| Инд. авторы: | Likhanov I.I., Reverdatto V.V. |
| Заглавие: | Evidence of Middle Neoproterozoic Extensional Tectonic Settings along the Western Margin of the Siberian Craton: Implications for the Breakup of Rodinia |
| Библ. ссылка: | Likhanov I.I., Reverdatto V.V. Evidence of Middle Neoproterozoic Extensional Tectonic Settings along the Western Margin of the Siberian Craton: Implications for the Breakup of Rodinia // Geochemistry International. - 2015. - Vol.53. - Iss. 8. - P.671-689. - ISSN 0016-7029. - EISSN 1531-8397. |
| Внешние системы: | DOI: 10.1134/S0016702915080030; РИНЦ: 23995600; SCOPUS: 2-s2.0-84938405235; WoS: 000360069700001; |
| Реферат: | eng: The new results of U-Pb and Ar-40/Ar-39 dating and petrological and geochemical studies of rocks from the Yenisey regional shear zone (YRSZ) in the Transangarian part of the Yenisey Ridge were used to identify a dike belt at the western margin of the Siberian craton and constrain the timing of formation of rift-related structures accompanied by within-plate magmatism. The magmatism of this epoch produced felsic and mafic intrusive rocks. The extension processes are recorded by the 797-787 Ma dike swarms. The rift origin of the rocks studied here is confirmed by their occurrence as dikes and sills confined to the YRSZ, bimodal composition of magmatic rock associations, and petrochemical characteristics of rocks typical of within-plate settings. The formation of the 800 Ma dike belt within the study area could be associated with the Neoproterozoic extensional tectonic events along the western margin of the Siberian craton which coincided with the onset of the breakup of the Rodinia supercontinent. These events provide the upper age limit for the collisional metamorphism that took place at the final stage of orogeny. The evolutionary phases identified in the region agree well with the sequence and style of tectonothermal events within the Valhalla Orogen at the Arctic margin of Rodinia and provide further support for the spatial proximity between Siberia and North Atlantic cratons during this epoch, as indicated by recent paleomagnetic data.
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| Ключевые слова: | EXHUMATION RATE; EASTERN SIBERIA; GEOCHEMICAL SIGNATURES; POLYMETAMORPHIC COMPLEX; COLLISIONAL METAMORPHISM; U-PB; PRECAMBRIAN FE-RICH; AL-RICH METAPELITES; MAGMATIC EVENT; breakup of Rodinia; Siberian craton; Yenisey Ridge; within-plate magmatism; dike swarms; U-Pb and Ar-40/Ar-39 geochronology; Neoproterozoic; TRANSANGARIAN YENISEI RIDGE; |
| Издано: | 2015 |
| Физ. характеристика: | с.671-689 |