KOKCHETAVITE: A NEW POTASSIUM-FELDSPAR POLYMORPH FROM THE KOKCHETAV ULTRAHIGH-PRESSURE TERRANE
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dc.contributor.author | Hwang S.-L. | |
dc.contributor.author | Shen P. | |
dc.contributor.author | Chu H.-T. | |
dc.contributor.author | Yui T.-F. | |
dc.contributor.author | Liou J.G. | |
dc.contributor.author | Zhang R.-Y. | |
dc.contributor.author | Sobolev N.V. | |
dc.contributor.author | Shatsky V.S. | |
dc.contributor.author | Zayachkovsky A.A. | |
dc.date.accessioned | 2022-03-24T08:31:06Z | |
dc.date.available | 2022-03-24T08:31:06Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13458497 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2004, 148, 3, 380-389 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36593 | |
dc.description.abstract | Kokchetavite, a new polymorph of K-feldspar (KAlSi3O8), has been identified as micrometer-size inclusions in clinopyroxene and garnet in a garnet-pyroxene rock from the Kokchetav ultrahigh-pressure terrane, Kazakhstan. Kokchetavite has a hexagonal structure with a =5.27(1), c=7.82(1), V=188.093, Z=1, and is found to be associated with phengite+/-cristobalite (or quartz)+siliceous glass phlogopite/titanite/calcite/zircon, occurring as multi-phase inclusions in clinopyroxene and garnet. It is concluded that kokchetavite could not be an exsolution phase in host minerals. Instead, it might be metastably precipitated from an infiltrated K-rich melt during rock exhumation. Alternatively, although less likely, kokchetavite might be derived from dehydration of K-cymrite, which, in turn, was formed at high pressures. In either case, kokchetavite is a metastable polymorph of K-feldspar. | |
dc.subject | Kokchetavite | |
dc.title | KOKCHETAVITE: A NEW POTASSIUM-FELDSPAR POLYMORPH FROM THE KOKCHETAV ULTRAHIGH-PRESSURE TERRANE | |
dc.type | Статья |
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