Geological structure of the Pre-jurassic basement of the Yugansk-Koltogorsk zone of the West Siberia

Q4 Earth and Planetary Sciences
K. Ivanov, S. Berzin, N. V. Vakhrusheva, N. Kostrov, O. Pogromskaya
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引用次数: 1

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.
西西伯利亚尤甘斯克-科尔托戈尔斯克地区前侏罗纪基底地质构造
研究对象。我们对尤甘斯克-科尔托戈尔斯克(西西伯利亚中部)岩石复合体的岩石学、岩石化学、地球化学、地质年代学和生物地层学进行了进一步的勘探。材料和方法。材料为钻穿前侏罗统基底杂岩井的岩心样品,使用的方法如下:x射线光谱显微分析(Cameca SX 100, JEOL-733 Superprobe);岩石的硅酸盐分析(СРМ-18和EDX-100);电感耦合等离子体质谱(ICP-MS) (ELAN-9000和Element2);采用高分辨率离子探针SHRIMP-II (U-Pb)对锆石进行分析;用Micromass 5400进行Ar-Ar测年;结果绘制了西西伯利亚板块中部尤干—科尔托戈尔带1:50万比例尺的地质图。该地图是一组信息地质,地球物理和其他层。确定花岗岩年龄为早二叠世,裂谷带玄武岩开始形成于268.4±7.5 Ma (Ar-Ar)。结论。西西伯利亚巨型基底轴向裂谷带的火山活动开始时间早于研究前的估计,西伯利亚台地圈闭玄武岩的火山活动开始时间明显早于研究前的估计。
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来源期刊
Litosfera
Litosfera Earth and Planetary Sciences-Geophysics
CiteScore
0.70
自引率
0.00%
发文量
39
审稿时长
12 weeks
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