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Radiolarian Biostratigraphy of the Bazhenovo Regional Substage (Upper Jurassic–Lower Cretaceous) of Western Siberia
Stratigraphy and Geological Correlation ( IF 1 ) Pub Date : 2020-11-27 , DOI: 10.1134/s0869593820060106
V. S. Vishnevskaya , E. O. Amon , Yu. A. Gatovsky

Abstract

On the basis of published and new data, the features of the history of study of radiolarians and their stratigraphic distribution in the Upper Jurassic–Lower Cretaceous Bazhenovo Regional Substage (Tithonian–Berriasian) of the West Siberian depositional basin are summarized and analyzed. A general geological characteristic of the Bazhenovo Formation is given. The previous regional schemes are briefly characterized. For the first time, radiolarians were studied using SEM. It is proposed to consider five radiolarian-based units: (1) Parvicingula antoshkinae–P. blowi Zone, the lower Volgian and the lower part of the middle Volgian (lower Tithonian–lower part of the middle Tithonian); (2) Parvicingula jonesi–P. excelsa Zone, the middle Volgian (the middle Tithonian–the lowermost upper Tithonian; (3) Parvicingula rotunda–P. alata Zone, the upper Volgian (the uppermost Tithonian, possibly including the lower part of the Berriasian); (4) Parvicingula khabakovi–Williriedellum salymicum Zone, the uppermost Volgian–Ryazanian (the Berriasian); (5) Williriedellum Bed, the uppermost Ryazanian–Valanginian (the Berriasian–Valanginian). The age of all units is confirmed by rare ammonite occurrences. However, the stratigraphic position of two units (Parvicingula antoshkinae–P. blowi Zone and Williriedellum Bed) still requires clarification and additional justification.



中文翻译:

西西伯利亚Bazhenovo区域子侏罗纪-下白垩统的放射虫生物地层学

摘要

根据已发布的和新的数据,总结并分析了西西伯利亚沉积盆地上侏罗统-下白垩统巴真诺沃地区亚阶(提通-贝里亚斯地区)放射虫研究的历史特征及其地层分布。给出了Bazhenovo组的一般地质特征。先前的区域计划已被简要描述。首次使用SEM研究了放射虫。建议考虑五个以放射虫为基础的单位:(1)Parvicingula antoshkinae–P。吹牛地带,下伏尔古纪和中伏尔纪的下部(下提通统-中提通统的下部);(2)Parvicingula jonesi–P。excelsa区域,中部沃尔格山脉(中部Tithonian-最低的上部Tithonian;(3)圆形圆形大厅-P. alata Zone,上伏尔古纪(最高的铁通人,可能包括贝里亚斯山脉的下部);(4)Parvicingula khabakovi–Williriedellum salymicum带,最上层的Volgian–Ryazanian(Berriasian);(5)Williriedellum床,最上层的梁赞-瓦朗吉尼(Berriasian-瓦朗吉尼)。所有单位的年龄都由罕见的亚铁矿事件证实。但是,两个单元(Parvicingula antoshkinae–P。blowi Zone和Williriedellum Bed)的地层位置仍需要澄清和补充说明。所有单位的年龄都由罕见的亚铁矿事件证实。但是,两个单元(Parvicingula antoshkinae–P。blowi Zone和Williriedellum Bed)的地层位置仍需要澄清和补充说明。所有单位的年龄都由罕见的亚铁矿事件证实。但是,两个单元(Parvicingula antoshkinae–P。blowi Zone和Williriedellum Bed)的地层位置仍需要澄清和补充说明。

更新日期:2020-11-27
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