Abstract
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.
Highlights
We have carried out an additional exploration on petrography, petrochemistry, geochemistry, geochronology and biostratigraphy of rock complexes of the Yugansk-Koltogorsk
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
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
Summary
Изучение керна глубоких скважин проводилось в ИГГ УрО РАН. Химический состав минералов изучен методом рентгеноспектрального микроанализа на приборах CAMECA SX 100 Силикатный анализ пород проведен рентгеноспектральным методом на приборе EDX-100 Геохимические характеристики пород получены методом масс-спектрометрии с индуктивно-связанной плазмой (ICP-MS) на приборах ELAN-9000 и Element U-Pb датирование единичных кристаллов циркона осуществлялось на ионном микрозонде SHRIMP-II в Центре изотопных исследований ВСЕГЕИ по методике [Williams, 1998; Larionov et al, 2004]. Отобранные вручную при помощи оптического микроскопа, помещались в эпоксидную матрицу совместно со стандартными цирконами 91500 и TEMORA. Датирование проб Ar-Ar методом проводилось в ИГМ СО РАН K-Ar датирование производилось в ИГГ УрО РАН. Содержание калия определялось на рентгенофлуоресцентном спектрометре СРМ-18. Содержание радиогенного аргона выполнено на масс-спектрометре МИ-1330 с использованием трассера, обогащенного изотопом 38Ar. При расчете возрастов использованы константы, принятые в 1976 г
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