Partial Melting of Plagioclase-Free Garnet-Two-Mica  Metapelite as a Model of the Formation of Ultra-K Felsic Magmas in the Continental Crust

Mityaev, A.S.; Safonov, O.G.; Varlamov, D.A.; Van Reenen, D.D.; Serdyuk, A.A.; Aranovich, L.Y.

Авторы: Mityaev A.S., Safonov O.G., Varlamov D.A., Van Reenen D.D., Serdyuk A.A., Aranovich L.Y.
Журнал: Doklady Earth Sciences
Том: 507
Номер: 2
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1064
Последняя страница: 1070
DOI: 10.1134/S1028334X22600724
Аннотация: Abstract—To study the formation of ultra-K granitic melts of the S type under the conditions of the conti- nental crust, we conducted experiments on partial melting of plagioclase-free garnet–two mica metapelite (with accessory apatite and ilmenite) at 6, 10, and 15 kbar and 700–900C. Melting of rock depends on a series of reactions of pressure-related peritectic melting and starts at temperatures of 750–800, ~800, and ~850C at 6, 10, and 15 kbar, respectively, reflecting the positive dP/dT slope of the solidus. These PT-con- ditions of melting and the compositions of mineral assemblages and granitic melts formed during melting of plagioclase-free metapelites are similar to those formed during melting of plagioclase-bearing two mica assemblages. The high K2O content (7–8 wt %) at a K2O/Na2O ratio of >8–10 is the main feature of the com- position of the melt, which forms upon melting of plagioclase-free metapelite. These features are similar to the compositions of ultra-K S-type rhyolites, which form in extension tectonic settings.
Добавил в систему: Митяев Александр Сергеевич

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Partial Melting of Plagioclase-Free Garnet-Two-Mica Metapelite as a Model of the Formation of Ultra-K Felsic Magmas in the Continental Crustстатья

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