Upper Viséan and Serpukhovian Biostratigraphy and Lithofacies of the Southeast of the East European Platform
Upper Viséan and Serpukhovian Biostratigraphy and Lithofacies of the Southeast of the East European Platform
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DOI：
10.1134/s0869593819060030
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发表时间：
2019-11
影响因子：
1
通讯作者：
E. Kulagina;E. N. Gorozhanina;V. Gorozhanin;T. Filimonova
中科院分区：
文献类型：
--
作者：
E. Kulagina;E. N. Gorozhanina;V. Gorozhanin;T. Filimonova
摘要本文报道了欧伦堡州索尔-伊列茨克隆起（Sol-Iletsk Swell）周围东欧地台东南部钻孔下石炭统上vissamim和Serpukhovian矿床的生物地层学和沉积学新资料。通过岩石岩性分析，确定了研究区内的次垂直相带。在Sol-Iletsk膨胀区和前拉利亚前深的近侧带，沉积物以厚达500 m的浅海陆架相为代表。向南，在北伯利古宙边缘，其厚度急剧减少至36 m，演替由较深陆架的碳酸盐-粘土沉积物组成。在有孔虫和牙形刺的基础上，根据东欧地台地层方案的区域亚阶段，对上vissaman和Serpukhovian进行了细分，并确定了有孔虫带。开放陆架高能浅水相的Serpukhovian基底是由有孔虫janischewskina delicataandEndothyranopsis plana的进入所形成的；在较低能量相中，它位于新古铁饼（neoarchaediscus postrugosus）首次出现的水平；在较深陆架的粘土-碳酸盐岩相中，根据牙状齿lochriea ziegleri的外观进行绘制。讨论了5个钻孔中微动物群的分布、有孔虫的地带性组合特征及区域间对比。
AbstractThis paper presents new data on the biostratigraphy and sedimentology of upper Viséan and Serpukhovian deposits (Lower Carboniferous) from boreholes in the southeast of the East European Platform around the Sol-Iletsk Swell (Orenburg oblast). Using rock lithology, sublatitudinal facies zones are recognized in the studied area. The deposits are represented by open shallow shelf facies, up to 500 m thick, in the area of the Sol-Iletsk Swell and near-side zone of the Preuralian Foredeep. To the south, at the margin of the Northern Pericaspian, their thickness sharply decreases to 36 m, and the succession is composed of carbonate-clay sediments of the relatively deep shelf. On the basis of foraminifers and conodonts, the upper Viséan and Serpukhovian are subdivided using the regional substages of the stratigraphic scheme of the East European Platform, and foraminiferal zones are recognized. The base of the Serpukhovian in the high-energy shallow-water facies of the open shelf is drawn by the entry of the foraminifersJanischewskina delicataandEndothyranopsis plana; in lower energy facies, it is placed at the level of the first appearance ofNeoarchaediscus postrugosus; in the clay-carbonate facies of the relatively deep shelf, it is drawn according to the appearance of the conodontLochriea ziegleri. The distribution of microfauna from five boreholes, the characteristics of the foraminiferal zonal assemblages, and the interregional correlation are discussed.