87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)

87Sr/86Sr analysis on calcitic shells of pectinids (Chlamys actinodes and Chesapecten crassus) and oysters (Ostrea sp.) shows that the 'Entrerriense' sequence belonging to the Puerto Madryn Formation, Valdés Península (Chubut), was deposited at about 10.0 ± 0.3 Ma. Thus, a middle Tortonian...

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Detalles Bibliográficos
Autores principales:	Scasso, Roberto Adrian, Del Río, Claudia, Martínez Chiappara, Sergio Agustín
Publicado:	2001
Materias:	Cool water carbonates Coquinas Entrerriense Late miocene Patagonia; 87S./86Sr argon-argon dating geochronology Miocene Argentina
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v14_n3_p319_Scasso http://hdl.handle.net/20.500.12110/paper_08959811_v14_n3_p319_Scasso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08959811_v14_n3_p319_Scasso
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spelling	paper:paper_08959811_v14_n3_p319_Scasso2023-06-08T15:48:10Z 87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina) Scasso, Roberto Adrian Del Río, Claudia Martínez Chiappara, Sergio Agustín Cool water carbonates Coquinas Entrerriense Late miocene Patagonia; 87S./86Sr argon-argon dating geochronology Miocene Argentina 87Sr/86Sr analysis on calcitic shells of pectinids (Chlamys actinodes and Chesapecten crassus) and oysters (Ostrea sp.) shows that the 'Entrerriense' sequence belonging to the Puerto Madryn Formation, Valdés Península (Chubut), was deposited at about 10.0 ± 0.3 Ma. Thus, a middle Tortonian age is assigned to the sequence. Within the sequence, the pectinids better retain their original 87Sr/86Sr ratio, whilst the oysters are altered and yield older-than-real ages. The latter is the result of greater susceptibility to interaction with diagenetic fluids bearing Sr derived from the alteration of tuffaceous materials and volcanic rocks of intermediate and basic composition. © 2001 Elsevier Science Ltd. All rights reserved. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Del Río, C.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martínez, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v14_n3_p319_Scasso http://hdl.handle.net/20.500.12110/paper_08959811_v14_n3_p319_Scasso
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cool water carbonates Coquinas Entrerriense Late miocene Patagonia; 87S./86Sr argon-argon dating geochronology Miocene Argentina
spellingShingle	Cool water carbonates Coquinas Entrerriense Late miocene Patagonia; 87S./86Sr argon-argon dating geochronology Miocene Argentina Scasso, Roberto Adrian Del Río, Claudia Martínez Chiappara, Sergio Agustín 87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)
topic_facet	Cool water carbonates Coquinas Entrerriense Late miocene Patagonia; 87S./86Sr argon-argon dating geochronology Miocene Argentina
description	87Sr/86Sr analysis on calcitic shells of pectinids (Chlamys actinodes and Chesapecten crassus) and oysters (Ostrea sp.) shows that the 'Entrerriense' sequence belonging to the Puerto Madryn Formation, Valdés Península (Chubut), was deposited at about 10.0 ± 0.3 Ma. Thus, a middle Tortonian age is assigned to the sequence. Within the sequence, the pectinids better retain their original 87Sr/86Sr ratio, whilst the oysters are altered and yield older-than-real ages. The latter is the result of greater susceptibility to interaction with diagenetic fluids bearing Sr derived from the alteration of tuffaceous materials and volcanic rocks of intermediate and basic composition. © 2001 Elsevier Science Ltd. All rights reserved.
author	Scasso, Roberto Adrian Del Río, Claudia Martínez Chiappara, Sergio Agustín
author_facet	Scasso, Roberto Adrian Del Río, Claudia Martínez Chiappara, Sergio Agustín
author_sort	Scasso, Roberto Adrian
title	87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)
title_short	87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)
title_full	87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)
title_fullStr	87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)
title_full_unstemmed	87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)
title_sort	87sr/86sr late miocene age of fossil molluscs in the 'entrerriense' of the valdés peninsula (chubut, argentina)
publishDate	2001
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v14_n3_p319_Scasso http://hdl.handle.net/20.500.12110/paper_08959811_v14_n3_p319_Scasso
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87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina)

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