FINAL STAGES OF THE METAMORPHIC EVOLUTION OF THE TANAéLV BELT, KOLA PENINSULA, BALTIC SHIELD: EVIDENCE FROM U-PB DATING ON ZIRCON, TITANITE, AND RUTILE
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dc.contributor.author | Kaulina T.V. | |
dc.contributor.author | Kislitsyn R.V. | |
dc.contributor.author | Apanasevich E.A. | |
dc.date.accessioned | 2022-07-25T04:36:24Z | |
dc.date.available | 2022-07-25T04:36:24Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13461535 | |
dc.identifier.citation | Geochemistry International, 2004, 42, 6, 513-519 | |
dc.identifier.issn | 0016-7029 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38380 | |
dc.description.abstract | Field and isotopic evidence suggests the following sequence of metamorphic events for the Tanaélv belt, as determined at the Yavrozero area. The peak of high-temperature amphibolite (and, presumably, granulite) metamorphism related to the main deformation stage is constrained between 1945 ± 8 Ma (magmatic crystallization age of anorthosites) and 1928 ± 10 Ma (age of a garnet-pyroxene dike cutting across foliated anorthosites). Metamorphism of a garnet pyroxenite dike to high-temperature amphibolite facies suggests that high-temperature transformations continued after 1928 Ma. The exhumation-related decompression and cooling stage, which was marked by abundant zircon crystallization in the rocks of the Tanaélv belt and LGB, began at 1920-1916 Ma. The exhumation was followed by lower grade amphibolite metamorphism between 1909 and 1898 Ma, which was recorded in the formation of high-U zircons. Rock cooling to 450° C, as defined by the rutile age, occurred at 1880-1870 Ma. Age data on titanite and rutile having different closure temperatures of the U-Pb system made it possible to calculate the cooling gradient of the rocks from 700 to 450°C at ∼6°C/Ma. | |
dc.title | FINAL STAGES OF THE METAMORPHIC EVOLUTION OF THE TANAéLV BELT, KOLA PENINSULA, BALTIC SHIELD: EVIDENCE FROM U-PB DATING ON ZIRCON, TITANITE, AND RUTILE | |
dc.type | Статья |
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