The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia

ABSTRACT Previous work has shown that Devonian magmatism in the southern Andes occurred in two contemporaneous belts: one emplaced in the continental crust of the North Patagonian Massif and the other in an oceanic island arc terrane to the west, Chaitenia, which was later accreted to Patagonia. The...

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Autores principales:	Hervé,Francisco, Calderón,Mauricio, Fanning,C. Mark, Pankhurst,Robert J., Rapela,Carlos W., Quezada,Paulo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2018
Materias:	Devonian Metamorphic complexes U-Pb zircon ages North Patagonian Massif Chaitenia
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300301
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spelling	oai:scielo:S0718-710620180003003012018-11-05The country rocks of Devonian magmatism in the North Patagonian Massif and ChaiteniaHervé,FranciscoCalderón,MauricioFanning,C. MarkPankhurst,Robert J.Rapela,Carlos W.Quezada,Paulo Devonian Metamorphic complexes U-Pb zircon ages North Patagonian Massif Chaitenia ABSTRACT Previous work has shown that Devonian magmatism in the southern Andes occurred in two contemporaneous belts: one emplaced in the continental crust of the North Patagonian Massif and the other in an oceanic island arc terrane to the west, Chaitenia, which was later accreted to Patagonia. The country rocks of the plutonic rocks consist of metasedimentary complexes which crop out sporadically in the Andes on both sides of the Argentina-Chile border, and additionally of pillow metabasalts for Chaitenia. Detrital zircon SHRIMP U-Pb age determinations in 13 samples of these rocks indicate maximum possible depositional ages from ca. 370 to 900 Ma, and the case is argued for mostly Devonian sedimentation as for the fossiliferous Buill slates. Ordovician, Cambrian-late Neoproterozoic and “Grenville-age” provenance is seen throughout, except for the most westerly outcrops where Devonian detrital zircons predominate. Besides a difference in the Precambrian zircon grains, 76% versus 25% respectively, there is no systematic variation in provenance from the Patagonian foreland to Chaitenia, so that the island arc terrane must have been proximal to the continent: its deeper crust is not exposed but several outcrops of ultramafic rocks are known. Zircons with devonian metamorphic rims in rocks from the North Patagonian Massif have no counterpart in the low metamorphic grade Chilean rocks. These Paleozoic metasedimentary rocks were also intruded by Pennsylvanian and Jurassic granitoids.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.45 n.3 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300301en10.5027/andgeov45n3-3117
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Devonian Metamorphic complexes U-Pb zircon ages North Patagonian Massif Chaitenia
spellingShingle	Devonian Metamorphic complexes U-Pb zircon ages North Patagonian Massif Chaitenia Hervé,Francisco Calderón,Mauricio Fanning,C. Mark Pankhurst,Robert J. Rapela,Carlos W. Quezada,Paulo The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia
description	ABSTRACT Previous work has shown that Devonian magmatism in the southern Andes occurred in two contemporaneous belts: one emplaced in the continental crust of the North Patagonian Massif and the other in an oceanic island arc terrane to the west, Chaitenia, which was later accreted to Patagonia. The country rocks of the plutonic rocks consist of metasedimentary complexes which crop out sporadically in the Andes on both sides of the Argentina-Chile border, and additionally of pillow metabasalts for Chaitenia. Detrital zircon SHRIMP U-Pb age determinations in 13 samples of these rocks indicate maximum possible depositional ages from ca. 370 to 900 Ma, and the case is argued for mostly Devonian sedimentation as for the fossiliferous Buill slates. Ordovician, Cambrian-late Neoproterozoic and “Grenville-age” provenance is seen throughout, except for the most westerly outcrops where Devonian detrital zircons predominate. Besides a difference in the Precambrian zircon grains, 76% versus 25% respectively, there is no systematic variation in provenance from the Patagonian foreland to Chaitenia, so that the island arc terrane must have been proximal to the continent: its deeper crust is not exposed but several outcrops of ultramafic rocks are known. Zircons with devonian metamorphic rims in rocks from the North Patagonian Massif have no counterpart in the low metamorphic grade Chilean rocks. These Paleozoic metasedimentary rocks were also intruded by Pennsylvanian and Jurassic granitoids.
author	Hervé,Francisco Calderón,Mauricio Fanning,C. Mark Pankhurst,Robert J. Rapela,Carlos W. Quezada,Paulo
author_facet	Hervé,Francisco Calderón,Mauricio Fanning,C. Mark Pankhurst,Robert J. Rapela,Carlos W. Quezada,Paulo
author_sort	Hervé,Francisco
title	The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia
title_short	The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia
title_full	The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia
title_fullStr	The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia
title_full_unstemmed	The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia
title_sort	country rocks of devonian magmatism in the north patagonian massif and chaitenia
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300301
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The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia

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