Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile

40Ar/39Ar age data (laser and furnace step heating) on plagioclase from Lower Cretaceous volcanic sequences from the Arqueros Formation in two sections of the Coastal Range at the latitude of La Serena (=29°S) have been obtained. Due to the partial alteration of plagioclase crystals, disturbed age s...

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Autores principales:	Morata,Diego, Féraud,Gilbert, Aguirre,Luis, Arancibia,Gloria, Belmar,Mauricio, Morales,Salvador, Carrillo,Javier
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2008
Materias:	40Ar/39Ar dating Plagioclase Lower Cretaceous Volcanism Coastal Range Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082008000100006
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spelling	oai:scielo:S0716-020820080001000062008-04-10Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), ChileMorata,DiegoFéraud,GilbertAguirre,LuisArancibia,GloriaBelmar,MauricioMorales,SalvadorCarrillo,Javier 40Ar/39Ar dating Plagioclase Lower Cretaceous Volcanism Coastal Range Chile 40Ar/39Ar age data (laser and furnace step heating) on plagioclase from Lower Cretaceous volcanic sequences from the Arqueros Formation in two sections of the Coastal Range at the latitude of La Serena (=29°S) have been obtained. Due to the partial alteration of plagioclase crystals, disturbed age spectra in the furnace experiments have been observed, whereas laser heating determinations involving a much smaller quantity of grains carefully selected, could display plateau ages corresponding to pure plagioclase, as demonstrated by a constant 37Ar c¡/39ArK ratio. Plateau ages of 114.1±0.5 Ma (sample ARQ99-4), 111.3±0.9 Ma (sample TC99-5a), and 91.0±0.6 Ma (sample TC99-2) were found in lava flows, and 84.3±1.3 Ma on a dyke (sample ARQ99-7). These new 40Ar/39Ar ages, together with those previously published in central Chile, allow a constriction of the extensional magmatism during the Early Cretaceous in the Coastal Range of central and north-central Chile. All these data are in accordance with a long lived Early Cretaceous Magmatic Province (119-84 Ma), that could have started with a brief and huge magmatic event, mostly developed in the central part of the Coastal Range, followed by discrete magmatic pulses at further northern latitudesinfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.35 n.1 20082008-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082008000100006en10.4067/S0716-02082008000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	40Ar/39Ar dating Plagioclase Lower Cretaceous Volcanism Coastal Range Chile
spellingShingle	40Ar/39Ar dating Plagioclase Lower Cretaceous Volcanism Coastal Range Chile Morata,Diego Féraud,Gilbert Aguirre,Luis Arancibia,Gloria Belmar,Mauricio Morales,Salvador Carrillo,Javier Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile
description	40Ar/39Ar age data (laser and furnace step heating) on plagioclase from Lower Cretaceous volcanic sequences from the Arqueros Formation in two sections of the Coastal Range at the latitude of La Serena (=29°S) have been obtained. Due to the partial alteration of plagioclase crystals, disturbed age spectra in the furnace experiments have been observed, whereas laser heating determinations involving a much smaller quantity of grains carefully selected, could display plateau ages corresponding to pure plagioclase, as demonstrated by a constant 37Ar c¡/39ArK ratio. Plateau ages of 114.1±0.5 Ma (sample ARQ99-4), 111.3±0.9 Ma (sample TC99-5a), and 91.0±0.6 Ma (sample TC99-2) were found in lava flows, and 84.3±1.3 Ma on a dyke (sample ARQ99-7). These new 40Ar/39Ar ages, together with those previously published in central Chile, allow a constriction of the extensional magmatism during the Early Cretaceous in the Coastal Range of central and north-central Chile. All these data are in accordance with a long lived Early Cretaceous Magmatic Province (119-84 Ma), that could have started with a brief and huge magmatic event, mostly developed in the central part of the Coastal Range, followed by discrete magmatic pulses at further northern latitudes
author	Morata,Diego Féraud,Gilbert Aguirre,Luis Arancibia,Gloria Belmar,Mauricio Morales,Salvador Carrillo,Javier
author_facet	Morata,Diego Féraud,Gilbert Aguirre,Luis Arancibia,Gloria Belmar,Mauricio Morales,Salvador Carrillo,Javier
author_sort	Morata,Diego
title	Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile
title_short	Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile
title_full	Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile
title_fullStr	Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile
title_full_unstemmed	Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile
title_sort	geochronology of the lower cretaceous volcanism from the coastal range (29°20'-30°s), chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082008000100006
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Geochronology of the Lower Cretaceous volcanism from the Coastal Range (29°20'-30°S), Chile

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