POTASSIUM-RICH ROCKS: PHASE ANALYSIS AND HETEROMORPHIC RELATIONS
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dc.contributor.author | Yoder H.S. | |
dc.date.accessioned | 2020-02-17T08:21:54Z | |
dc.date.available | 2020-02-17T08:21:54Z | |
dc.date.issued | 1986 | |
dc.identifier | https://elibrary.ru/item.asp?id=10501055 | |
dc.identifier.citation | JOURNAL OF PETROLOGY, 1986, 27, 5, 1215 | |
dc.identifier.issn | 0022-3530 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/15871 | |
dc.description.abstract | A large number of potassium-rich igneous rocks can be displayed as a contiguous set of mineral assemblages in a modified normative tetrahedron kalsilite-forsterite-larnite-quartz. Pairs of phases in subtetrahedra undergo reaction relations that result in new subtetrahedra representative of observed igneous rock assemblages. Some of the heteromorphic relations recognized are: Jumillite-Shonkinite⇄Missourite-Absarokite Alnoite-Italite⇄Venanzite-Melilite Ugandite Leucite Katungite-Melilite Ugandite⇄Melilite Mafurite-Leucite Mafurite Alnoite-Vesecite⇄Monticellite Peridotite-Monticellite Melilitite Other subtetrahedra are generated by the breakdown of phlogopite, leucite, and monticellite. The relationships of the various magma types are outlined in a flow sheet for 1 atm, and some of the critical changes in thermal barriers are described for elevated pressures. The high-potassium content remains the principal problem; however, the shift of invariant points with pressure suggests generation by partial melting at high pressures. The complex mineralogy and diversity of the potassium-rich rocks are attributed mainly to incomplete reactions, with or without volatiles, between critical phases of limited range of stability. | |
dc.title | POTASSIUM-RICH ROCKS: PHASE ANALYSIS AND HETEROMORPHIC RELATIONS | |
dc.type | Статья |
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