Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina

It is weil known that isotope stratigraphy is one of the most powerful tools in Upper Precambrian to Lower Paleozoic chronostratigraphy. The Sr isotope composition of seawater for this age interval is characterized by a contm. uous .mcrease 0f 87Sr/86Sr that I.S I. nterrupted, by sharp rises, which...

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Detalles Bibliográficos
Autores principales: Cingolani, Carlos Alberto, Kawashita, K., Naipauer, Maximiliano, Varela, Ricardo, Chemale Jr., F.
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2003
Materias:
Ciencias Naturales
Carbonate rocks
Sr isotopes
Pb-Pb dating
Precordillera Terrane
Neoproterozoic-Lower Paleozoic
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/164213
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-164213
record_format dspace
spelling I19-R120-10915-1642132024-03-25T20:09:06Z http://sedici.unlp.edu.ar/handle/10915/164213 Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina Cingolani, Carlos Alberto Kawashita, K. Naipauer, Maximiliano Varela, Ricardo Chemale Jr., F. 2003 2003 2024-03-25T18:10:39Z en Ciencias Naturales Carbonate rocks Sr isotopes Pb-Pb dating Precordillera Terrane Neoproterozoic-Lower Paleozoic It is weil known that isotope stratigraphy is one of the most powerful tools in Upper Precambrian to Lower Paleozoic chronostratigraphy. The Sr isotope composition of seawater for this age interval is characterized by a contm. uous .mcrease 0f 87Sr/86Sr that I.S I. nterrupted, by sharp rises, which represent important changes in the Earth history. During Late Cambrian to Early Ordovician LUlle the 87Sr/86Sr seawater ratio is high and close to the modern value of 0.70907 (Kaufman et al., 1993; Veizer et al., 1997; Jacobsen & Kaufman, 1999; Montafiez et al., 2000). The Pb-Pb isotopic dating technique have been refined and successfully applied to a variety of geological problems (Jahn & Cuvellier, 1994, Babinski et al., 1999). We examine in this paper carbonate sequences from the Precordillera or Cuyania Terrane that are located at the Salinas Hill and Pie de Palo Range (Fig. 1), as a part of the "Angaco Bel!" (Vujovich & Ramos, 1994). Also for comparison, we use two samples from the fossiliferous :.uwer to Middle Cambrian carbonates in the Eastern Precordillera (La Laja Fm.). We have studied their 87Sr/86Sr composition and compare it to global Sr isotope secular variation curves and we present new Pb-Pb isotope analyses on carbonate samples from Salinas Hill. The aims of the study were to constrain the timing of deposition/diagenesis and of subsequent metamorphisrn/ deforrnation of the carbonate levels from the Caucete Group. Centro de Investigaciones Geológicas Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 164-167
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Carbonate rocks
Sr isotopes
Pb-Pb dating
Precordillera Terrane
Neoproterozoic-Lower Paleozoic
spellingShingle Ciencias Naturales
Carbonate rocks
Sr isotopes
Pb-Pb dating
Precordillera Terrane
Neoproterozoic-Lower Paleozoic
Cingolani, Carlos Alberto
Kawashita, K.
Naipauer, Maximiliano
Varela, Ricardo
Chemale Jr., F.
Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina
topic_facet Ciencias Naturales
Carbonate rocks
Sr isotopes
Pb-Pb dating
Precordillera Terrane
Neoproterozoic-Lower Paleozoic
description It is weil known that isotope stratigraphy is one of the most powerful tools in Upper Precambrian to Lower Paleozoic chronostratigraphy. The Sr isotope composition of seawater for this age interval is characterized by a contm. uous .mcrease 0f 87Sr/86Sr that I.S I. nterrupted, by sharp rises, which represent important changes in the Earth history. During Late Cambrian to Early Ordovician LUlle the 87Sr/86Sr seawater ratio is high and close to the modern value of 0.70907 (Kaufman et al., 1993; Veizer et al., 1997; Jacobsen & Kaufman, 1999; Montafiez et al., 2000). The Pb-Pb isotopic dating technique have been refined and successfully applied to a variety of geological problems (Jahn & Cuvellier, 1994, Babinski et al., 1999). We examine in this paper carbonate sequences from the Precordillera or Cuyania Terrane that are located at the Salinas Hill and Pie de Palo Range (Fig. 1), as a part of the "Angaco Bel!" (Vujovich & Ramos, 1994). Also for comparison, we use two samples from the fossiliferous :.uwer to Middle Cambrian carbonates in the Eastern Precordillera (La Laja Fm.). We have studied their 87Sr/86Sr composition and compare it to global Sr isotope secular variation curves and we present new Pb-Pb isotope analyses on carbonate samples from Salinas Hill. The aims of the study were to constrain the timing of deposition/diagenesis and of subsequent metamorphisrn/ deforrnation of the carbonate levels from the Caucete Group.
format Objeto de conferencia
Objeto de conferencia
author Cingolani, Carlos Alberto
Kawashita, K.
Naipauer, Maximiliano
Varela, Ricardo
Chemale Jr., F.
author_facet Cingolani, Carlos Alberto
Kawashita, K.
Naipauer, Maximiliano
Varela, Ricardo
Chemale Jr., F.
author_sort Cingolani, Carlos Alberto
title Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina
title_short Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina
title_full Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina
title_fullStr Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina
title_full_unstemmed Sr isotopic composition and Pb-Pb age of Neoproterozoic-lower Paleozoic carbonate sequences at Salinas hill and Pie de Palo range, Western Argentina
title_sort sr isotopic composition and pb-pb age of neoproterozoic-lower paleozoic carbonate sequences at salinas hill and pie de palo range, western argentina
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/164213
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