Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina
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Universitat de Barcelona
2005
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| _version_ | 1876484226071658496 |
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| author | G.L. Lo Forte |
| author_facet | G.L. Lo Forte |
| contents | Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina G.L. Lo Forte F. Ortí L. Rosell Ciencias de la Tierra Jurassic Aconcagua Argentina Neuquén Basin Marine evaporites Isotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study ofstrontium, 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 LasLeñitas, 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 petrographicanalysis and X-ray diffraction. The 87Sr/86Sr ratio was obtained in six samples, with values ranging from0.706793 to 0.706839, which match marine calcium-sulphate data of the same age. A similar conclusion may bederived from ten samples analysed for oxygen (18O) and sulphur (34S) isotopic composition: the obtained valuesare 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. Theresults also suggest that no isotope fractionation occurred during the primary gypsum-to-anhydrite-to-secondarygypsum transformations. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530207 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| format | Artículo científico |
| id | redalyc_50530207 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina G.L. Lo Forte Ciencias de la Tierra Jurassic Aconcagua Argentina Neuquén Basin Marine evaporites Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina G.L. Lo Forte F. Ortí L. Rosell Ciencias de la Tierra Jurassic Aconcagua Argentina Neuquén Basin Marine evaporites Isotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study ofstrontium, 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 LasLeñitas, 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 petrographicanalysis and X-ray diffraction. The 87Sr/86Sr ratio was obtained in six samples, with values ranging from0.706793 to 0.706839, which match marine calcium-sulphate data of the same age. A similar conclusion may bederived from ten samples analysed for oxygen (18O) and sulphur (34S) isotopic composition: the obtained valuesare 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. Theresults also suggest that no isotope fractionation occurred during the primary gypsum-to-anhydrite-to-secondarygypsum transformations. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530207 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| title | Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina |
| topic | Ciencias de la Tierra Jurassic Aconcagua Argentina Neuquén Basin Marine evaporites |
| url | https://www.redalyc.org/articulo.oa?id=50530207 |