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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Autores principales: Scasso, R.A., McArthur, J.M., Del Río, C.J., Martínez, S., Thirlwall, M.F.
Formato: JOUR
Materias:
Cool water carbonates
Coquinas
Entrerriense
Late miocene
Patagonia; 87S./86Sr
argon-argon dating
geochronology
Miocene
Argentina
Acceso en línea: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 todo:paper_08959811_v14_n3_p319_Scasso
record_format dspace
spelling todo:paper_08959811_v14_n3_p319_Scasso2023-10-03T15:42:31Z 87Sr/86Sr late miocene age of fossil molluscs in the 'entrerriense' of the Valdés Peninsula (Chubut, Argentina) Scasso, R.A. McArthur, J.M. Del Río, C.J. Martínez, S. Thirlwall, M.F. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, R.A.
McArthur, J.M.
Del Río, C.J.
Martínez, S.
Thirlwall, M.F.
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.
format JOUR
author Scasso, R.A.
McArthur, J.M.
Del Río, C.J.
Martínez, S.
Thirlwall, M.F.
author_facet Scasso, R.A.
McArthur, J.M.
Del Río, C.J.
Martínez, S.
Thirlwall, M.F.
author_sort Scasso, R.A.
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)
url http://hdl.handle.net/20.500.12110/paper_08959811_v14_n3_p319_Scasso
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