Инд. авторы:	Sokol E.V., Polyansky O.P., Semenov A.N., Reverdatto V.V., Kokh S.N., Devyatiyarova A.S., Kolobov V.Y., Khvorov P.V., Babichev A.V.
Заглавие:	High-Grade Contact Metamorphism in the Kochumdek River Valley (Podkamennaya Tunguska Basin, East Siberia): Evidence for Magma Flow
Библ. ссылка:	Sokol E.V., Polyansky O.P., Semenov A.N., Reverdatto V.V., Kokh S.N., Devyatiyarova A.S., Kolobov V.Y., Khvorov P.V., Babichev A.V. High-Grade Contact Metamorphism in the Kochumdek River Valley (Podkamennaya Tunguska Basin, East Siberia): Evidence for Magma Flow // Russian Geology and Geophysics. - 2019. - Vol.60. - Iss. 4. - P.386-399. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.15372/RGG2019088; РИНЦ: 38693156; SCOPUS: 2-s2.0-85064972230; WoS: 000465259800002;
Реферат:	eng: Spurrite-merwinite marbles on the right bank of the Kochumdek River in the Podkamennaya Tunguska basin formed along the top margin of a flood basalt intrusion (Kuzmovka complex) from a marly limestone protolith of the Rhuddanian Lower Kochumdek Subformation, at a pressure of similar to 200 bars. The contact metamorphic aureole comprises four zones of successively decreasing temperatures marked by the respective mineral assemblages: T >= 900 degrees C (merwinite, spurrite and gehlenite (+/- rankinite, bredigite); T >= 750 degrees C (spurrite); T >= 700 degrees C (tilleyite, wollastonite, and melilite (Gehl(<50))); and similar to 500-550 degrees C (diopside, amphibole, and grossular). Very high temperatures at the contact (T-cont > 2/3 T-melt) result from magma flow along a conduit. The temperature profiles for the Kochumdek metamorphic complex show good fit between measured and geothermometer-derived values at a magma temperature of 1200 degrees C, an intrusion thickness of >= 40 m, a heating time of six months, and a magma flow lifespan within one month. Stagnant magma in a conduit of any thickness cools down and crystallizes rapidly and fails to heat up sediments to the temperatures required for spurrite-merwinite metamorphism (above 790 degrees C).
Ключевые слова:	XENOLITHS; EQUILIBRIA; FLUID-FLOW; East Siberia; MODEL; simulation; Kuzmovka complex traps; spurrite-merwinite facies; contact metamorphism; indicator minerals; SILLS;
Издано:	2019
Физ. характеристика:	с.386-399