P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION
https://doi.org/10.5800/GT-2021-12-2-0526
Abstract
The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz). The pseudosection-based thermobarometry yields peak metamorphic temperature and pressure values (T=950 °C, P=~9 kbar) and suggests near-isobaric cooling (IBC) conditions during the retrograde evolution of the granulites. The U/Pb zircon age estimates for metamorphism (~1.87 Ga) support the data published by other researchers. The SHRIMP-II U-Pb dating of zircon cores yields a minimum protolith age of 1.94–1.91 Ga. Biotites and amphiboles from granulites of Cape Kaltygei show the 40Ar/39Ar isotopic ages that are close to the Early Paleozoic accretion-collision system of the Western Baikal region.
Keywords
Cape Kaltygei,
Western Baikal region,
UHT granulites,
P–T pseudosections,
U-Pb and Ar-Ar geochronology
Supporting agencies: The study was carried out under the state assignment of the Institute of Geology and Mineralogy SB RAS.
About the Authors
N. I. Volkova
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
E. I. Mikheev
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
1 Pirogova St, Novosibirsk 630090
A. V. Travin
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University; Tomsk State University
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
1 Pirogova St, Novosibirsk 630090
36 Lenin Ave, Tomsk 634050
A. G. Vladimirov
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Tomsk State University
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
36 Lenin Ave, Tomsk 634050
A. S. Mekhonoshin
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Irkutsk National Research Technical University
Russian Federation
Russian Federation
1а Favorsky St, Irkutsk 664033
83 Lermontov St, Irkutsk 664074
V. V. Khlestov
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
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Volkova N.I., Mikheev E.I., Travin A.V., Vladimirov A.G., Mekhonoshin A.S., Khlestov V.V. P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION. Geodynamics & Tectonophysics. 2021;12(2):310-331. (In Russ.) https://doi.org/10.5800/GT-2021-12-2-0526
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