U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile

The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and...

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Autores principales:	Deckart,Katja, Hervé,Francisco, Fanning,C. Mark, Ramírez,Valeria, Calderón,Mauricio, Godoy,Estanislao
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Coastal Batholith Pennsylvanian zircons U-Pb Lu-Hf and O isotope geochemistry
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100003
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spelling	oai:scielo:S0718-710620140001000032014-03-24U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central ChileDeckart,KatjaHervé,FranciscoFanning,C. MarkRamírez,ValeriaCalderón,MauricioGodoy,Estanislao Coastal Batholith Pennsylvanian zircons U-Pb Lu-Hf and O isotope geochemistry The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf(i) values from +1.67 to -5.64. The δ18O ratios for that grains range from 6.4 to 8.6%o. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.1 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100003en10.5027/andgeoV41n1-a03
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Coastal Batholith Pennsylvanian zircons U-Pb Lu-Hf and O isotope geochemistry
spellingShingle	Coastal Batholith Pennsylvanian zircons U-Pb Lu-Hf and O isotope geochemistry Deckart,Katja Hervé,Francisco Fanning,C. Mark Ramírez,Valeria Calderón,Mauricio Godoy,Estanislao U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
description	The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf(i) values from +1.67 to -5.64. The δ18O ratios for that grains range from 6.4 to 8.6%o. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.
author	Deckart,Katja Hervé,Francisco Fanning,C. Mark Ramírez,Valeria Calderón,Mauricio Godoy,Estanislao
author_facet	Deckart,Katja Hervé,Francisco Fanning,C. Mark Ramírez,Valeria Calderón,Mauricio Godoy,Estanislao
author_sort	Deckart,Katja
title	U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
title_short	U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
title_full	U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
title_fullStr	U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
title_full_unstemmed	U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
title_sort	u-pb geochronology and hf-o isotopes of zircons from the pennsylvanian coastal batholith, south-central chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100003
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U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile

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