Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-24T00:50:59.378Z Has data issue: false hasContentIssue false
  • English
  • Français

Kosmochlor and chromian jadeite aggregates from the Myanmar jadeitite area

Published online by Cambridge University Press:  05 July 2018

G. H. Shi ,
B. Stöckhert  and
W. Y. Cui
G. H. Shi*
Affiliation:
China University of Geosciences, Beijing 100083, China Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
B. Stöckhert
Affiliation:
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
W. Y. Cui
Affiliation:
School of Earth and Space Sciences, Peking University, Beijing 100871, China
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Four distinct textures and related compositions of kosmochlor (Ko) and chromian jadeite in rocks from the Myanmar jadeitite area are described: (1) spheroidal or ellipsoidal aggregates with a corona texture surrounding relict chromite; (2) spheroidal or ellipsoidal aggregates with a core of jadeite; (3) granoblastic textures in undeformed coarse-grained clinopyroxene rocks; and (4) recrystallized fine-grained aggregates in deformed jadeitite. Nearly pure kosmochlor (97 mol.% NaCrSi2O6) was found in type 2 textures, closest to the end-member reported so far from a terrestrial rock. Sharp compositional boundaries between kosmochlor and chromian jadeite of variable composition are interpreted to be related to progressive crystallization or replacement at differing conditions. The compositions analysed plot along the kosmochlor-jadeite join. In contrast to conclusions of previous studies on the Myanmar clinopyroxenes there is no unequivocal evidence for miscibility gaps. The preservation of relict chromite in the centre of coronitic spheroidal or ellipsoidal aggregates of kosmochlor and jadeite indicates a metasomatic origin from a peridotite protolith at an inferred minimum pressure of 1.0 GPa and temperatures of 250—370°C. Recrystallization during later ductile deformation of the clinopyroxene rocks in the dislocation creep regime leads to fine-grained aggregates of chromian jadeite, which are of particular gemmological interest.

