T262 Phase Relations, High P-T Terrains, P-T-ometry and Plate Pushing (Posters): A Tribute to W.G. Ernst
DISCOVERY OF ANHYDROUS K-CYMRITE IN THE KOKCHETAV UHP TERRAIN
Paper number: T262-5
Program: Technical Sessions
Time: 1:30 PM – 5:30 PM
Authors
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Pouyan ShenNational Sun Yat-sen Univ, Kaohsiung, N/A
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Hao-Tsu ChuCentral Geol Survey, Taipei, N/A
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Tzen-Fu YuiAcademia Sinica, Taipei, N/A
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Juhn G. LiouStanford Univ, Stanford, CA
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Nikolay V. SobolevSiberian Branch of Russian Academy of Sciences, Novosibirsk, N/A
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Ru Y. ZhangStanford Univ, Stanford, CA
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V.S. ShatskySiberian Branch of Russian Academy of Sciences, Novosibirsk, N/A
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A.A. ZayachkovskyNEDRA Geol Expedition, Kokchetav, N/A
Abstract
Having H2O molecules in the cage of double Al,Si tetrahedral sheets, K-cymrite (KAlSi3O8.H2O) could be the reservoir of H2O for subducted quartzofeldsparthic crust, though yet to be found on the earth. This paper reports the discovery of micrometer-size anhydrous K-cymrite in clinopyroxene and garnet of a garnet-pyroxene rock and in clinopyroxene of a dolomitic marble from Kumdy-Kol in the Kokchetav Massif, Kazakhstan. Anhydrous K-cymrite always occurs as composite inclusions consisting of K-cymrite °Ó siliceous glass °Ó cristobalite / quartz °Ó phengite. K-cymrite could have been formed from a hydrous K-aluminosilicate partial melt along the prograde path, served as a temporal water carrier and later underwent dehydration in dry conditions.