Geochemical features of felsic magmatism on the northwestern flank of the Khingan-Okhotsk volcanoplutonic belt: Ezop and Yam-Alin zones |
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| Authors: | I M Derbeko A A Sorokin S G Agafonenko |
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| Institution: | (1) Institute of Geology and Nature Management, Far East Division, Russian Academy of Sciences, Blagoveshchensk, Russia;(2) Federal State Unitary Geological Company “Amurgeologiya,” Ministry of Natural Resources of the Russian Federation, Blagoveshchensk, Russia |
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| Abstract: | The Ezop-Yam-Alin zone was studied with emphasis on the geology, composition, and age of its felsic volcanic and intrusive rocks. All these rocks are moderately enriched in Rb (84–268 ppm), Ba (240–881 ppm), Th (10.5–17.9 ppm), and REE and depleted in Nb (5–12 ppm), Ta (0.5–1.2 ppm), and Zr (92–175 ppm). The age dates obtained by U-Pb (94.8 ± 2.2 Ma) and Rb-Sr (95.2 ± 0.69 Ma) methods for the granites of the Ezop Complex correspond to the Cenomanian. |
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| Keywords: | voclanoplutonic area felsic magmatism geochemistry Khingan-Okhotsk belt |
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