Ordovician conodont biofacies of the upper La Silla and San Juan formations (middle Tremadocian-lower Dapingian) at Cerro La Silla, Argentine Precordillera

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2021-08-27 DOI:10.5852/cr-palevol2021v20a35

M. Mango, undefined Guillermo L. Albanesi

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引用次数: 3

Abstract

Conodonts from the upper La Silla (9.6 m thick) and San Juan formations (264.7 m thick) at the Cerro La Silla section are analyzed for the identification of faunal dynamics, biofacies and sea-level changes. The conodont collection of 11 388 specimens was recovered after digestion of 41 samples of carbonate rocks, totalizing 88.155 kg. Conodont total abundance and generic diversity graphs, as well as cluster analysis, reveal seven biofacies. The Colaptoconus, Tropodus-Reutterodus, Oepikodus-Prioniodus, Juanognathus-Bergstroemognathus, Juanognathus-Oepikodus-Protopanderodus, Juanognathus-Protopanderodus, Juanognathus-Semiacontiodus biofacies are determined. These biofacies represent middle to outer carbonate ramp environments for the San Juan Formation. The associated analysis of biofacies and lithology allow for the recognition of two transgressive events in the San Juan Formation at the Cerro La Silla section, which could be related to transgressive systems tracts (TST) that occurred during the Early and Middle Ordovician (middle Tremadocian-early Dapingian).

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阿根廷前科迪勒拉Cerro La Silla地区奥陶系上拉西拉组和圣胡安组(特雷马多世-大平纪下)牙形石生物相

分析了Cerro La Silla剖面上La Silla组(9.6 m厚)和San Juan组(264.7 m厚)的牙形刺，以确定动物动态、生物相和海平面变化。对碳酸盐岩样品41件进行消化后，回收牙形石标本11 388件，总重量为88.155 kg。牙形石总丰度和属多样性图以及聚类分析显示了7种生物相。确定了Colaptoconus、Tropodus-Reutterodus、Oepikodus-Prioniodus、Juanognathus-Bergstroemognathus、Juanognathus-Oepikodus-Protopanderodus、Juanognathus-Protopanderodus、Juanognathus-Semiacontiodus生物相。这些生物相代表了圣胡安组中至外碳酸盐岩斜坡环境。通过生物相和岩性分析，确定了Cerro La Silla剖面圣胡安组的两次海侵事件，可能与早、中奥陶世(特雷马多世—大平世早期)的海侵体系域(TST)有关。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.