High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications
The classical marine Patagoniense succession at Lago Argentino, southwestern Patagonia (Argentina), known as Estancia 25 de Mayo Formation, was dated by radiometric U-Pb on zircon grains from pyroclastic rocks and 87Sr/ 86Sr ratio on calcitic oyster shells. U-Pb data yielded an age of 19.14 Ma for t...
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| 100 | 1 | |a Cuitiño, J.I. | |
| 245 | 1 | 0 | |a High resolution isotopic ages for the early Miocene "Patagoniense" transgression in Southwest Patagonia: Stratigraphic implications |
| 260 | |c 2012 | ||
| 270 | 1 | 0 | |m Cuitiño, J.I.; Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, primer piso, Ciudad Universitaria, Intendente Guiraldes 2160 (C1428EHA), Ciudad Autónoma de Buenos Aires, Argentina; email: jicuiti@yahoo.com.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Van Sickel, W.A., Kominz, M.A., Miller, K.G., Browning, J.V., Late Cretaceous and Cenozoic sea-level estimates: backstripping analysis of borehole data, onshore New Jersey (2004) Basin Research, 16, pp. 451-465 | ||
| 504 | |a Veizer, J., Davin, A., Azmy, K., Bruckschen, P., Buhl, D., Bruhn, F., Carden, G.A.F., Strauss, H., 87Sr/ 86Sr, δ 13C and δ 18O evolution of Phanerozoic seawater (1999) Chemical Geology, 161, pp. 59-88 | ||
| 520 | 3 | |a The classical marine Patagoniense succession at Lago Argentino, southwestern Patagonia (Argentina), known as Estancia 25 de Mayo Formation, was dated by radiometric U-Pb on zircon grains from pyroclastic rocks and 87Sr/ 86Sr ratio on calcitic oyster shells. U-Pb data yielded an age of 19.14 Ma for the lower portion of the Patagoniense succession and 18.85 Ma for the lowermost part of the overlying Santa Cruz Formation. 87Sr/ 86Sr data yielded ages ranging from 20.05 Ma at the lower part and 19.1 Ma for the upper portion of the Estancia 25 de Mayo Formation, in good agreement with respect to the U-Pb results. Our results constrain the age of these beds entirely into the early Miocene Burdigalian stage, and locally into the Superpatagoniense stage. Correlation with other Patagoniense units in Santa Cruz, especially in the westernmost parts of the Austral Basin, reveals the existence of a shallow and extended sea, and lack of correlation with global sea-level highstands suggests a local Andean tectonic overprint as the cause of the sea level rise. © 2012 Elsevier Ltd. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica | ||
| 536 | |a Detalles de la financiación: This work was funded by ANPCyT and CONICET of Argentina and is part of the PhD studies of JIC in the Buenos Aires University. Special thanks for the Laboratório de Estudos Geocronológicos, Geodinâmicos e Ambientais from Universidade de Brasilia, Brazil. We acknowledge the owners of settlements 25 de Mayo, Quién Sabe, Huyliches and Rincón Amigo for permission to work in their properties and Dr. Daniel Poiré for his generous help in field work facilities. We are grateful to the Regional Editor Reynaldo Charrier and an anonymous reviewer whose suggestions improved the original manuscript. | ||
| 593 | |a Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Guiraldes 2160 (C1428EHA), Ciudad Autónoma de Buenos Aires, Argentina | ||
| 593 | |a CONICET, Argentina | ||
| 593 | |a Instituto de Geociências, Universidade Federal do Rio Grande do Sul, CP 15001, 91501-970 Porto Alegre, Brazil | ||
| 593 | |a Instituto de Geociências, Universidade de Brasília, Campus Universitário Darcy Ribeiro, CEP 70910-900 Brasília, DF, Brazil | ||
| 651 | 4 | |a ARGENTINA | |
| 690 | 1 | 0 | |a AUSTRAL BASIN |
| 690 | 1 | 0 | |a GEOCHRONOLOGY |
| 690 | 1 | 0 | |a MIOCENE |
| 690 | 1 | 0 | |a PATAGONIA |
| 690 | 1 | 0 | |a SR STRATIGRAPHY |
| 690 | 1 | 0 | |a TRANSGRESSION |
| 690 | 1 | 0 | |a U-PB AGES |
| 690 | 1 | 0 | |a CHEMOSTRATIGRAPHY |
| 690 | 1 | 0 | |a CHRONOSTRATIGRAPHY |
| 690 | 1 | 0 | |a GEOCHRONOLOGY |
| 690 | 1 | 0 | |a ISOTOPIC ANALYSIS |
| 690 | 1 | 0 | |a MIOCENE |
| 690 | 1 | 0 | |a RESOLUTION |
| 690 | 1 | 0 | |a STRONTIUM ISOTOPE |
| 690 | 1 | 0 | |a TRANSGRESSION |
| 690 | 1 | 0 | |a URANIUM-LEAD DATING |
| 690 | 1 | 0 | |a PATAGONIA |
| 690 | 1 | 0 | |a OSTREIDAE |
| 700 | 1 | |a Pimentel, M.M. | |
| 700 | 1 | |a Ventura Santos, R. | |
| 700 | 1 | |a Scasso, R.A. | |
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