Age and tectonic setting of the Kengurak-Sergachi gabbro-anorthosite massif (the Selenga-Stanovoi superterrane,southern frame of the Siberian craton) |
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| Authors: | I V Buchko A A Sorokin E B Sal’nikova A B Kotov A M Larin A P Sorokin S D Velikoslavinskii S Z Yakovleva |
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| Institution: | (1) Institute of Geology and Nature Management, Far East Division, Russian Academy of Sciences, Blagoveshchensk, Russia;(2) Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia |
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| Abstract: | The results of geochemical and geochronological study of the Kengurak-Sergachi gabbroanorthosite massif in the Selenga-Stanovoi superterrane, southern frame of the Siberian craton, are presented. According to geochemical peculiarities, the massif rocks are close to the autonomous “massif-type anorthosite.” The massif age corresponds to 1866 ± 6 Ma based on the results of U-Pb zircon dating. The Kengurak-Sergachi massif was intruded most likely in post-collision epoch concurrently to formation of the South Siberian giant post-collision magmatic belt (1.87–1.84 Ga) extending along the southwestern flank of the Siberian craton. |
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| Keywords: | gabbro-anorthosites geochemistry geochronology U-Pb method southern flank of the Siberian craton |
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