Paper No. 5
HWANG, Shyh-Lung, Department of Materials Science and Engineering, National Dong Hwa Univ, Department of Materials Science and Engineering, National Dong Hwa University, Hualien, Taiwan, ROC, Hualien, 974, Taiwan, SHEN, Pouyan, Institute of Materials Science and Engineering, National Sun Yat-sen Univ, Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC, Kaohsiung, 804, Taiwan, CHU, Hao-Tsu, Central Geological Survey, Central Geol Survey, Central Geological Survey, P.O. Box 968, Taipei, Taiwan, ROC, Taipei, YUI, Tzen-Fu, Institute of Earth Sciences, Academia Sinica, Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC, Taipei, Taiwan, LIOU, Juhn G., Geological & Environmental Sciences, Stanford Univ, Stanford, CA 94306, SOBOLEV, Nikolay V., Institute of Mineralogy and Petrography, Siberian Branch of Russian Academy of Sciences, Institute of Mineralogy and Petrography, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia, Novosibirsk, Russia, ZHANG, Ru Y., Department of Geological & Environmental Sciences, Stanford Univ, Stanford, CA 94305, SHATSKY, V.S., Institute of Mineralogy and Petrography, Siberian Branch of Russian Academy of Sciences, Institute of Mineralogy and Petrography, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia, Novosibirsk and ZAYACHKOVSKY, A.A., NEDRA Geol Expedition, NEDRA Geological Expedition, 475013 Kokchetav, Kazakhsta, Kokchetav, Kazakhstan, slhwang@mail.ndhu.edu.tw
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.
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