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Artículo

Evolution of the Jurassic Comallo volcanic sedimentary complex in the western North Patagonian Massif, Rio Negro province, Argentina

Barros, Mercedes VirginiaIcon ; Gregori, Daniel AlfredoIcon ; Benedini, LeonardoIcon ; Marcos, PauloIcon ; Strazzere, LeonardoIcon ; Pavon Pivetta, Cecilia MarianaIcon ; Geraldes, Mauro
Fecha de publicación: 24/02/2020
Editorial: Taylor & Francis
Revista: International Geology Review
ISSN: 0020-6814
e-ISSN: 1938-2839
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

Here we define the Comallo volcanic sedimentary complex of the western North Patagonian Massif. It is composed by two members that include 9 lithofacies and 7 facies associations. The lower member is represented by massive and stratified lapilli tuffs, lithic and tuffaceous breccias, coherent andesite-dacite lava-flows, andesitic breccias, and massive crystalline limestones. The upper member consists of red conglomerates, parallel and cross-stratification sandstones, and mudstones. The lower member is interpreted as having been deposited by dilute and dense pyroclastic currents, block and ash deposits and lava-flow, and hypersaline lacustrine environments. The upper member is considered to have been deposited in fluviatile environments. A new U-Pb age of 192.0 ± 3.0 Ma (Sinemurian) was obtained for this complex. It is coeval with several volcanic sedimentary units that crop out along the western North Patagonian Massif, the Neuquén basin and the Extraandean Chubut in pull-apart or rift depocentres. The movements of the NW-SE strike-slip faults that border the northern and southern limits of the Comallo depocentre made possible the development of a pull-apart basin as well as the volcanism and the fluvial system. This and other coeval units were deposited in similar environmental conditions along the North Patagonian Massif, the Neuquén basin and the extraandean Chubut, indicating a similar tectonomagmatic setting, in a tensional rear-arc during Lower Jurassic times.
Palabras clave: COMALLO , JURASSIC VOLCANISM , NORTH PATAGONIAN MASSIF , ARGENTINA
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)
Identificadores
URI: http://hdl.handle.net/11336/110472
URL: https://www.tandfonline.com/doi/full/10.1080/00206814.2020.1731854
DOI: http://dx.doi.org/10.1080/00206814.2020.1731854
Colecciones
Articulos(INGEOSUR)
Articulos de INST.GEOLOGICO DEL SUR
Citación
Barros, Mercedes Virginia; Gregori, Daniel Alfredo; Benedini, Leonardo; Marcos, Paulo; Strazzere, Leonardo; et al.; Evolution of the Jurassic Comallo volcanic sedimentary complex in the western North Patagonian Massif, Rio Negro province, Argentina; Taylor & Francis; International Geology Review; 24-2-2020; 1-23
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