Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up
During the Early Cretaceous important changes occurred in South-western Gondwana related to its fragmentation, and South Atlantic Ocean opening. Then, two basins developed in southernmost Patagonia: the Austral-Magallanes Basin and the Rocas Verdes-Magallanes Basin. The Río Mayer Formation correspon...
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ftconicet:oai:ri.conicet.gov.ar:11336/101494 2023-10-09T21:55:57+02:00 Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up Richiano, Sebastián Miguel Gómez Peral, Lucia Varela, Augusto Nicolás Gómez Dacal, Alejandro Rubén Cavarozzi, Claudia Ernestina Poire, Daniel Gustavo application/pdf http://hdl.handle.net/11336/101494 eng eng Pergamon-Elsevier Science Ltd info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0895981118304565 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2019.04.009 http://hdl.handle.net/11336/101494 Richiano, Sebastián Miguel; Gómez Peral, Lucia; Varela, Augusto Nicolás; Gómez Dacal, Alejandro Rubén; Cavarozzi, Claudia Ernestina; et al.; Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 93; 8-2019; 67-83 0895-9811 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ BLACK SHALES GEOCHEMISTRY LOWER CRETACEOUS PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.jsames.2019.04.009 2023-09-24T18:31:18Z During the Early Cretaceous important changes occurred in South-western Gondwana related to its fragmentation, and South Atlantic Ocean opening. Then, two basins developed in southernmost Patagonia: the Austral-Magallanes Basin and the Rocas Verdes-Magallanes Basin. The Río Mayer Formation corresponds to the initial sedimentary stages of the Austral Basin including black shales, marls and fine-grained sandstones deposited in an outer shelf environment. We studied and sampled three detailed sedimentary logs at Río Guanaco Locality (S 49° 57′ 11?; W 72° 04′ 56″), dividing this unit into three informal sections (lower, middle and upper). Whole rock geochemical analyses were carried out over the three sections with the focus on trace elements, in particular, rare earth elements (REE). While, the lower section of the unit shows an affinity to acid volcanic source areas, the middle and upper sections show an affinity to intermediate source areas. These changes through the Río Mayer Formation can be correlated with the initial magmatic activity hosted in the Southern Patagonian Batholith during the Neocomian. Considering the REE patterns, the lower section of the Río Mayer Formation shows an affinity to the felsic compositions of the Tobífera Formation, while the upper section would be related to the erosion of the Punta Barrosa/Cerro Toro formations of the Rocas Verdes-Magallanes Basin. The clear distinction between the REE patterns of the Río Mayer and Zapata formations is considered evidence of the compartmentalization of these basins during the Early Cretaceous. Finally, the absence of correlation between the geochemistry of the studied unit and the Jurassic volcanic rocks of the Deseado Massif indicates that the north-eastern sector of the basin was not a source area for the Austral Basin, at least during the deposition of the Río Mayer Formation in the study area. Fil: Richiano, Sebastián Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional ... Article in Journal/Newspaper South Atlantic Ocean CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Austral Patagonia Argentina Magallanes ENVELOPE(-62.933,-62.933,-64.883,-64.883) Rocas ENVELOPE(-56.948,-56.948,-63.398,-63.398) Journal of South American Earth Sciences 93 67 83 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
BLACK SHALES GEOCHEMISTRY LOWER CRETACEOUS PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
BLACK SHALES GEOCHEMISTRY LOWER CRETACEOUS PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Richiano, Sebastián Miguel Gómez Peral, Lucia Varela, Augusto Nicolás Gómez Dacal, Alejandro Rubén Cavarozzi, Claudia Ernestina Poire, Daniel Gustavo Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up |
topic_facet |
BLACK SHALES GEOCHEMISTRY LOWER CRETACEOUS PATAGONIA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
During the Early Cretaceous important changes occurred in South-western Gondwana related to its fragmentation, and South Atlantic Ocean opening. Then, two basins developed in southernmost Patagonia: the Austral-Magallanes Basin and the Rocas Verdes-Magallanes Basin. The Río Mayer Formation corresponds to the initial sedimentary stages of the Austral Basin including black shales, marls and fine-grained sandstones deposited in an outer shelf environment. We studied and sampled three detailed sedimentary logs at Río Guanaco Locality (S 49° 57′ 11?; W 72° 04′ 56″), dividing this unit into three informal sections (lower, middle and upper). Whole rock geochemical analyses were carried out over the three sections with the focus on trace elements, in particular, rare earth elements (REE). While, the lower section of the unit shows an affinity to acid volcanic source areas, the middle and upper sections show an affinity to intermediate source areas. These changes through the Río Mayer Formation can be correlated with the initial magmatic activity hosted in the Southern Patagonian Batholith during the Neocomian. Considering the REE patterns, the lower section of the Río Mayer Formation shows an affinity to the felsic compositions of the Tobífera Formation, while the upper section would be related to the erosion of the Punta Barrosa/Cerro Toro formations of the Rocas Verdes-Magallanes Basin. The clear distinction between the REE patterns of the Río Mayer and Zapata formations is considered evidence of the compartmentalization of these basins during the Early Cretaceous. Finally, the absence of correlation between the geochemistry of the studied unit and the Jurassic volcanic rocks of the Deseado Massif indicates that the north-eastern sector of the basin was not a source area for the Austral Basin, at least during the deposition of the Río Mayer Formation in the study area. Fil: Richiano, Sebastián Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional ... |
format |
Article in Journal/Newspaper |
author |
Richiano, Sebastián Miguel Gómez Peral, Lucia Varela, Augusto Nicolás Gómez Dacal, Alejandro Rubén Cavarozzi, Claudia Ernestina Poire, Daniel Gustavo |
author_facet |
Richiano, Sebastián Miguel Gómez Peral, Lucia Varela, Augusto Nicolás Gómez Dacal, Alejandro Rubén Cavarozzi, Claudia Ernestina Poire, Daniel Gustavo |
author_sort |
Richiano, Sebastián Miguel |
title |
Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up |
title_short |
Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up |
title_full |
Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up |
title_fullStr |
Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up |
title_full_unstemmed |
Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up |
title_sort |
geochemical characterization of black shales from the río mayer formation (early cretaceous), austral-magallanes basin, argentina: provenance response during gondwana break-up |
publisher |
Pergamon-Elsevier Science Ltd |
url |
http://hdl.handle.net/11336/101494 |
long_lat |
ENVELOPE(-62.933,-62.933,-64.883,-64.883) ENVELOPE(-56.948,-56.948,-63.398,-63.398) |
geographic |
Austral Patagonia Argentina Magallanes Rocas |
geographic_facet |
Austral Patagonia Argentina Magallanes Rocas |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0895981118304565 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2019.04.009 http://hdl.handle.net/11336/101494 Richiano, Sebastián Miguel; Gómez Peral, Lucia; Varela, Augusto Nicolás; Gómez Dacal, Alejandro Rubén; Cavarozzi, Claudia Ernestina; et al.; Geochemical characterization of black shales from the Río Mayer Formation (Early Cretaceous), Austral-Magallanes Basin, Argentina: Provenance response during Gondwana break-up; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 93; 8-2019; 67-83 0895-9811 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.jsames.2019.04.009 |
container_title |
Journal of South American Earth Sciences |
container_volume |
93 |
container_start_page |
67 |
op_container_end_page |
83 |
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1779320209147953152 |