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The Oligocene Reference Section in the South of the East European Platform (Northern Ergeni)
Stratigraphy and Geological Correlation ( IF 1 ) Pub Date : 2019-08-19 , DOI: 10.1134/s0869593819040063
A. S. Zastrozhnov , S. V. Popov , V. N. Beniamovsky , V. A. Musatov , M. A. Akhmetiev , N. I. Zaporozhets , A. B. Bogachkin , A. S. Stolyarov

Abstract

This work presents the results of the integrated study of the sequence of Oligocene (Maikop) and underlying Eocene deposits uncovered in borehole 768 (362 m). This section can be regarded as the reference one as for Northern Ergeni, as for the entire northern part of the Eastern Paratethys. The data obtained on lithology, mollusks, and benthic foraminifers enabled us to subdivide the Oligocene interval of the Maikop Group into formations and subformations (Tsimlyanian, Solenovian, and Kalmyk), to correlate it with adjacent and remote areas of the Paratethys and with the scale of regional stages, and to reconstruct the main sedimentation conditions. On the basis of nannoplankton and dinocysts, these subdivisions are correlated with the zonal stratigraphic scale (Gradstein et al., 2012), and according to the palynological data, the evolution of climatic conditions at the Paratethys northern margin is reconstructed. The phytoplankton, foraminiferal, and paleomagnetic data show a significant reduction of the section in its Eocene interval. The latter includes only negatively magnetized intervals of the Keresta, Kuma, and Belaya Glina formations, separated by discontinuities, as well as the complete set of biotic and paleomagnetic zones of the Lower Oligocene. The lower subformation of the Solenovian Formation (50 m), eroded in most of the sections of Ciscaucasia, is characterized by unusual completeness. It is probable that the Kalmyk Formation in this section is incomplete and is represented only by the first half of the Chattian.


中文翻译:

东欧平台南部(北部埃尔金尼)的渐新世参考剖面

摘要

这项工作提出了对渐新世(Maikop)序列和井眼768(362 m)中发现的始新世沉积物进行综合研究的结果。对于北部额尔古尼,以及对东帕拉提斯山脉的整个北部,这一部分都可以视为参考部分。从岩性,软体动物和底栖有孔虫获得的数据使我们能够将Maikop组的渐新世间隔细分为地层和亚层(Tsimlyanian,Solenovian和Kalmyk),以将其与Paratethys的相邻和偏远地区以及规模相关联区域阶段,并重建主要沉积条件。根据细微浮游生物和藻类囊肿,这些细分与地层地层尺度相关(Gradstein et al。,2012),并且根据孢粉学数据,重建了Paratethys北缘的气候条件演变。浮游植物,有孔虫和古磁数据表明,该区域的始新世间隔明显减小。后者仅包括Keresta,Kuma和Belaya Glina地层的负磁化间隔,该间隔被间断点以及下渐新世的完整生物和古磁性带所分隔。索诺维安组的下部亚层(50 m)在奇卡科西亚的大部分地区被侵蚀,具有异常完整的特点。本节中的卡尔梅克组很可能是不完整的,仅由查天阶的前半部分代表。古磁数据表明该剖面的始新世间隔明显减小。后者仅包括Keresta,Kuma和Belaya Glina地层的负磁化间隔,该间隔被间断点以及下渐新世的完整生物和古磁性带所分隔。索诺维安组的下部亚层(50 m)在奇卡科西亚的大部分地区被侵蚀,具有异常完整的特点。本节中的卡尔梅克组很可能是不完整的,仅由查天阶的前半部分代表。古磁数据表明该剖面的始新世间隔明显减小。后者仅包括Keresta,Kuma和Belaya Glina地层的负磁化间隔,该间隔被间断点以及下渐新世的完整生物和古磁性带所分隔。索诺维安组的下部亚层(50 m)在奇卡科西亚的大部分地区被侵蚀,具有异常完整的特点。本节中的卡尔梅克组很可能是不完整的,仅由查天阶的前半部分代表。以及下渐新世的完整生物和古磁性带。索诺维安组的下部亚层(50 m)在奇卡科西亚的大部分地区被侵蚀,具有异常完整的特点。本节中的卡尔梅克组很可能是不完整的,仅由查天阶的前半部分代表。以及下渐新世的完整生物和古磁性带。索诺维安组的下部亚层(50 m)在奇卡科西亚的大部分地区被侵蚀,具有异常完整的特点。本节中的卡尔梅克组很可能是不完整的,仅由查天阶的前半部分代表。
更新日期:2019-08-19
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