First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile

Upper Cretaceous marine rocks crop out along the Pacific coast of central and south-central Chile between 33° and 37°S. These strata constitute an important reference for the Upper Cretaceous of South America due to their diverse fossil fauna and flora. The type unit of these deposits is the Quiriqu...

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Autores principales:	Encinas,Alfonso, Stinnesbeck,Wolfgang, Valencia,Víctor A
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Upper Cretaceous Quiriquina Formation Punta Topocalma Formation U-Pb Geochronology
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000200008
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spelling	oai:scielo:S0718-710620140002000082015-10-30First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central ChileEncinas,AlfonsoStinnesbeck,WolfgangValencia,Víctor A Upper Cretaceous Quiriquina Formation Punta Topocalma Formation U-Pb Geochronology Upper Cretaceous marine rocks crop out along the Pacific coast of central and south-central Chile between 33° and 37°S. These strata constitute an important reference for the Upper Cretaceous of South America due to their diverse fossil fauna and flora. The type unit of these deposits is the Quiriquina Formation, near Concepción. This unit is considered Maastrichtian in age based on ammonites. Upper Cretaceous marine strata from other localities of central and south-central Chile are largely unstudied and their biostratigraphic ages are not precisely known. We present the first radiometric dating (U-Pb on detrital zircons) for Upper Cretaceous marine strata of the Chilean forearc at Punta Topocalma that indicates a probable depositional age of 71.9+0.9 Ma (latest Campanian-earliest Maastrichtian). Provenance analysis indicates that the source of sediments of the Punta Topocalma Formation was plutonic and volcano-sedimentary rocks from the Coastal Cordillera and the Central Depression of central Chile. The Lo Valle Formation, a volcano-sedimentary unit in the Central Depression, recorded deposition of the Upper Cretaceous volcanic arc that was coeval with marine sedimentation in the Topocalma area.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.2 20142014-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000200008en10.5027/andgeoV41n2-a08
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Upper Cretaceous Quiriquina Formation Punta Topocalma Formation U-Pb Geochronology
spellingShingle	Upper Cretaceous Quiriquina Formation Punta Topocalma Formation U-Pb Geochronology Encinas,Alfonso Stinnesbeck,Wolfgang Valencia,Víctor A First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile
description	Upper Cretaceous marine rocks crop out along the Pacific coast of central and south-central Chile between 33° and 37°S. These strata constitute an important reference for the Upper Cretaceous of South America due to their diverse fossil fauna and flora. The type unit of these deposits is the Quiriquina Formation, near Concepción. This unit is considered Maastrichtian in age based on ammonites. Upper Cretaceous marine strata from other localities of central and south-central Chile are largely unstudied and their biostratigraphic ages are not precisely known. We present the first radiometric dating (U-Pb on detrital zircons) for Upper Cretaceous marine strata of the Chilean forearc at Punta Topocalma that indicates a probable depositional age of 71.9+0.9 Ma (latest Campanian-earliest Maastrichtian). Provenance analysis indicates that the source of sediments of the Punta Topocalma Formation was plutonic and volcano-sedimentary rocks from the Coastal Cordillera and the Central Depression of central Chile. The Lo Valle Formation, a volcano-sedimentary unit in the Central Depression, recorded deposition of the Upper Cretaceous volcanic arc that was coeval with marine sedimentation in the Topocalma area.
author	Encinas,Alfonso Stinnesbeck,Wolfgang Valencia,Víctor A
author_facet	Encinas,Alfonso Stinnesbeck,Wolfgang Valencia,Víctor A
author_sort	Encinas,Alfonso
title	First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile
title_short	First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile
title_full	First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile
title_fullStr	First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile
title_full_unstemmed	First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile
title_sort	first radiometric age (u-pb, la-icp-ms, on detrital zircons) from the punta topocalma formation: insights on late cretaceous marine deposition in central chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000200008
work_keys_str_mv	AT encinasalfonso firstradiometricageupblaicpmsondetritalzirconsfromthepuntatopocalmaformationinsightsonlatecretaceousmarinedepositionincentralchile AT stinnesbeckwolfgang firstradiometricageupblaicpmsondetritalzirconsfromthepuntatopocalmaformationinsightsonlatecretaceousmarinedepositionincentralchile AT valenciavictora firstradiometricageupblaicpmsondetritalzirconsfromthepuntatopocalmaformationinsightsonlatecretaceousmarinedepositionincentralchile
_version_	1714205846044409856

First radiometric age (U-Pb, LA-ICP-MS, on detrital zircons) from the Punta Topocalma Formation: insights on Late Cretaceous marine deposition in central Chile

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