Formation Conditions of Basic Granulites and High-Alumina Gneiss of the Baikal–Muya Belt (Northern Baikal Area)
| Autor: | Yu. M. Lebedeva, A. A. Andreev, S. D. Velikoslavinsky, V. A. Glebovitsky, E. V. Tolmacheva, E. S. Bogomolov, E. Yu. Rytsk |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
geography
geography.geographical_feature_category Rift 010504 meteorology & atmospheric sciences Metamorphic rock Geochemistry Schist Massif 010502 geochemistry & geophysics Granulite 01 natural sciences Facies Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Metamorphic facies Geology 0105 earth and related environmental sciences Gneiss |
| Zdroj: | Doklady Earth Sciences. 479:342-346 |
| ISSN: | 1531-8354 1028-334X |
| DOI: | 10.1134/s1028334x18030054 |
| Popis: | The Kichera zone of the Baikal–Muya Belt consists of alternating tectonic plates with rocks of different metamorphic facies. Garnet–cordierite–sillimanite gneiss from the tectonic fragment in granite–gneiss of the Baikal massif with an age of 755 ± 15 Ma from the Goremyka plate and two-pyroxene schist of the granulite complex with an age of 617 ± 5 Ma from the Boguchan plate were studied. Thermobarometric studies of these key metamorphic rocks were carried out using the avPT (THERMOCALC) and TWEEQU (TWQ 2.01) methods. The P–T parameters estimated for the cordierite⎯sillimanite gneiss of the Goremyka plate correspond to the boundary between the amphibolite and granulite facies. Granulites of the Boguchan plate belong to the HT–LP type. Exhumation of metamorphic rocks could be caused by extension upon the evolution of the Late Baikal rifting. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|