorld's hardest synthetic diamond... from graphite by JapaneseRapaport News, Feb. 9, 1/4p.JapanNews item
DM200512-1337
2005
Canadian DiamondsLost in translation... Companies need to find the right language to sell to the land of the rising sun.Canadian Diamonds, Summer, p. 24-28.JapanNews item - markets, branding
DM200512-1343
2005
Canadian PressAber Diamond to expand retail chain Harry Winston to 25 stores over 3-5 years.Canadian Press, June 9, 1p.United States, Japan, China, RussiaNews item - Aber Diamond
DM200512-1451
2005
Globe & MailJapan's no gem for Tiffany. Investors not treating high end jeweller like gold over slumping sales in the East.Globe & Mail, May 17, p. B14.JapanNews item - Tiffany
DM200512-2010
2005
Rapaport NewsAlrosa sells 11 stones at trial auction. First auction held in Tokyo.Rapaport, Feb. 4, 1/4p.JapanNews item - Alrosa
DS200612-1000
2006
Oh, C.W.A new concept on tectonic correlation between Korea, Chin a and Japan: histories from the late Proterozoic to Cretaceous.Gondwana Research, Vol. 9, pp. 47-61.Asia, China, Korea, JapanUHP, Dabie Sulu collision belt
DM200712-1644
2007
Diamonds.netAnglo's CEO: huge potential markets for diamonds in China, India, Japan.Diamonds.net, August 7, 1/4p.China, India, JapanNews item - Anglo
DS200812-0757
2008
Mizukami, T., Wallis, S., Enami, M., Kagi, H.Forearc diamond from Japan.Geology, Vol. 36, 3 March pp. 219-222.JapanLamprophyre, dykes
DS200912-0543
2009
Obayashi, M., Yoshimitsu, J., Fukao, Y.Tearing of stagnant slab.Science, Vol. 324, 5931, pp. 1173-1175.JapanSubduction
DS201012-0183
2009
Emmott, B.Eastern promise... financial,political and industrial developments have seen China, India and Japan's fortunes rise. Rivalry... constructive or destructive?Optima, December pp. 31-37.China, India, JapanEconomics
DM201112-2090
2011
Idex OnlineBelieve in Japan, it believes in itself.Idex Online, March 17, 1p.Global, JapanNews item - economics
DM201112-2118
2011
Idex OnlineJapan prefers high price diamond over volume, imports up 11%.Idex Online, July 7, 1/2p.JapanNews item - imports
DM201112-2159
2011
Idex OnlineJapan not losing its interest in diamonds.Idex Online, Oct. 6, 1/2p.Asia, JapanNews item - markets
DM201112-2161
2011
Idex OnlinePost tsunami, Japan's diamond imports keeps growing.Idex Online, May 30, 1p.JapanNews item - markets, economics
DM201309-2235
2013
Diamonds.netRio Tinto showcases the worlds rarest red, pnk and blue diamonds in Tokyo.Diamonds.net, July 30, 1/4p.JapanNews item - Argyle
DM201309-2314
2013
The Israeli Diamond IndustryJapan sees 1st Argyle pink, red diamonds in 5 years.israelidiamond.co.il, July 30, 1/4p.JapanNews item - Argyle
DM201501-0800
2014
Idex MemoLong path to recovery shows few signs of ending for Japan. Idexonline.com, Dec. 19, 2p.JapanNews item - economics
DS201602-0202
2015
Dobretsov, N.L.Periodicity and driving forces of volcanism.Russian Geology and Geophysics, Vol. 56, pp. 1663-1670.Global, JapanMantle plume

