Lower Eocene sedimentary succession and microfossil biostratigraphy in the central northern Caucasus basin

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2020-01-29 DOI:10.1344/geologicaacta2020.18.1
E. Shcherbinina, A. Iakovleva, Y. Gavrilov, O. Golovanova, N. Muzylev
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引用次数: 4

Abstract

The lower Eocene sediments from the classical Paleogene section exposed along the Kheu River, northern Caucasus, southern Russia are here studied. This ca. 50m thick succession is lithologically contrasting: the lower and upper parts are composed by soft marls separated by a thick Radiolaria-rich unit of non-calcareous and low-calcareous mudstones with intercalations of compact cherty layers. According to nannofossil and dinocyst biostratigraphy, the unique intercalation of Total Organic Carbon (TOC)-rich sediment (sapropelitic bed) in the lower part of the lower Eocene correspond to the Paleocene-Eocene Thermal Maximum (PETM) and a series of sapropelitic interlayers in the upper marly part of the lower Eocene succession correlates with the Early Eocene Climatic Optimum (EECO). The study of nannofossil and dinocyst assemblages enabled detailed zonal subdivision and first-order calibration of nannofossil and dinocyst bio-events during this time-span. The studied interval of the section embraces the complete succession of nannofossil zones NP9-NP13 of Martini, 1971, CP8-CP11 of Okada and Bukry, 1980 and CNP11-CNE5 of Agnini et al., 2014. By means of dinocyst stratigraphy, the succession of Apectodinium hyperacanthum, Axiodinium augustum, Deflandrea oebisfeldensis, Dracodinium astra, Stenodinium meckelfeldense, Dracodinium varielongitudum, Ochetodinium romanum/Samlandia chlamydophora and Areosphaeridium diktyoplokum zones are identified in the Ypresian part of the Kheu section.
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北高加索盆地中部下始新世沉积演替与微化石生物地层学
本文对俄罗斯南部高加索北部Kheu河沿岸暴露的古近纪经典剖面始新世下部沉积物进行了研究。这个约50米厚的层序在岩性上形成对比:下部和上部由软泥灰岩组成,中间隔着一层富含放射虫的厚的非钙质和低钙质泥岩单元,中间嵌有致密的硅质层。根据纳米化石和恐龙囊生物地层学,下始新统下部独特的富总有机碳(TOC)沉积物(腐泥质层)夹层与古新统—始新统极热期(PETM)相对应,下始新统上部灰岩层的一系列腐泥质夹层与早始新统气候最适期(EECO)相对应。通过对纳米化石和恐龙囊组合的研究,可以对这段时间内的纳米化石和恐龙囊生物事件进行详细的分区划分和一级校准。剖面研究层序包括1971年Martini的NP9-NP13、1980年Okada和Bukry的CP8-CP11、2014年Agnini等的CNP11-CNE5等纳米化石带的完整演替。利用生物囊层序,在Kheu剖面上确定了Apectodinium hyperacanthum、Axiodinium augustum、Deflandrea oebisfeldensis、Dracodinium astra、Stenodinium meckelfeldense、Dracodinium varielongitudum、Ochetodinium romanum/Samlandia chlamydophora和Areosphaeridium diktyoplokum带的演替。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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