1. Formation Conditions of Basic Granulites and High-Alumina Gneiss of the Baikal-Muya Belt (Northern Baikal Area).
- Author
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Lebedeva, Yu. M., Rytsk, E. Yu., Glebovitsky, V. A., Velikoslavinsky, S. D., Bogomolov, E. S., Tolmacheva, E. V., and Andreev, A. A.
- Subjects
GRANULITE ,GNEISS ,GARNET ,CORDIERITE ,METAMORPHIC rocks - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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