Alkaline rocks of Meso-Cenozoic volcanosedimentary complex of the West Siberian Plate: petrologic composition |
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| Affiliation: | 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, PR China;2. Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, PR China;3. Yunnan Chihong Resources Exploration and Development Limited Liability Company, Qujing 6550000, PR China;4. Key Laboratory of Orogen and Crust Evolution, Ministry of Education, Peking University, Beijing 100871, PR China |
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| Abstract: | This paper is concerned with study of tephriphonolites, rare rocks that have been first found in the pre-Jurassic basement of West Siberia. Based on geological observations of the bedding of different types of volcanics and their geochemical peculiarities, the conclusion about the synchronous occurrence of subalkaline and alkaline volcanism is drawn. This is confirmed by the coexistence of compositionally contrasting volcanics in the borehole section. The hypothesis is put forward that these rocks alternate in the section, as is the case in the Tunguska syneclise of the Siberian Platform. The new data on Sr and Nd isotopy suggest the participation of crustal material in the formation of alkaline rocks. The rift nature of the regional intraplate volcanism is confirmed. |
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