Abstract: The volume and style of volcanism change periodically, with cycles of three main scales, which have different causes and effects. Short cycles of volcanic activity last from tens to thousands of years and are associated with periodic accumulation of magma in shallow chambers and its subsequent eruptions. The eruptions either have internal causes or are triggered externally by variations in solar activity, tidal friction, and Earth’s rotation speed. Medium-scale cycles, hundreds of thousands to millions of years long, are due to changes in spreading and subduction rates. Long cycles (30–120 Ma) are related to ascent of mantle plumes, which take away material and heat from the core-mantle boundary and change the convection rate. These appear to be the major controls of the average periodicity. Acceleration of asthenospheric convection caused by periodic plume activity pulses can change spreading rates and, correspondingly, the relative positions of moving plates. The medium-scale periodicity of volcanism is illustrated by the examples of Kamchatka and Japan, where the intensity of subduction magmatism changes periodically in response to the opening of back-arc basins (Shikoku, Sea of Japan, and South Kurile basin).
DM201706-1207
2017
Rough-polishedSarine profile to debut in the Japanese market with K-Uno Group.roughdiamond.com, May 3, 1/4p.JapanNews item - Sarine
DM201707-1435
2017
Diamonds.netDe Beers inks Japan retail grading unit.Diamonds.net, June 12, 1/4p.JapanNews item - De Beers
DM201908-1887
2019
JCK NewsLab-grown diamond companies receive investment. Cornes stake in Green Rocks and Isrough.jcknews.com, July 16, 1/2p.Europe, Israel, Asia, JapanNews item - synthetics
DM201908-1943
2019
Rough-polishedScientists use diamonds to teleport quantum information.rough-polished.com, July 19, 1/4p.Asia, JapanNews item - IT
DS202008-1428
2020
Nishiyama, T., Ohfuji, H., Fukuba, K., Terauchi, M., Nishi, U., Harada, K., Unoki, K., Moribe, Y., Yoshiasa, A., Ishimaru, S., Mori, Y., Shigeno, M., Arai, S.Microdiamond in a low grade metapelite from a Cretaceous subduction complex, western Kyushu, Japan. ( UHP) Nishisonogi unitNature Scientific Reports, Vol. 10, 11645 11p. PdfAsia, Japanmicrodiamond

Abstract: Microdiamonds in metamorphic rocks are a signature of ultrahigh-pressure (UHP) metamorphism that occurs mostly at continental collision zones. Most UHP minerals, except coesite and microdiamond, have been partially or completely retrogressed during exhumation; therefore, the discovery of coesite and microdiamond is crucial to identify UHP metamorphism and to understand the tectonic history of metamorphic rocks. Microdiamonds typically occur as inclusions in minerals such as garnet. Here we report the discovery of microdiamond aggregates in the matrix of a metapelite from the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan. The Nishisonogi unit represents a Cretaceous subduction complex which has been considered as an epidote-blueschist subfacies metamorphic unit, and the metapelite is a member of a serpentinite mélange in the Nishisonogi unit. The temperature condition for the Nishisonogi unit is 450 °C, based on the Raman micro-spectroscopy of graphite. The coexistence of microdiamond and Mg-carbonates suggests the precipitation of microdiamond from C-O-H fluid under pressures higher than 2.8 GPa. This is the first report of metamorphic microdiamond from Japan, which reveals the hidden UHP history of the Nishisonogi unit. The tectonic evolution of Kyushu in the Japanese Archipelago should be reconsidered based on this finding.
DS202010-1864
2020
Nishiyama, T.Microdiamond in a low grade metapelite from a Cretaceous subduction complex, western Kyushu, Japan.Scientific Reports, doi:10.1038/ s41598-020-68599-7Asia, Japanmicrodiamonds

Abstract: Microdiamonds in metamorphic rocks are a signature of ultrahigh-pressure (UHP) metamorphism that occurs mostly at continental collision zones. Most UHP minerals, except coesite and microdiamond, have been partially or completely retrogressed during exhumation; therefore, the discovery of coesite and microdiamond is crucial to identify UHP metamorphism and to understand the tectonic history of metamorphic rocks. Microdiamonds typically occur as inclusions in minerals such as garnet. Here we report the discovery of microdiamond aggregates in the matrix of a metapelite from the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan. The Nishisonogi unit represents a Cretaceous subduction complex which has been considered as an epidote-blueschist subfacies metamorphic unit, and the metapelite is a member of a serpentinite mélange in the Nishisonogi unit. The temperature condition for the Nishisonogi unit is 450 °C, based on the Raman micro-spectroscopy of graphite. The coexistence of microdiamond and Mg-carbonates suggests the precipitation of microdiamond from C-O-H fluid under pressures higher than 2.8 GPa. This is the first report of metamorphic microdiamond from Japan, which reveals the hidden UHP history of the Nishisonogi unit. The tectonic evolution of Kyushu in the Japanese Archipelago should be reconsidered based on this finding.
DM202010-1974
2020
Rough-polishedRio Tinto's Argyle pink diamond tender takes inspiration from Japan.rough-diamond.com, Sept. 25, 1/4p.Australia, JapanNews item - Argyle
 
 

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