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 evaporates (Tábanos Formation and Auquilco Formation) outcropping in southern Mendoza, Aconcagua-...

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Detalles Bibliográficos
Autores: Lo Forte, G. L., Ortí, F., Rosell, L.
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:86049
Acceso en línea:https://ddd.uab.cat/record/86049
https://dx.doi.org/urn:doi:10.1344/105.000001404
Access Level:acceso abierto
Palabra clave:Marine evaporites
Isotopic composition
Jurassic
Aconcagua-Neuquén Basin
Argentina
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spelling Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, ArgentinaLo Forte, G. L.Ortí, F.Rosell, L.Marine evaporitesIsotopic compositionJurassicAconcagua-Neuquén BasinArgentinaIsotopic 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 evaporates (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 (d18O) and sulphur (d34S) 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.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) 22005-01-0120052005-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/86049https://dx.doi.org/urn:doi:10.1344/105.000001404reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:860492026-06-06T12:50:31Z
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.
Marine evaporites
Isotopic composition
Jurassic
Aconcagua-Neuquén Basin
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, F.
Rosell, L.
author Lo Forte, G. L.
author_facet Lo Forte, G. L.
Ortí, F.
Rosell, L.
author_role author
author2 Ortí, F.
Rosell, L.
author2_role author
author
dc.contributor.none.fl_str_mv Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
dc.subject.none.fl_str_mv Marine evaporites
Isotopic composition
Jurassic
Aconcagua-Neuquén Basin
Argentina
topic Marine evaporites
Isotopic composition
Jurassic
Aconcagua-Neuquén Basin
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 evaporates (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 (d18O) and sulphur (d34S) 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 2
2005-01-01
2005
2005-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/86049
https://dx.doi.org/urn:doi:10.1344/105.000001404
url https://ddd.uab.cat/record/86049
https://dx.doi.org/urn:doi:10.1344/105.000001404
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/3.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
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eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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