Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina

Sandstone petrography, geochemistry (major, trace, and rare earth elements [REE]), and Nd isotopic composition are presented for the siliciclastic Lower Caradoc Pavo´n Formation of the San Rafael block, central west Argentina. These constrain the provenance and tectonic setting of deposition and ena...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Cingolani, Carlos Alberto, Manassero, Marcelo Jorge, Abre, Paulina
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Geología
Gondwana margin
Sedimentary geochemistry
Siliciclastic rocks
Upper Ordovician
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/167136
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-167136
record_format dspace
spelling I19-R120-10915-1671362024-06-12T20:10:29Z http://sedici.unlp.edu.ar/handle/10915/167136 Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina Cingolani, Carlos Alberto Manassero, Marcelo Jorge Abre, Paulina 2003 2024-06-12T15:26:36Z en Geología Gondwana margin Sedimentary geochemistry Siliciclastic rocks Upper Ordovician Sandstone petrography, geochemistry (major, trace, and rare earth elements [REE]), and Nd isotopic composition are presented for the siliciclastic Lower Caradoc Pavo´n Formation of the San Rafael block, central west Argentina. These constrain the provenance and tectonic setting of deposition and enable comparison to equivalent Ordovician units along the proto-Andean Gondwana margin. Most of the Pavo´n Formation sandstones are quartz-feldspathic wackes, composed of quartz, feldspars, and fragments of metaquartzitic rocks. The samples plot in the recycled orogen and continental block provenance fields of QFL diagrams. In view of the intense recycling and diagenetic processes, as indicated by CIA and CIW indices, diagrams involving immobile trace elements are considered better source indicators and suggest an active margin and island continental arc provenance. REE element distributions and initial 1Nd isotopic values (23.1 to 24.0) provide evidence of upper crust source materials. Nd TDM model ages for the provenance protolith are 1.4–1.5 Ga, consistent with a possible sediment source in Grenville-age rocks exposed in the Ponon Trehue area. The Pavo´n Formation was part of the sedimentary infill of a foreland basin generated and uplifted following accretion of the Precordillera terrane with the Gondwana active margin. Centro de Investigaciones Geológicas Articulo Articulo 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 91-106
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Gondwana margin
Sedimentary geochemistry
Siliciclastic rocks
Upper Ordovician
spellingShingle Geología
Gondwana margin
Sedimentary geochemistry
Siliciclastic rocks
Upper Ordovician
Cingolani, Carlos Alberto
Manassero, Marcelo Jorge
Abre, Paulina
Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina
topic_facet Geología
Gondwana margin
Sedimentary geochemistry
Siliciclastic rocks
Upper Ordovician
description Sandstone petrography, geochemistry (major, trace, and rare earth elements [REE]), and Nd isotopic composition are presented for the siliciclastic Lower Caradoc Pavo´n Formation of the San Rafael block, central west Argentina. These constrain the provenance and tectonic setting of deposition and enable comparison to equivalent Ordovician units along the proto-Andean Gondwana margin. Most of the Pavo´n Formation sandstones are quartz-feldspathic wackes, composed of quartz, feldspars, and fragments of metaquartzitic rocks. The samples plot in the recycled orogen and continental block provenance fields of QFL diagrams. In view of the intense recycling and diagenetic processes, as indicated by CIA and CIW indices, diagrams involving immobile trace elements are considered better source indicators and suggest an active margin and island continental arc provenance. REE element distributions and initial 1Nd isotopic values (23.1 to 24.0) provide evidence of upper crust source materials. Nd TDM model ages for the provenance protolith are 1.4–1.5 Ga, consistent with a possible sediment source in Grenville-age rocks exposed in the Ponon Trehue area. The Pavo´n Formation was part of the sedimentary infill of a foreland basin generated and uplifted following accretion of the Precordillera terrane with the Gondwana active margin.
format Articulo
Articulo
author Cingolani, Carlos Alberto
Manassero, Marcelo Jorge
Abre, Paulina
author_facet Cingolani, Carlos Alberto
Manassero, Marcelo Jorge
Abre, Paulina
author_sort Cingolani, Carlos Alberto
title Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina
title_short Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina
title_full Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina
title_fullStr Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina
title_full_unstemmed Composition, provenance, and tectonic setting of Ordovician siliciclastic rocks in the San Rafael block: Southern extension of the Precordillera crustal fragment, Argentina
title_sort composition, provenance, and tectonic setting of ordovician siliciclastic rocks in the san rafael block: southern extension of the precordillera crustal fragment, argentina
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/167136
work_keys_str_mv AT cingolanicarlosalberto compositionprovenanceandtectonicsettingofordoviciansiliciclasticrocksinthesanrafaelblocksouthernextensionoftheprecordilleracrustalfragmentargentina
AT manasseromarcelojorge compositionprovenanceandtectonicsettingofordoviciansiliciclasticrocksinthesanrafaelblocksouthernextensionoftheprecordilleracrustalfragmentargentina
AT abrepaulina compositionprovenanceandtectonicsettingofordoviciansiliciclasticrocksinthesanrafaelblocksouthernextensionoftheprecordilleracrustalfragmentargentina
_version_ 1807223426986803200

Ejemplares similares