Keywords

kosmochlorjadeiteomphacitechromitecorona texturemetasomatismMyanmarjadeitite
Type
Research Article
Information
Mineralogical Magazine , Volume 69 , Issue 6 , December 2005 , pp. 1059 - 1075
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Abs-Wurmbach, I. and Neuhaus, A. (1976) Das system NaAlSi2O6 (Jd)-NaCrSi2O6 (Ko) im Druckbereich von 1 bar bis 25 Kbar bei 800°C. Neues Jahrbuchfür Mineralogie Abhandlungen, 127, 213–241.Google Scholar
Baryshnikova, G.V., Stakheeva, S.A., Lavrentjeva, Z.A., Ignatenko, K.I. and Lavrukhina, A.K. (1987) Chondrules in the Kainsaz CO chondrite: mineral composition and assemblages: comparison with the Allende CV and ordinary chondrite chondrules. Abstracts of the Lunar and Planetary Science Conference, XVIII, 46–47.Google Scholar
Bender, F. (1983) Geology of Burma. Gebrüder Bornträger, Berlin, 260 pp.Google Scholar
Boettcher, A.L. and Wyllie, P.J. (1969) Phase relationships in the system NaAlSiO4-SiO2-H2O to 35 kilobars pressure. American Journal of Science, 267, 875–909.CrossRefGoogle Scholar
Chhibber, H.L. (1934) The Mineral Resources of Burma. McMillan, London.Google Scholar
Coleman, R.G. (1961) Jadeite deposit of the Clear Creek area, New Idria district, San Benito County, California. Journal of Petrology, 2, 209–247.CrossRefGoogle Scholar
Coleman, R.G. (1980) Tectonic inclusions in serpentinite. Archives des Sciences, 33, 89–102.Google Scholar
Colombo, F., Rinaudo, C. and Trosarelli, C. (2000) The mineralogical composition of maw-sit-sit from Myanmar. Journal of Gemmology, 27, 87—92.CrossRefGoogle Scholar
Couper, A.G., Hey, M.H. and Hutchison, R. (1981) Cosmochlore: a new examination. Mineralogical Magazine, 44, 265–267.CrossRefGoogle Scholar
Essene, E.J. and Fyfe, W.S. (1967) Omphacite in Californian metamorphic rocks. Contributions to Mineralogy and Petrology, 15, 1—23.CrossRefGoogle Scholar
Frondel, C. and Klein, C.J.R. (1965) Ureyite (NaCrSi2O6): a new meteoritic clinopyroxene. Science, 149, 742–744.CrossRefGoogle Scholar
Goffe, B., Rangin, C. and Maluski, H, (2000) Jade and associated rocks from Jade Mines area, northern Myanmar as record of a poly-phase high-pressure metamorphism. Eos (Transactions of the American Geophysical Union), 81, F1365.Google Scholar
Gresens, R.L. (1967) Composition-volume relationships of metasomatism. Chemical Geology, 2, 47—65.CrossRefGoogle Scholar
Greshake, A. and Bischoff, A. (1996) Chromium-bearing phases in Orgueil (CI); discovery of magnesiochromite (MgCr2O4), ureyite (NaCrSi2O6) and chromium-oxide (Cr2O3). Abstracts of the Lunar and Planetary Science Conference, XXVIII, 461–462.Google Scholar
Harder, H. (1995) Trace elements as coloring agents in jadeites. Journal of Gemmology, 24, 508–511.CrossRefGoogle Scholar
Harlow, G.E. (1986) Jadeitites and their fluid inclusions from Rio Motagua, Guatemala. IMA86 abstracts with Program, International Mineralogical Association 14th General Meeting, Stanford University P. 119 (abstract).Google Scholar
Harlow, G.E. (1994) Jadeitites, albitites and related rocks from the Motagua Fault zone, Guatemala. Journal of Metamorphic Geology, 12, 49—68.CrossRefGoogle Scholar
Harlow, G.E. (1997) K in clinopyroxene at high pressure: an experimental study. American Mineralogist, 82, 259–269.CrossRefGoogle Scholar
Harlow, G.E. and Olds, E.P. (1987) Observations on terrestrial ureyite and ureyitic clinopyroxene. American Mineralogist, 72, 126—136.Google Scholar
Harlow, G.E. and Sorensen, S.S. (2001) Jade: occurrence and metasomatic origin. Australia Gemmology, 21, 7–10.Google Scholar
Harlow, G.E. and Sorensen, S.S. (2005) Jade (nephrite and jadeitite) and serpentinite: metasomatic connections. International Geology Review, 47, 113—146.CrossRefGoogle Scholar
Holland, T.J.B. (1980) The reaction albite = jadeite + quartz determined experimentally in the range 600-1200°C. American Mineralogist, 65, 129–134.Google Scholar
Holland, T.J.B. (1983) The experimental determination in disordered and short-range ordered jadeitic clinopyroxenes. Contributions to Mineralogy and Petrology, 82, 214–220.CrossRefGoogle Scholar
Htein, W. and Naing, A.M. (1994) Mineral and chemical composition of jade of Myanmar. Journal of Gemmology, 24, 269–276.CrossRefGoogle Scholar
Htein, W. and Naing, A.M. (1995) Studies on ureyite, jadeite and associated minerals in jade of Myanmar. Journal of Gemmology, 25, 315–320.CrossRefGoogle Scholar
Ikeda, K. and Yagi, K. (1972) Synthesis of kosmochlor and phase equilibria in join CaMgSi2O6- NaCrSi2O6 . Contributions to Mineralogy and Petrology, 36, 63–72.CrossRefGoogle Scholar
Johnson, C.A. and Harlow, G.E. (1999) Guatemala jadeitites and albitites were formed by deuterium-rich serpentinizing fluids deep within a subduction channel. Geology, 27, 629–632.2.3.CO;2>CrossRefGoogle Scholar
Kretz, R. (1983) Symbols for rock-forming minerals. American Mineralogist,, 68, 277–279.Google Scholar
Laspeyres, H. (1897) Mitteilungen aus dem mineralogischen Museum der Universität Bonn. Zeitschrift für Kristallographie und Mineralogie, 11, 586—600.Google Scholar
Liu, X.C., Zhou, H.Y., Ma, Z.S. and Chang, L.H. (1998) Chrome-rich clinopyroxene in orthopyroxenite from Maowu, Dabie mountains, central China: a second record and its implications for petrogenesis. The Island Arc, 7, 135–141.CrossRefGoogle Scholar
