埃塞拉山谷早、中始新世的过渡

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2022-07-12 DOI:10.1344/geologicaacta2022.20.6
A. Barnolas, A. Rodríguez-Pintó, G. Bernaola, Emilio L. Pueyo, J. Tosquella, P. Arbués, R. Scholger
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引用次数: 3

摘要

本文对磁地层学、大型底栖有孔虫和钙质纳米化石生物地层学进行了综合研究。这项工作是在Ésera山谷(比利牛斯山脉中南部)Ypresian/Lutetian边界附近富含大型有孔虫的浅海硅塑料中进行的。虽然研究层段的钙质纳米化石含量较低,无法识别精确的Y/L边界,但所发现的分类群足以支持年代地层归属。通过C21时间,在Ésera流域剖面获得的数据提高了对大型底栖有孔虫(nummulites和Assilina)分布的认识。sbz11到sbz12的转变发生在最低的C21r,如之前的工作所示。sbz12组合延伸到C21n,在那里出现了sbz12和sbz13的边界。这些数据是在浅海硅岩相中获得的,具有原位动物群,结果表明sbz12 / sbz13边界向下鲁特梯的移动,比以前认为的要早。因此,Ypresian/Lutetian边界出现在sbz12。
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The early middle Eocene transition at the Esera valley
An integrated study including magnetostratigraphy, larger benthic foraminifera and calcareous nannofossil biostratigraphy is presented herein. This work was performed in shallow marine siliciclastics rich in larger foraminifera, around the Ypresian/Lutetian boundary in the Ésera valley (South-Central Pyrenees). Although the calcareous nannofossil content in the studied interval is low, not allowing a precise Y/L boundary to be recognised, the taxa found are enough to support the chronostratigraphic attribution. Data obtained in the Ésera valley section has improved the knowledge of larger benthic foraminifera (Nummulitesand Assilina) distribution through chron C21. SBZ 11 to SBZ 12 transition took place at the lowermost C21r, as shown in previous works. SBZ 12 assemblages extend into C21n, where the SBZ 12 to SBZ 13 boundary occurs. These data, obtained in shallow marine siliciclastic facies, with in situ fauna, results in a shift of the SBZ 12/SBZ 13 boundary to the Lower Lutetian, younger than previously believed. Accordingly, the Ypresian/Lutetian boundary occurs in SBZ 12.
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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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