New insights on Lower Ordovician (Floian) reefs from the Argentine Precordillera: Biostratigraphic, sedimentologic and paleogeographic implications

Mestre, Ana; Heredia, Susana; Moreno, Florencia; Benegas, Leandro; Morfil, Andres; Soria, Tatiana

doi:10.1016/j.jsames.2020.102801

Cited by 3 publications

(1 citation statement)

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“…The paleolatitudinal position of Precordillera was probably tropical to subtropical (low-latitude) until the latest Dapingian-earliest Darriwilian, due to the presence of the Zondarella-dominated reefs in the upper part of the San Juan Formation at the Eastern Precordillera (Lehnert and Keller, 1993;Mestre et al, 2020). However, the youngest strata over this reef facies most likely were deposited on a carbonate and mixed platform in middle latitude as result of the collision of the Precordillera (Cuyania terrane) against to the western margin of Gondwana (Astini et al, 1995;Thomas and Astini, 1996;Thomas et al, 2000).…”

Section: Darriwilian Nuia Recordmentioning

confidence: 99%

Biostratigraphic and paleobiogeographic significance of the Darriwilian microfossils from the top of San Juan Formation in the Los Baños de Talacasto section, Central Precordillera (Argentina)

Mestre

Gallardo

Salas

et al. 2022

andgeo

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The microfossil hosted in the strata of the upper part of the San Juan Formation has been widely studied in several sections to the northward of the Argentinian Central Precordillera. In contrast, the coeval strata at the Los Baños de Talacasto section, in the southern part of the Central Precordillera, have scarce biostratigraphic and sedimentological data. In this work, a conodont association together with single ostracod species are documented for the first time in this section. The record of the Lenodus crassus and L. pseudoplanus zones confirms the Darriwilian age for these beds and accurately correlates them with equivalent strata of the San Juan Formation studied in several sections of the Central and Eastern Precordillera. The microfacies analysis verifies the presence of Nuia síbirica Maslov, 1954, peloids, intraclasts, cyanobacteria, calcareous algae, and a possible microbialite indicating a shallow warm-water subtidal environment, in equatorial to subequatorial climate. This suggests a low latitudes position for Precordillera during the early-middle Darriwilian. The conodont genus Aurilobodus Xiang and Zhang is recognized for the first time from the Precordillera, and the Aurilobodus leptosomatus An specimens are described and illustrated. This genus shows affinities to the warm water in shallow marine environments of North China, Central Asia, South Tibet, western Thailand, Australia, and Newfoundland, suggesting probable ties between Precordillera and these regions. The record of the ostracod Pilla nodospinosa Salas in the study section would agree with the correlation of the top of San Juan Formation with the lower levels of the Las Aguaditas Formation in the Central Precordillera, and also suggests paleobiogeographic links with Eastern Gondwana and Australia regions during the Darriwilian times.

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Section: Darriwilian Nuia Recordmentioning

confidence: 99%

Biostratigraphic and paleobiogeographic significance of the Darriwilian microfossils from the top of San Juan Formation in the Los Baños de Talacasto section, Central Precordillera (Argentina)

Mestre

Gallardo

Salas

et al. 2022

andgeo

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The Ordovician of southern South America

Waisfeld

Benedetto

Toro

et al. 2023

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Early Paleozoic rocks are widespread, superbly exposed, and reach several thousand metres thick in southern South America. A largely quadripartite geotectonic subdivision of this huge area encompasses: (1) intracratonic basins forming the sedimentary cover of the Amazonian craton (Brazilian collage), 2) clastic platform surrounding the Amazonian craton and the Pampia Terrane (Sierras Subandinas and Cordillera Oriental), (3) subduction-related parautochthonous volcanic arcs and associated volcano-sedimentary basins (Puna-Famatina arc), and (4) crustal fragments accreted to the proto-Andean margin of Gondwana (e.g. Cuyania Terrane). In this context, disparity in geodynamic histories, preserved record, and geological knowledge is remarkable.. Biostratigraphical frameworks allow the recognition of global chronostratigraphical Ordovician subdivisions with fairly good resolution in the Early and Middle Ordovician of the Precordillera and the Early Ordovician of the Cordillera Oriental of Argentina. In Sierras Subandinas and Cordillera Oriental of Bolivia the Ordovician statigraphy is almost complete, though these extensive regions are still poorly known. As well, trilobite-rich assemblages from the Cordillera Oriental and brachiopod-rich ones from Precordillera and Famatina offer a remarkable template for dissecting regionally different scenarios underlying Ordovician diversifications.. Overall, a more complete knowledge of this key area of Gondwana will certainly enhance our understanding of the global dynamics during the Ordovician.

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