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

被引：4
作者：
Mango, Matias J. [1 ]
Albanesi, Guillermo L. [1 ]
机构：
[1] Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, CIGEA, CICTERRA CONICET UNC, Av Velez Sarsfield 1699,X5016GCA, Cordoba, Argentina
来源：
COMPTES RENDUS PALEVOL | 2021年 / 20卷 / 35期
关键词：
Conodont biofacies; sea-level changes; La Silla Formation; San Juan Formation; Ordovician; Argentine Precordillera; YANGTZE PLATFORM; BIOSTRATIGRAPHY; SUCCESSION; SECTION;
D O I：
10.5852/cr-palevol2021v20a35
中图分类号：
Q91 [古生物学];
学科分类号：
0709 ; 070903 ;
摘要：
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).
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页码：741 / 759
页数：19
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