Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)

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New data on some neopalaeozoic lithostratigraphic units of the central sector of the Argentinean Precordillera are presented. The western Precordillera displays occasional outcrops of siliciclastic rocks of the Late Palaeozoic. These rocks are separated by two main unconformities related to the deve...

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Autores principales: Colombo, Francisco, Limarino, Carlos Oscar, Spalletti, Luis Antonio, Busquets, P., Cardó, R., Méndez Bedia, I., Heredia, N.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Geología
Andes
Carboniferous
Chanic orogen
Gondwanan orogen
Lithostratigraphic units
Permian
Triassic
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85182
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85182
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Andes
Carboniferous
Chanic orogen
Gondwanan orogen
Lithostratigraphic units
Permian
Triassic
spellingShingle Geología
Andes
Carboniferous
Chanic orogen
Gondwanan orogen
Lithostratigraphic units
Permian
Triassic
Colombo, Francisco
Limarino, Carlos Oscar
Spalletti, Luis Antonio
Busquets, P.
Cardó, R.
Méndez Bedia, I.
Heredia, N.
Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)
topic_facet Geología
Andes
Carboniferous
Chanic orogen
Gondwanan orogen
Lithostratigraphic units
Permian
Triassic
description New data on some neopalaeozoic lithostratigraphic units of the central sector of the Argentinean Precordillera are presented. The western Precordillera displays occasional outcrops of siliciclastic rocks of the Late Palaeozoic. These rocks are separated by two main unconformities related to the development of the Chanic (Upper Devonian-early Carboniferous) and Gondwanan (late Carboniferous-early Permian) orogens. A major unconformity marks the beginning of the Andean cycle in middle Permian times. The Del Ratón Formation (800 m) in the studied area is made up of conglomerates and can be divided into two units. The basal part (Lower Member) was deposited in a fjord environment. The Upper Member was generated by an alluvial system that was mainly dominated by upper flow-regime plane beds, whereas its uppermost part accumulated in a fan delta setting. The clast provenance and the main palaeocurrents suggest the existence of a significant topographic high to the W and NW of the present outcrops. The El Planchón Formation (1400 m) is mainly composed of shales and sandstones as a result of sedimentation in a deep-sea fan environment. These lutite-dominated materials graded laterally northwards into conglomerates in a glacial setting. The Del Ratón and El Planchón formations of the Lower Carboniferous correspond to the synorogenic Chanic sedimentation (Chanic foreland basin). Thereafter, the stratigraphic succession underwent deformation which led to its prolonged subaerial exposure and rubefaction. In Permian times, a marine transgression gave rise to the Del Salto Formation (600 m), which is constituted by beach deposits with some aeolian reworking and which lies unconformably over the Lower Carboniferous rocks. Conglomerates (Quebrada del Alumbre Formation, 100 m) produced by an alluvial system prograded episodically into coastal areas. The Escombrera Formation (350 m) is composed of beach deposits prograding seawards. This formation probably represents the end of the Palaeozoic sedimentary record. Thereafter, a playa-lake and an alluvial fan system were generated (Quebrada de la Arena Formation). This unit (750 m) was the last infill of the Gondwanan retroarc foreland, the total thickness of which was about 4000 m.
format Articulo
Articulo
author Colombo, Francisco
Limarino, Carlos Oscar
Spalletti, Luis Antonio
Busquets, P.
Cardó, R.
Méndez Bedia, I.
Heredia, N.
author_facet Colombo, Francisco
Limarino, Carlos Oscar
Spalletti, Luis Antonio
Busquets, P.
Cardó, R.
Méndez Bedia, I.
Heredia, N.
author_sort Colombo, Francisco
title Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)
title_short Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)
title_full Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)
title_fullStr Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)
title_full_unstemmed Late Palaeozoic lithostratigraphy of the Andean Precordillera revisited (San Juan Province, Argentina)
title_sort late palaeozoic lithostratigraphy of the andean precordillera revisited (san juan province, argentina)
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85182
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