P-T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION

被引：1
作者：
Volkova, N., I [1 ]
Mikheev, E., I [1 ,2 ]
Travin, A., V [1 ,2 ,3 ]
Vladimirov, A. G. [1 ,3 ]
Mekhonoshin, A. S. [4 ,5 ]
Khlestov, V. V. [1 ]
机构：
[1] Russian Acad Sci, Siberian Branch, Sobolev Inst Geol & Mineral, 3 Academician Koptyug Ave, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, 1 Pirogova St, Novosibirsk 630090, Russia
[3] Tomsk State Univ, 36 Lenin Ave, Tomsk 634050, Russia
[4] Russian Acad Sci, Siberian Branch, Vinogradov Inst Geochem, 1a Favorsky St, Irkutsk 664033, Russia
[5] Irkutsk Natl Res Tech Univ, 83 Lermontov St, Irkutsk 664074, Russia
来源：
GEODYNAMICS & TECTONOPHYSICS | 2021年 / 12卷 / 02期
关键词：
Cape Kaltygei; Western Baikal region; UHT granulites; P-T pseudosections; U-Pb and Ar-Ar geochronology; OLKHON REGION; SIBERIAN CRATON; THERMOCHRONOLOGY; EVOLUTION; SHRIMP; ZONE;
D O I：
10.5800/GT-2021-12-2-0526
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
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 degrees C, P=similar to 9 kbar) and suggests near-isobaric cooling (IBC) conditions during the retrograde evolution of the granulites. The U/Pb zircon age estimates for metamorphism (similar to 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.
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页码：310 / +
页数：22
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