Geological structure of the Pre-jurassic basement of the Yugansk-Koltogorsk zone of the West Siberia
| Autor: | Nikolai P. Kostrov, Olga E. Pogromskaya, Kirill S. Ivanov, Stepan V. Berzin, Nadezhda V. Vakhrusheva |
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| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Permian Stratigraphy Geochemistry Biostratigraphy 010502 geochemistry & geophysics 01 natural sciences permian-triasic basalts Petrography pre-jurassic basement u-pb lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction Geochemistry and Petrology tectonics geochemistry 0105 earth and related environmental sciences west-siberian basin Geology Geologic map Geophysics Basement (geology) Petrochemistry oil and gas bearing lcsh:TA703-712 Geochronology mineralogy Rift zone ar-ar age |
| Zdroj: | Литосфера, Vol 0, Iss 6, Pp 839-858 (2018) |
| ISSN: | 2500-302X 1681-9004 |
| DOI: | 10.24930/1681-9004-2018-18-6-839-858 |
| Popis: | Subject of the study.We have carried out an additional exploration on petrography, petrochemistry, geochemistry, geochronology and biostratigraphy of rock complexes of the Yugansk-Koltogorsk (central part of West Siberia).Materials and methods.The materials are core samples from wells that penetrated the Pre-Jurassic basement rock complexes The used methods are as follows: X-ray spectrum microanalysis (Cameca SX 100, JEOL-733 Superprobe); the silicate analysis of the rocks (СРМ-18 and EDX-100); mass-spectroscopy with inductively coupled plasma (ICP-MS) (ELAN-9000 and Element2); zircons were analysed with a high resolution ionic microprobe SHRIMP-II (U-Pb); Ar-Ar dating was carried out by Micromass 5400; biostratigraphy, petrochemestry.Results.A geological map of Yugan-Koltogor zone of the central part of West-Siberian plate in a scale 1:500 000 was created. The map is a set of informational geological, geophysical and other layers. It was established that age of granites is Early Permian, the basalts of the rift zone began to form 268.4 ± 7.5 Ma ago (Ar-Ar). Conclusions. Volcanism in the axial rift zones of the West-Siberian megabasin basement began earlier than it is supposed before our study and significantly earlier of that of trap basalts of Siberian platform. |
| Databáze: | OpenAIRE |
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