Manning, C.E. (1998) Fluid composition at the blue-schist—eclogite transition in the model system Na2O-MgO-Al2O3-SiO2-H2O-HCl. Schweizerische Mineralogische und Petrographische Mitteilungen, 78, 225–242.Google Scholar
Matsukage, K. and Arai, S. (1998) Jadeite, albite and nepheline as inclusions in spinel of chromitite from Hess Deep, equatorial Pacific: their genesis and implications for serpentinite diapir formation. Contributions to Mineralogy and Petrology, 131, 111–122.CrossRefGoogle Scholar
Mével, C. and Kiénast, J.R. (1980) Chromian jadeite, phengite, pumpellyite and lawsonite in high-pressure metamorphosed gabbro from the French Alps. Mineralogical Magazine, 43, 979—984.CrossRefGoogle Scholar
Mével, C. and Kiénast, J.R. (1986) Jadeite-kosmochlor solid solution and chromite, sodic amphiboles in jadeitites and associated rocks from Tawmaw (Burma). Bulletin de Minéralogie, 109, 617–633.CrossRefGoogle Scholar
Morimoto, N., Fabries, J., Ferguson, A.K., Ginzburg, I.V., Ross, M., Seifert, F.A., Zussman, J., Aoki, K. and Gottardi, D. (1988) Nomenclature of clinopyroxenes. American Mineralogist, 73, 1123–1133.Google Scholar
Ni, J.F., Guzman-Speziale, M., Bevis, M., Holt, W.E., Wallace, T.C. and Seager, W.R. (1989) Accretionary tectonics of Burma and the three-dimensional geometry of the Burma subduction zone. Geology, 17, 68–71.2.3.CO;2>CrossRefGoogle Scholar
Orzol, J., Trepmann, C., Stöckhert, B. and Shi, G.H. (2003) Critical shear stress for mechanical twinning of jadeite: an experimental study. Tectonophysics, 372, 135–145.CrossRefGoogle Scholar
Piepenbrier, D. and Stockhert, B. (2001) Plastic flow of omphacite in eclogites at temperature below 500°C: implications for interplate coupling in subduction zone. International Journal of Earth Sciences, 90, 197–210.CrossRefGoogle Scholar
Reznitskii, L.Z., Sklyarov, E.V. and Karmanov, N.S. (1999) The first occurrence of kosmochlor (ureyite) in metasediments. Doklady Akademii Nauk, 364, 523–526.Google Scholar
Sakamoto, S. and Takasu, A. (1996) Kosmochlor from the Osayama ultramafic body in the Sangun metamorphic belt, southwest Japan. Journal of Geological Society of Japan, 102, 49–52.CrossRefGoogle Scholar
Shi, G.H. and Cui, W.Y. (2004) Textures and microstructures of Myanmar jadeitite: implications for formation of jadeitic Fei-ts'ui. Journal of Gems and Gemmology (in Chinese with English abstract), 6(3), 8–11.Google Scholar
Shi, G.H., Cui, W.Y., Wang, C.Q. and Zhang, W.H. (2000) The fluid inclusions in jadeitites from Pharkant area, Myanmar. Chinese Science Bulletin, 45, 1896–1900.CrossRefGoogle Scholar
Shi, G.H., Cui, W.Y., Liu, J. and Yu, H.X. (2001) The petrology of jadeite-bearing serpentinized peridotite and its country rocks from Northwestern Myanmar (Burma). Acta Petrologica Sinica, 17, 483–490.Google Scholar
Shi, G.H., Cui, W.Y., Tropper, P., Wang, C.Q., Shu, G.M. and Yu, H.X. (2003) The petrology of a complex sodic and sodic-calcic amphibole association and its implications for the metasomatic processes in the jadeitite area in northwestern Myanmar, formerly Burma. Contributions to Mineralogy and Petrology, 153, 355—376.CrossRefGoogle Scholar
Shi, G.H., Tropper, P., Cui, W.Y., Tan, J. and Wang, C.Q. (2005) Methane (CH4)-bearing fluid inclusions in the Myanmar jadeitite. Geochemical Journal, 39, 503–516.CrossRefGoogle Scholar
Sobolev, V.N., Taylor, L.A., Snyder, G.A., Sobolev, N.V., Pokhilenko, N.P. and Kharkiv, A.D. (1997) A unique metasomatized peridotite xenolith from the Mir kimberlite pipe (Yakutia). Geologiya I Geofizika, 38, 206–215.Google Scholar
Sobolev, V.S., Sobolev, N.V. and Lavarnt'eva, Uy.G. (1975) Chrome-rich clinopyroxenes from the kimberlities of Yakutia. Neues Jahrbuch für Mineralogie Abhandlungen, 123, 213–218.Google Scholar
Stunitz, H. (1998) Syndeformational recrystallization: dynamic or compositionally induced. Contributions to Mineralogy and Petrology, 131, 219—236.Google Scholar
Trepmann, C. and Stockhert, B. (2001) Mechanical twinning of jadeite: an indication of synseismic loading beneath the brittle-plastic transition. International Journal of Earth Sciences, 90, 4—14.CrossRefGoogle Scholar
Tropper, P., Essene, E.J., Sharp, Z.D. and Hunziker, J.C. (1999) Application of K-feldspar-jadeite-quartz barometry to eclogite facies metagranites and metapelites in the Sesia Lanzo Zone (Western Alps, Italy). Journal of Metamorphic Geology, 17, 195–209.CrossRefGoogle Scholar
Tsujimori, T. and Liou, J.G. (2004) Coexisting chromian omphacite and diopside in tremolite schist from the Chugoku Mountains, SW Japan: the effect of Cr on the omphacite-diopside immiscibility gap. American Mineralogist, 89, 7—14.CrossRefGoogle Scholar
Vredevoogd, J.J. and Forbes, W.C. (1975) System diopside-ureyite at 20 kbar. Contributions to Mineralogy and Petrology, 52, 147—156.CrossRefGoogle Scholar
Yang, C.M.O. (1984) A terrestrial source of ureyite. American Mineralogist, 69, 1180–1183.Google Scholar
Yang, C.M.O. (2001) Hte-long-sein: a new variety of chrome jadeite jade. Journal of Gemmology, 27, 321–327.CrossRefGoogle Scholar
Zinovieva, N.G., Mitreikina, O.B. and Granovsky, L.B. (1999) Origin of jadeite-ureyite-bearing clino-pyroxene in ordinary chondrites: evidence for significant pressures in the parental bodies. Abstracts of the Lunar and Planetary Science Conference, XXXI, 10.Google Scholar