Peculiarities of the structure and evolution of the Riphean Ai volcanic complex,South Urals |
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| Authors: | Al V Tevelev I A Kosheleva A O Khotylev Ark V Tevelev I A Prudnikov |
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| Institution: | 1. Department of Geology, Moscow State University, Moscow, 119991, Russia
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| Abstract: | The Ai volcanic complex is a part of the Ai Formation, which begins the stratotypical Riphean section in the South Urals and lies on the Archean Taratash metamorphic complex. New geochemical and isotope data were obtained for the volcanic rocks. The dominant porphyritic plagioclase and pyroxene trachibasalts associated with dacites are characterized by higher contents of alkalis and titanium, which is typical of rift volcanism. However, other geochemical data, e.g., decreased Ni contents, are beyond of this scheme. The U-Pb (SHRIMP) age of zircons from dacites is 1415 ± 11 Ma. |
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