Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input

The study of heavy minerals from the Caradocian Pavón Formation (central Argentina) suggests that MORB and continental intraplate flood basalts were among the source rocks for the detrital record. The Pavón Formation was deposited on the disputed exotic Precordillera terrane. Provenance studies on t...

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Autores principales: Abre, P., Cingolani, Carlos Alberto, Zimmermann, U., Cairncross, B.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Geología
Precordillera terrane
Detrital spinel
Heavy minerals
Provenance
Gondwana margin
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/156016
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-156016
record_format dspace
spelling I19-R120-10915-1560162023-08-08T04:06:36Z http://sedici.unlp.edu.ar/handle/10915/156016 Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input Abre, P. Cingolani, Carlos Alberto Zimmermann, U. Cairncross, B. 2009 2023-08-07T17:40:27Z en Geología Precordillera terrane Detrital spinel Heavy minerals Provenance Gondwana margin The study of heavy minerals from the Caradocian Pavón Formation (central Argentina) suggests that MORB and continental intraplate flood basalts were among the source rocks for the detrital record. The Pavón Formation was deposited on the disputed exotic Precordillera terrane. Provenance studies on this formation revealed sedimentary rocks characterized by an upper continental crustal component mixed with a mafic source, where the latter could not be described. The detrital chromian spinels provide more information about this component. The detrital spinels were chemically separated into two groups. Group 1 shows characteristics typical for host rocks related to MORB (Cr# values are between 0.4 and 0.6, Fe2+# range from 0.2 to 0.4, and they have low TiO2 and low Fe3+# contents). Conversely, Group 2 has Cr# of 0.7, Fe2+# ranging from 0.5 to 0.8, higher Fe3+# and TiO2 contents up to 4.7%, and they are related to continental flood basalts. The detrital spinels are chemically and texturally compared to those hosted in probable source rocks. Although the mafic source still remains unknown, the presence of detrital chromian spinels within the Pavón Formation implies the existence of an oceanic crustal component closely related to the Precordillera terrane. Centro de Investigaciones Geológicas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 407-418
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Precordillera terrane
Detrital spinel
Heavy minerals
Provenance
Gondwana margin
spellingShingle Geología
Precordillera terrane
Detrital spinel
Heavy minerals
Provenance
Gondwana margin
Abre, P.
Cingolani, Carlos Alberto
Zimmermann, U.
Cairncross, B.
Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input
topic_facet Geología
Precordillera terrane
Detrital spinel
Heavy minerals
Provenance
Gondwana margin
description The study of heavy minerals from the Caradocian Pavón Formation (central Argentina) suggests that MORB and continental intraplate flood basalts were among the source rocks for the detrital record. The Pavón Formation was deposited on the disputed exotic Precordillera terrane. Provenance studies on this formation revealed sedimentary rocks characterized by an upper continental crustal component mixed with a mafic source, where the latter could not be described. The detrital chromian spinels provide more information about this component. The detrital spinels were chemically separated into two groups. Group 1 shows characteristics typical for host rocks related to MORB (Cr# values are between 0.4 and 0.6, Fe2+# range from 0.2 to 0.4, and they have low TiO2 and low Fe3+# contents). Conversely, Group 2 has Cr# of 0.7, Fe2+# ranging from 0.5 to 0.8, higher Fe3+# and TiO2 contents up to 4.7%, and they are related to continental flood basalts. The detrital spinels are chemically and texturally compared to those hosted in probable source rocks. Although the mafic source still remains unknown, the presence of detrital chromian spinels within the Pavón Formation implies the existence of an oceanic crustal component closely related to the Precordillera terrane.
format Articulo
Articulo
author Abre, P.
Cingolani, Carlos Alberto
Zimmermann, U.
Cairncross, B.
author_facet Abre, P.
Cingolani, Carlos Alberto
Zimmermann, U.
Cairncross, B.
author_sort Abre, P.
title Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input
title_short Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input
title_full Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input
title_fullStr Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input
title_full_unstemmed Detrital chromian spinels from Upper Ordovician deposits in the Precordillera terrane, Argentina: A mafic crust input
title_sort detrital chromian spinels from upper ordovician deposits in the precordillera terrane, argentina: a mafic crust input
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/156016
work_keys_str_mv AT abrep detritalchromianspinelsfromupperordoviciandepositsintheprecordilleraterraneargentinaamaficcrustinput
AT cingolanicarlosalberto detritalchromianspinelsfromupperordoviciandepositsintheprecordilleraterraneargentinaamaficcrustinput
AT zimmermannu detritalchromianspinelsfromupperordoviciandepositsintheprecordilleraterraneargentinaamaficcrustinput
AT cairncrossb detritalchromianspinelsfromupperordoviciandepositsintheprecordilleraterraneargentinaamaficcrustinput
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