A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance

The San Rafael Block is included as a part of the pre-Andean region, in the southern sector of the Argentine Precordillera–Cuyania terrane, within the western Gondwana margin. The Rı´o Seco de los Castan˜os Formation (Upper Silurian–Lower Devonian) is one of the major marine-siliciclastic pre-Carbon...

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Autores principales: Manassero, Marcelo Jorge, Cingolani, Carlos Alberto, Abre, P.
Formato: Libro Capitulo de libro
Lenguaje:Inglés
Publicado: The Geological Society 2009
Materias:
Geología
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/156751
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SEDICI (UNLP) de Universidad Nacional de La Plata
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spelling I19-R120-10915-1567512023-08-24T04:07:05Z http://sedici.unlp.edu.ar/handle/10915/156751 A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance Manassero, Marcelo Jorge Cingolani, Carlos Alberto Abre, P. 2009 2023-08-23T18:04:24Z The Geological Society en Geología The San Rafael Block is included as a part of the pre-Andean region, in the southern sector of the Argentine Precordillera–Cuyania terrane, within the western Gondwana margin. The Rı´o Seco de los Castan˜os Formation (Upper Silurian–Lower Devonian) is one of the major marine-siliciclastic pre-Carboniferous units, and is interpreted as a distal to proximal silty platform-deltaic system. The dominant sedimentary processes were wave and storm action and the source areas were located to the east, close to the study area. The rocks are mainly of immature arkosic sandstones showing both recycled orogen and continental block provenances. Sedimentological characteristics of conglomerate-filled channels and an organic-matter-rich bed are described. X-ray diffraction analyses of the clay minerals from the sequences show that very low-grade metamorphic conditions acted during the Early Carboniferous. Geochemical analyses indicate moderate to strong weathering, and potassium metasomatism. Zr/Sc ratios lower than 22, no important enrichments of Zr, Th/Sc ratios, high Sc and Cr concentration and the Eu-anomalies indicate a provenance from a less evolved upper continental crust. TDM ages and 1Nd are within the range of the Mesoproterozoic basement and Palaeozoic supracrustal rocks from the Precordillera–Cuyania terrane. Probable sources, tectonic setting and land–sea interactions are discussed. Centro de Investigaciones Geológicas Facultad de Ciencias Naturales y Museo Libro Capitulo de libro http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 215-240
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
spellingShingle Geología
Manassero, Marcelo Jorge
Cingolani, Carlos Alberto
Abre, P.
A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance
topic_facet Geología
description The San Rafael Block is included as a part of the pre-Andean region, in the southern sector of the Argentine Precordillera–Cuyania terrane, within the western Gondwana margin. The Rı´o Seco de los Castan˜os Formation (Upper Silurian–Lower Devonian) is one of the major marine-siliciclastic pre-Carboniferous units, and is interpreted as a distal to proximal silty platform-deltaic system. The dominant sedimentary processes were wave and storm action and the source areas were located to the east, close to the study area. The rocks are mainly of immature arkosic sandstones showing both recycled orogen and continental block provenances. Sedimentological characteristics of conglomerate-filled channels and an organic-matter-rich bed are described. X-ray diffraction analyses of the clay minerals from the sequences show that very low-grade metamorphic conditions acted during the Early Carboniferous. Geochemical analyses indicate moderate to strong weathering, and potassium metasomatism. Zr/Sc ratios lower than 22, no important enrichments of Zr, Th/Sc ratios, high Sc and Cr concentration and the Eu-anomalies indicate a provenance from a less evolved upper continental crust. TDM ages and 1Nd are within the range of the Mesoproterozoic basement and Palaeozoic supracrustal rocks from the Precordillera–Cuyania terrane. Probable sources, tectonic setting and land–sea interactions are discussed.
format Libro
Capitulo de libro
author Manassero, Marcelo Jorge
Cingolani, Carlos Alberto
Abre, P.
author_facet Manassero, Marcelo Jorge
Cingolani, Carlos Alberto
Abre, P.
author_sort Manassero, Marcelo Jorge
title A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance
title_short A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance
title_full A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance
title_fullStr A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance
title_full_unstemmed A Silurian-Devonian marine platform-deltaic system in the San Rafael Block, Argentine Precordillera-Cuyania terrane: lithofacies and provenance
title_sort silurian-devonian marine platform-deltaic system in the san rafael block, argentine precordillera-cuyania terrane: lithofacies and provenance
publisher The Geological Society
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/156751
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