P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION
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 pr...
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2021-06-01
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| Series: | Геодинамика и тектонофизика |
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| Online Access: | https://www.gt-crust.ru/jour/article/view/1213 |
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| author | N. I. Volkova E. I. Mikheev A. V. Travin A. G. Vladimirov A. S. Mekhonoshin V. V. Khlestov |
| author_facet | N. I. Volkova E. I. Mikheev A. V. Travin A. G. Vladimirov A. S. Mekhonoshin V. V. Khlestov |
| author_sort | N. I. Volkova |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-2cadf74cf59c4d0ea9aef6893e9c0054 |
| institution | Kabale University |
| issn | 2078-502X |
| language | English |
| publishDate | 2021-06-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj-art-2cadf74cf59c4d0ea9aef6893e9c00542025-08-20T03:37:06ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2021-06-0112231033110.5800/GT-2021-12-2-0526527P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGIONN. I. Volkova0E. I. Mikheev1A. V. Travin2A. G. Vladimirov3A. S. Mekhonoshin4V. V. Khlestov5Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversitySobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University; Tomsk State UniversitySobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Tomsk State UniversityVinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Irkutsk National Research Technical UniversitySobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesThe 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.https://www.gt-crust.ru/jour/article/view/1213cape kaltygeiwestern baikal regionuht granulitesp–t pseudosectionsu-pb and ar-ar geochronology |
| spellingShingle | N. I. Volkova E. I. Mikheev A. V. Travin A. G. Vladimirov A. S. Mekhonoshin V. V. Khlestov P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION Геодинамика и тектонофизика cape kaltygei western baikal region uht granulites p–t pseudosections u-pb and ar-ar geochronology |
| title | P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION |
| title_full | P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION |
| title_fullStr | P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION |
| title_full_unstemmed | P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION |
| title_short | P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION |
| title_sort | p t conditions u pb and 40ar 39ar isotopic ages of uht granulites from cape kaltygei western baikal region |
| topic | cape kaltygei western baikal region uht granulites p–t pseudosections u-pb and ar-ar geochronology |
| url | https://www.gt-crust.ru/jour/article/view/1213 |
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