期刊
COMPTES RENDUS PALEVOL
卷 20, 期 35, 页码 741-759出版社
ACAD SCIENCES
DOI: 10.5852/cr-palevol2021v20a35
关键词
Conodont biofacies; sea-level changes; La Silla Formation; San Juan Formation; Ordovician; Argentine Precordillera
类别
资金
- CONICET
- Universidad Nacional de Cordoba
Conodonts from the upper La Silla and San Juan formations at the Cerro La Silla section were analyzed to identify faunal dynamics, biofacies, and sea-level changes. The study revealed seven distinct biofacies and two transgressive events in the San Juan Formation at the Cerro La Silla section.
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 duster 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).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据