Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.

Isotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study of strontium, oxygen and sulphur has been carried out in Ca-sulphate facies of Jurassic marine evaporites (Tábanos Formation and Auquilco Formation) outcropping in southern Mendoza, Aconcagua-...

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Detalhes bibliográficos
Autores: Lo Forte, G. L., Ortí Cabo, Federico, Rosell, Laura (Rosell i Ortiz)
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2005
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/16877
Acesso em linha:https://hdl.handle.net/2445/16877
Access Level:acceso abierto
Palavra-chave:Evaporites
Geologia isotòpica
Jurassic Period
Argentina
Isotope geology
Jurassic
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spelling Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.Lo Forte, G. L.Ortí Cabo, FedericoRosell, Laura (Rosell i Ortiz)EvaporitesGeologia isotòpicaJurassic PeriodArgentinaEvaporitesIsotope geologyJurassicArgentinaIsotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study of strontium, oxygen and sulphur has been carried out in Ca-sulphate facies of Jurassic marine evaporites (Tábanos Formation and Auquilco Formation) outcropping in southern Mendoza, Aconcagua-Neuquén Basin (Argentina), as a part of a comprehensive sedimentologic study. The analysed sections are located at arroyo Las Leñitas, Cañada Ancha and arroyo Blanco. Sampled units include laminated, banded, and nodular lithofacies, made up of anhydrite, secondary gypsum and calcite. The mineralogy was studied by conventional petrographic analysis and X-ray diffraction. The 87Sr/86Sr ratio was obtained in six samples, with values ranging from 0.706793 to 0.706839, which match marine calcium-sulphate data of the same age. A similar conclusion may be derived from ten samples analysed for oxygen (18O) and sulphur (34S) isotopic composition: the obtained values are between +11.55‰ and +14.42‰, and between +17.25‰ and +18.48‰ respectively. The sedimentologic-stratigraphic evidence and the isotopic data both suggest a marine origin for the Tábanos and Auquilco evaporites, without an analytically detectable contribution of continental waters or hydrothermal solutions. The results also suggest that no isotope fractionation occurred during the primary gypsum-to-anhydrite-to-secondary gypsum transformations.Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)2005info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/16877Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a http://doi.org/10.1344/105.000001404Geologica Acta, 2005, vol. 3, núm. 2, p. 155-161http://doi.org/10.1344/105.000001404cc by-sa (c) Lo Forte el al., 2005http://creativecommons.org/licenses/by-sa/3.0/es/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/168772026-05-27T06:46:51Z
dc.title.none.fl_str_mv Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
title Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
spellingShingle Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
Lo Forte, G. L.
Evaporites
Geologia isotòpica
Jurassic Period
Argentina
Evaporites
Isotope geology
Jurassic
Argentina
title_short Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
title_full Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
title_fullStr Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
title_full_unstemmed Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
title_sort Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina.
dc.creator.none.fl_str_mv Lo Forte, G. L.
Ortí Cabo, Federico
Rosell, Laura (Rosell i Ortiz)
author Lo Forte, G. L.
author_facet Lo Forte, G. L.
Ortí Cabo, Federico
Rosell, Laura (Rosell i Ortiz)
author_role author
author2 Ortí Cabo, Federico
Rosell, Laura (Rosell i Ortiz)
author2_role author
author
dc.subject.none.fl_str_mv Evaporites
Geologia isotòpica
Jurassic Period
Argentina
Evaporites
Isotope geology
Jurassic
Argentina
topic Evaporites
Geologia isotòpica
Jurassic Period
Argentina
Evaporites
Isotope geology
Jurassic
Argentina
description Isotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study of strontium, oxygen and sulphur has been carried out in Ca-sulphate facies of Jurassic marine evaporites (Tábanos Formation and Auquilco Formation) outcropping in southern Mendoza, Aconcagua-Neuquén Basin (Argentina), as a part of a comprehensive sedimentologic study. The analysed sections are located at arroyo Las Leñitas, Cañada Ancha and arroyo Blanco. Sampled units include laminated, banded, and nodular lithofacies, made up of anhydrite, secondary gypsum and calcite. The mineralogy was studied by conventional petrographic analysis and X-ray diffraction. The 87Sr/86Sr ratio was obtained in six samples, with values ranging from 0.706793 to 0.706839, which match marine calcium-sulphate data of the same age. A similar conclusion may be derived from ten samples analysed for oxygen (18O) and sulphur (34S) isotopic composition: the obtained values are between +11.55‰ and +14.42‰, and between +17.25‰ and +18.48‰ respectively. The sedimentologic-stratigraphic evidence and the isotopic data both suggest a marine origin for the Tábanos and Auquilco evaporites, without an analytically detectable contribution of continental waters or hydrothermal solutions. The results also suggest that no isotope fractionation occurred during the primary gypsum-to-anhydrite-to-secondary gypsum transformations.
publishDate 2005
dc.date.none.fl_str_mv 2005
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/16877
url https://hdl.handle.net/2445/16877
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a http://doi.org/10.1344/105.000001404
Geologica Acta, 2005, vol. 3, núm. 2, p. 155-161
http://doi.org/10.1344/105.000001404
dc.rights.none.fl_str_mv cc by-sa (c) Lo Forte el al., 2005
http://creativecommons.org/licenses/by-sa/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc by-sa (c) Lo Forte el al., 2005
http://creativecommons.org/licenses/by-sa/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
publisher.none.fl_str_mv Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301629

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