Formation Conditions of Basic Granulites and High-Alumina Gneiss of the Baikal–Muya Belt (Northern Baikal Area)
- Authors: Lebedeva Y.M.1, Rytsk E.Y.1, Andreev A.A.2, Glebovitsky V.A.1, Velikoslavinsky S.D.1, Bogomolov E.S.1, Tolmacheva E.V.1
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Affiliations:
- Institute of Precambrian Geology and Geochronology
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
- Issue: Vol 479, No 1 (2018)
- Pages: 342-346
- Section: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/192481
- DOI: https://doi.org/10.1134/S1028334X18030054
- ID: 192481
Cite item
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.
About the authors
Yu. M. Lebedeva
Institute of Precambrian Geology and Geochronology
Author for correspondence.
Email: lebedeva_J@mail.ru
Russian Federation, St. Petersburg, 199034
E. Yu. Rytsk
Institute of Precambrian Geology and Geochronology
Email: lebedeva_J@mail.ru
Russian Federation, St. Petersburg, 199034
A. A. Andreev
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
Email: lebedeva_J@mail.ru
Russian Federation, Moscow, 119017
V. A. Glebovitsky
Institute of Precambrian Geology and Geochronology
Email: lebedeva_J@mail.ru
Russian Federation, St. Petersburg, 199034
S. D. Velikoslavinsky
Institute of Precambrian Geology and Geochronology
Email: lebedeva_J@mail.ru
Russian Federation, St. Petersburg, 199034
E. S. Bogomolov
Institute of Precambrian Geology and Geochronology
Email: lebedeva_J@mail.ru
Russian Federation, St. Petersburg, 199034
E. V. Tolmacheva
Institute of Precambrian Geology and Geochronology
Email: lebedeva_J@mail.ru
Russian Federation, St. Petersburg, 199034