Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)

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In a preliminary attempt to establish an isotope stratigraphy, strontium, carbon and oxygen isotope ratios were determined from marine biogenic carbonates of Pliensbachian age, in the context of scheme of local ammonite Zones correlatable to the European Standard Zonation. Two sections, río Atuel an...

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Autores principales: Valencio, Susana Alicia, Cagnoni, M. C., Ramos A. M., Riccardi, Alberto Carlos, Panarello, Héctor Osvaldo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Ciencias Naturales
Chemostratigraphy
Ammonite Zonation
Bivalve shells
Pliensbachian
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/114019
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-114019
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Chemostratigraphy
Ammonite Zonation
Bivalve shells
Pliensbachian
spellingShingle Ciencias Naturales
Chemostratigraphy
Ammonite Zonation
Bivalve shells
Pliensbachian
Valencio, Susana Alicia
Cagnoni, M. C.
Ramos A. M.
Riccardi, Alberto Carlos
Panarello, Héctor Osvaldo
Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)
topic_facet Ciencias Naturales
Chemostratigraphy
Ammonite Zonation
Bivalve shells
Pliensbachian
description In a preliminary attempt to establish an isotope stratigraphy, strontium, carbon and oxygen isotope ratios were determined from marine biogenic carbonates of Pliensbachian age, in the context of scheme of local ammonite Zones correlatable to the European Standard Zonation. Two sections, río Atuel and arroyo Serrucho, of the mainly siliciclastic Puesto Araya Formation, Neuquén Basin, south-western Mendoza, Argentina, were studied. Specimens of the bivalve genera Weyla Bhöm and Gryphaea Lamarck were selected for the isotopic determinations because of their low-Mg calcite original mineralogy and widespread presence. Scanning electron microscopy, X-ray diffraction and X-ray fluorescence spectrometry techniques were used to control the good degree of preservation of most of the biogenic material, as evidenced by pristine fabrics, 100% calcite composition and Sr, Mn and Fe concentrations. Although strontium isotope ratios are slightly scattered, it is possible to compare them with those of the Early Jurassic seawater reference curve. Carbon isotope signals show two relative maxima, correlatable with those recorded for the upper part of the Ibex Zone and the middle part of the Margaritatus Zone in various European sections, indicating the possible global significance of these events. d18O values were found to be unreliable for isotope stratigraphy, as they are largely depleted in comparison to those of coeval unaltered marine carbonates.
format Articulo
Articulo
author Valencio, Susana Alicia
Cagnoni, M. C.
Ramos A. M.
Riccardi, Alberto Carlos
Panarello, Héctor Osvaldo
author_facet Valencio, Susana Alicia
Cagnoni, M. C.
Ramos A. M.
Riccardi, Alberto Carlos
Panarello, Héctor Osvaldo
author_sort Valencio, Susana Alicia
title Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)
title_short Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)
title_full Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)
title_fullStr Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)
title_full_unstemmed Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina)
title_sort chemostratigraphy of the pliensbachian, puesto araya formation (neuquén basin, argentina)
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/114019
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