a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif

The age of the granites of the La Esperanza region of the Somuncura Batholith, North Patagonian Massif has been revised, based in part on RbSr whole-rock data obtained by reanalyzing samples from a previous study. The new ages are 258 ± 15 Ma for the Prieto Granodiorite and 259 ± 16 Ma for the Donos...

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Detalles Bibliográficos
Autores principales:	Caminos, Roberto Luis, Llambías, Eduardo Jorge, Parica, Claudio A.
Publicado:	1992
Materias:	Gondwana granite Permian rifting rubidium/strontium dating Triassic South America, North Patagonia, Somuncura
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v5_n3-4_p321_Pankhurst http://hdl.handle.net/20.500.12110/paper_08959811_v5_n3-4_p321_Pankhurst
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08959811_v5_n3-4_p321_Pankhurst
record_format	dspace
spelling	paper:paper_08959811_v5_n3-4_p321_Pankhurst2023-06-08T15:48:47Z a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif Caminos, Roberto Luis Llambías, Eduardo Jorge Parica, Claudio A. Gondwana granite Permian rifting rubidium/strontium dating Triassic South America, North Patagonia, Somuncura The age of the granites of the La Esperanza region of the Somuncura Batholith, North Patagonian Massif has been revised, based in part on RbSr whole-rock data obtained by reanalyzing samples from a previous study. The new ages are 258 ± 15 Ma for the Prieto Granodiorite and 259 ± 16 Ma for the Donosa Granite, both from the older La Esperanza plutonic complex, and 239 ± 4 Ma for the Calvo Granite, from the younger volcano-plutonic Dos Lomas complex. The initial 87Sr/86Sr ratios are all in the range 0.7070-0.7076. The ages probably correspond stratigraphically to Late Permian and Early Triassic for the two complexes, respectively, consistent with traditional geologic interpretation. Together with recently published Triassic ages from the Batholith of Central Patagonia, it is clear that the acidic volcano-plutonic associations of northern Patagonia are very latest Paleozoic and Mesozoic in age. They are not obviously related to terrane collision but are part of a Permo-Triassic acid magmatic province that extends throughout the central Andes and that preceded, or was associated with, the early rifting of Gondwana. © 1982. Fil:Caminos, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Llambias, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Parica, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1992 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v5_n3-4_p321_Pankhurst http://hdl.handle.net/20.500.12110/paper_08959811_v5_n3-4_p321_Pankhurst
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Gondwana granite Permian rifting rubidium/strontium dating Triassic South America, North Patagonia, Somuncura
spellingShingle	Gondwana granite Permian rifting rubidium/strontium dating Triassic South America, North Patagonia, Somuncura Caminos, Roberto Luis Llambías, Eduardo Jorge Parica, Claudio A. a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
topic_facet	Gondwana granite Permian rifting rubidium/strontium dating Triassic South America, North Patagonia, Somuncura
description	The age of the granites of the La Esperanza region of the Somuncura Batholith, North Patagonian Massif has been revised, based in part on RbSr whole-rock data obtained by reanalyzing samples from a previous study. The new ages are 258 ± 15 Ma for the Prieto Granodiorite and 259 ± 16 Ma for the Donosa Granite, both from the older La Esperanza plutonic complex, and 239 ± 4 Ma for the Calvo Granite, from the younger volcano-plutonic Dos Lomas complex. The initial 87Sr/86Sr ratios are all in the range 0.7070-0.7076. The ages probably correspond stratigraphically to Late Permian and Early Triassic for the two complexes, respectively, consistent with traditional geologic interpretation. Together with recently published Triassic ages from the Batholith of Central Patagonia, it is clear that the acidic volcano-plutonic associations of northern Patagonia are very latest Paleozoic and Mesozoic in age. They are not obviously related to terrane collision but are part of a Permo-Triassic acid magmatic province that extends throughout the central Andes and that preceded, or was associated with, the early rifting of Gondwana. © 1982.
author	Caminos, Roberto Luis Llambías, Eduardo Jorge Parica, Claudio A.
author_facet	Caminos, Roberto Luis Llambías, Eduardo Jorge Parica, Claudio A.
author_sort	Caminos, Roberto Luis
title	a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
title_short	a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
title_full	a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
title_fullStr	a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
title_full_unstemmed	a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
title_sort	revised age for the granites of the central somuncura batholith, north patagonian massif
publishDate	1992
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v5_n3-4_p321_Pankhurst http://hdl.handle.net/20.500.12110/paper_08959811_v5_n3-4_p321_Pankhurst
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a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif

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