| Autor: |
N. I. Volkova, E. I. Mikheev, A. V. Travin, A. G. Vladimirov, A. S. Mekhonoshin, V. V. Khlestov |
| Jazyk: |
English<br />Russian |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Геодинамика и тектонофизика, Vol 12, Iss 2, Pp 310-331 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2078-502X |
| DOI: |
10.5800/GT-2021-12-2-0526 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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