Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province

Magmatism related to the growth and migration of the Andean arc was developed from the 36°40'S to the 38°20'S latitude, in the northwestern sector of the Neuquén Province, by the end of the Mesozoic. Hypabyssal and extrusive facies, which outcrop in the Pichaihue area, were described based...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Mateo Fernández Caso, María Paula, Montero, Daniel G., Leal, Pablo Rodrigo, Ramos, Victor Alberto
Publicado:	2011
Materias:	Cayanta Colipilli Neuquén basin Tertiary magmatism andesite Cretaceous dike emplacement Eocene geochemistry island arc magmatism Mesozoic outcrop petrography petrology Tertiary trace element Andes Argentina Neuquen
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p173_MateoFerNandezCaso http://hdl.handle.net/20.500.12110/paper_00044822_v68_n2_p173_MateoFerNandezCaso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00044822_v68_n2_p173_MateoFerNandezCaso
record_format	dspace
spelling	paper:paper_00044822_v68_n2_p173_MateoFerNandezCaso2023-06-08T14:26:32Z Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province Mateo Fernández Caso, María Paula Montero, Daniel G. Leal, Pablo Rodrigo Ramos, Victor Alberto Cayanta Colipilli Neuquén basin Tertiary magmatism andesite Cretaceous dike emplacement Eocene geochemistry island arc magmatism Mesozoic outcrop petrography petrology Tertiary trace element Andes Argentina Neuquen Magmatism related to the growth and migration of the Andean arc was developed from the 36°40'S to the 38°20'S latitude, in the northwestern sector of the Neuquén Province, by the end of the Mesozoic. Hypabyssal and extrusive facies, which outcrop in the Pichaihue area, were described based on petrologic studies. The first ones are composed of andesites that are emplaced as lacoliths, dikes or sills intruding the Mesozoic sedimentary sequences. In addition, basalts outcrops were recognized. The extrusive facies consist of breccia or massive lavas and little domes. The geochemistry reveals an arc-like calc-alkaline signature with a normal crust and trace-element patterns which suggest a similar source. Based on regional knowledge, three groups are proposed: Cerro Mocho dikes with Ti anomalies and higher Sm/Yb; extrusive facies of the Upper Cretaceous- Paleocene (Rivera Andesite); and the hypabyssal facies of thr Eocene (Colipilli Dikes). Finally, the occurrences of these rocks in this segment of the Andes indicate an important shift to the East of the Upper Cretaceous-Eocene volcanic arc that reveals its easternmost position. Fil:Mateo FerNández Caso, P.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Montero, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Leal, P.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ramos, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p173_MateoFerNandezCaso http://hdl.handle.net/20.500.12110/paper_00044822_v68_n2_p173_MateoFerNandezCaso
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cayanta Colipilli Neuquén basin Tertiary magmatism andesite Cretaceous dike emplacement Eocene geochemistry island arc magmatism Mesozoic outcrop petrography petrology Tertiary trace element Andes Argentina Neuquen
spellingShingle	Cayanta Colipilli Neuquén basin Tertiary magmatism andesite Cretaceous dike emplacement Eocene geochemistry island arc magmatism Mesozoic outcrop petrography petrology Tertiary trace element Andes Argentina Neuquen Mateo Fernández Caso, María Paula Montero, Daniel G. Leal, Pablo Rodrigo Ramos, Victor Alberto Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
topic_facet	Cayanta Colipilli Neuquén basin Tertiary magmatism andesite Cretaceous dike emplacement Eocene geochemistry island arc magmatism Mesozoic outcrop petrography petrology Tertiary trace element Andes Argentina Neuquen
description	Magmatism related to the growth and migration of the Andean arc was developed from the 36°40'S to the 38°20'S latitude, in the northwestern sector of the Neuquén Province, by the end of the Mesozoic. Hypabyssal and extrusive facies, which outcrop in the Pichaihue area, were described based on petrologic studies. The first ones are composed of andesites that are emplaced as lacoliths, dikes or sills intruding the Mesozoic sedimentary sequences. In addition, basalts outcrops were recognized. The extrusive facies consist of breccia or massive lavas and little domes. The geochemistry reveals an arc-like calc-alkaline signature with a normal crust and trace-element patterns which suggest a similar source. Based on regional knowledge, three groups are proposed: Cerro Mocho dikes with Ti anomalies and higher Sm/Yb; extrusive facies of the Upper Cretaceous- Paleocene (Rivera Andesite); and the hypabyssal facies of thr Eocene (Colipilli Dikes). Finally, the occurrences of these rocks in this segment of the Andes indicate an important shift to the East of the Upper Cretaceous-Eocene volcanic arc that reveals its easternmost position.
author	Mateo Fernández Caso, María Paula Montero, Daniel G. Leal, Pablo Rodrigo Ramos, Victor Alberto
author_facet	Mateo Fernández Caso, María Paula Montero, Daniel G. Leal, Pablo Rodrigo Ramos, Victor Alberto
author_sort	Mateo Fernández Caso, María Paula
title	Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
title_short	Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
title_full	Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
title_fullStr	Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
title_full_unstemmed	Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
title_sort	petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v68_n2_p173_MateoFerNandezCaso http://hdl.handle.net/20.500.12110/paper_00044822_v68_n2_p173_MateoFerNandezCaso
work_keys_str_mv	AT mateofernandezcasomariapaula petrographyandgeochemistryofuppercretaceouseocenemagmatisminthepichaihueareaneuquenprovince AT monterodanielg petrographyandgeochemistryofuppercretaceouseocenemagmatisminthepichaihueareaneuquenprovince AT lealpablorodrigo petrographyandgeochemistryofuppercretaceouseocenemagmatisminthepichaihueareaneuquenprovince AT ramosvictoralberto petrographyandgeochemistryofuppercretaceouseocenemagmatisminthepichaihueareaneuquenprovince
_version_	1768543635605815296

Petrography and geochemistry of upper cretaceous-eocene magmatism in the pichaihue area, neuquén province

Ejemplares similares