ZONAL METAMORPHISM AND PETROLOGY OF METAPELITES IN THE TIM-YASTREBOVSKAYA STRUCTURE, VORONEZH CRYSTALLINE MASSIF
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dc.contributor.author | Savko K.A. | |
dc.contributor.author | Polyakova T.N. | |
dc.date.accessioned | 2021-02-24T07:48:20Z | |
dc.date.available | 2021-02-24T07:48:20Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13383272 | |
dc.identifier.citation | Petrology, 2001, 9, 6, 516-533 | |
dc.identifier.issn | 0869-5911 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25577 | |
dc.description.abstract | Our detailed petrographic study of the Early Proterozoic metapelites of the Tim-Yastrebovskaya structure resulted in distinguishing the following four metamorphic zones: garnet-chlorite, staurolite-andalusite. staurolite-sillimanite, and sillimanite-muscovite. The zoning mapped in the area is noted for the fact that its Mn-rich metapelites contain the assemblage of Fe-Mn garnet with andalusite in place of staurolite. Based on its morphology, composition, and zoning, the garnet of the rocks can be subdivided into two types: early kinematic with prograde zoning and late kinematic with retrograde zoning or unzoned. The results of microthermometry and mineralogical thermobarometry led us to conclude that the metapelites of the Tim-Yas-trebovskaya structure were affected by two metamorphic events. During the early episode, which was related to folding at 2250 Ma, the metasediments were regionally metamorphosed to the garnet-chlorite grade (zone). The intrusion of large granodiorite bodies at 2086 Ma induced the second metamorphic episode, during which the metapelites were metamorphosed at 520-620 degreesC and 3-4 kbar. | |
dc.subject | Proterozoic | en |
dc.title | ZONAL METAMORPHISM AND PETROLOGY OF METAPELITES IN THE TIM-YASTREBOVSKAYA STRUCTURE, VORONEZH CRYSTALLINE MASSIF | |
dc.type | Статья | |
dc.subject.age | Precambrian::Proterozoic | en |
dc.subject.age | Докембрий::Протерозой | ru |
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