Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)

ABSTRACT The Late Cretaceous Del Salto Pluton is one of the four Late Jurassic to Late Miocene intrusives that are recognized ca. 60 km inboard from the eastern limit of the Patagonian Batholith, close to the Chilean-Argentinian border. The pluton is a fluorite-bearing biotite syenogranite, except f...

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Autores principales:	Welkner,Daniela, Godoy,Estanislao, Bernhardt,Heinz-J.
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2002
Materias:	Alkalic mineral assemblage Patagonian Andes Post-collisional Cretaceous granites
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000100001
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spelling	oai:scielo:S0716-020820020001000012005-11-14Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)Welkner,DanielaGodoy,EstanislaoBernhardt,Heinz-J. Alkalic mineral assemblage Patagonian Andes Post-collisional Cretaceous granites ABSTRACT The Late Cretaceous Del Salto Pluton is one of the four Late Jurassic to Late Miocene intrusives that are recognized ca. 60 km inboard from the eastern limit of the Patagonian Batholith, close to the Chilean-Argentinian border. The pluton is a fluorite-bearing biotite syenogranite, except for part of its northeastern sector, where an alkali feldspar granite contains a typical peralkaline assemblage composed of relict augite and aegirine, together with arfvedsonite, ferrorichterite, astrophyllite, pyrochlore and zektzerite. Most of these minerals had not been recognized previously, making this the first example of an alkaline intrusion with a local peralkaline facies in this southern part of the continent. These mineral assemblages are unusual for a subduction-related margin in which subalkalic magmatism is characteristic. Judging from its trace element composition and rare earth element patterns, the pluton probably reflects the end product of extreme fractionation in a within-plate to post-collisional environment. The lack of clear-cut contacts between the rock that contains the peralkaline assemblage and the biotite syenogranite argues in favor of podiform bodies in which F-rich solutions have induced alkalic metasomatisminfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.29 n.1 20022002-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000100001en10.4067/S0716-02082002000100001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Alkalic mineral assemblage Patagonian Andes Post-collisional Cretaceous granites
spellingShingle	Alkalic mineral assemblage Patagonian Andes Post-collisional Cretaceous granites Welkner,Daniela Godoy,Estanislao Bernhardt,Heinz-J. Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)
description	ABSTRACT The Late Cretaceous Del Salto Pluton is one of the four Late Jurassic to Late Miocene intrusives that are recognized ca. 60 km inboard from the eastern limit of the Patagonian Batholith, close to the Chilean-Argentinian border. The pluton is a fluorite-bearing biotite syenogranite, except for part of its northeastern sector, where an alkali feldspar granite contains a typical peralkaline assemblage composed of relict augite and aegirine, together with arfvedsonite, ferrorichterite, astrophyllite, pyrochlore and zektzerite. Most of these minerals had not been recognized previously, making this the first example of an alkaline intrusion with a local peralkaline facies in this southern part of the continent. These mineral assemblages are unusual for a subduction-related margin in which subalkalic magmatism is characteristic. Judging from its trace element composition and rare earth element patterns, the pluton probably reflects the end product of extreme fractionation in a within-plate to post-collisional environment. The lack of clear-cut contacts between the rock that contains the peralkaline assemblage and the biotite syenogranite argues in favor of podiform bodies in which F-rich solutions have induced alkalic metasomatism
author	Welkner,Daniela Godoy,Estanislao Bernhardt,Heinz-J.
author_facet	Welkner,Daniela Godoy,Estanislao Bernhardt,Heinz-J.
author_sort	Welkner,Daniela
title	Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)
title_short	Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)
title_full	Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)
title_fullStr	Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)
title_full_unstemmed	Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)
title_sort	peralkaline rocks in the late cretaceous del salto pluton, eastern patagonian andes, aisén, chile (47°35's)
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000100001
work_keys_str_mv	AT welknerdaniela peralkalinerocksinthelatecretaceousdelsaltoplutoneasternpatagonianandesaisenchile4735s AT godoyestanislao peralkalinerocksinthelatecretaceousdelsaltoplutoneasternpatagonianandesaisenchile4735s AT bernhardtheinzj peralkalinerocksinthelatecretaceousdelsaltoplutoneasternpatagonianandesaisenchile4735s
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Peralkaline rocks in the Late Cretaceous Del Salto Pluton, Eastern Patagonian Andes, Aisén, Chile (47°35'S)

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