Artículo

Drobe, M.; de Luchi, M.L.; Steenken, A.; Wemmer, K.; Naumann, R.; Frei, R.; Siegesmund, S. "Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data" (2011) International Journal of Earth Sciences. 100(2):631-657
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Abstract:

Whole-rock geochemical analyses using major and trace elements in combination with the Sm-Nd and Pb-Pb isotope systems, together with SHRIMP age dating on metasedimentary rocks from the Sierras de Chepes, the Sierras de Córdoba, the Sierra Norte and the San Luis Formation in the Sierra de San Luis, have been carried out to unravel the provenance and the geodynamic history of the Eastern Sierras Pampeanas, Central Argentina. The geochemical and the Sm-Nd data point to a slightly stronger mafic and less-fractionated material in the provenance area of the Sierras de Córdoba when compared to the other units. The TDM model ages from the Sierras de Chepes (~1.82 Ga) and the Sierra Norte (~1.79 Ga) are significantly older than the data from the Sierras de Córdoba (1.67 Ga). The Pb data are homogeneous for the different units. Only the 208Pb/204Pb ratios of some samples from the Sierras de Córdoba are higher. A late Pampean detrital zircon peak around 520 Ma from the Sierras de Chepes is in accordance with the new data from the San Luis Formation. This is similar to the literature data from the Famatina Belt located to the northwest of the Sierras de Chepes and also fits the detrital zircon peaks in the Mesón group. These maximum depositional ages were also reported from some locations in the Puncoviscana Formation but are absent in the Sierras de Córdoba. An improved model for the development of the Eastern Sierras Pampeanas in the area between the Sierras de Córdoba and the Puncoviscana Formation is provided. This gives new insights into the late Pampean development of the Sierra de San Luis and the complex development of the Eastern Sierras Pampeanas. This new model explains the younger detrital ages in the Puncoviscana Formation compared with the older ages of the Sierras de Córdoba. Another model of the Sierra de San Luis explains the younger depositional ages of the Pringles Metamorphic Complex and the San Luis Formation when compared to the Nogolí Metamorphic Complex and the Conlara Metamorphic Complex. Additionally, the rather fast change of the high-grade metamorphic conditions in the Pringles Metamorphic Complex and the low-grade metamorphic conditions in the San Luis Formation is explained by extension, the ascent of (ultra) mafic material and later folding and erosion. © 2010 The Author(s).

Registro:

Documento: Artículo
Título:Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data
Autor:Drobe, M.; de Luchi, M.L.; Steenken, A.; Wemmer, K.; Naumann, R.; Frei, R.; Siegesmund, S.
Filiación:Geoscience Centre of the Georg-August-Universität, Goldschmidtstr. 3, 37077 Göttingen, Germany
Instituto de Geocronología y Geología Isotópica, INGEIS, Pabellón INGEIS, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Institut für Geographie und Geologie, Universität Greifswald, Friedrich-Ludwig-Jahn-Str. 17A, 17487 Greifswald, Germany
GFZ Potsdam, Telegraphenberg 327 B, 14473 Potsdam, Germany
Institute of Geography and Geology, University of Copenhagen, Nordic Center for Earth Evolution (NordCEE), Řster Voldgade 10, 1350 Copenhagen K, Denmark
Palabras clave:Eastern Sierras Pampeanas; Geodynamic evolution; Gondwana margin; Provenance; Tectonic setting; age determination; geochemistry; geodynamics; Gondwana; lead-lead dating; metamorphism; samarium-neodymium dating; SHRIMP dating; tectonic setting; Argentina; Sierras Pampeanas
Año:2011
Volumen:100
Número:2
Página de inicio:631
Página de fin:657
DOI: http://dx.doi.org/10.1007/s00531-010-0593-3
Título revista:International Journal of Earth Sciences
Título revista abreviado:Int. J. Earth Sci.
ISSN:14373254
CODEN:IJESF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14373254_v100_n2_p631_Drobe

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Citas:

---------- APA ----------
Drobe, M., de Luchi, M.L., Steenken, A., Wemmer, K., Naumann, R., Frei, R. & Siegesmund, S. (2011) . Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data. International Journal of Earth Sciences, 100(2), 631-657.
http://dx.doi.org/10.1007/s00531-010-0593-3
---------- CHICAGO ----------
Drobe, M., de Luchi, M.L., Steenken, A., Wemmer, K., Naumann, R., Frei, R., et al. "Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data" . International Journal of Earth Sciences 100, no. 2 (2011) : 631-657.
http://dx.doi.org/10.1007/s00531-010-0593-3
---------- MLA ----------
Drobe, M., de Luchi, M.L., Steenken, A., Wemmer, K., Naumann, R., Frei, R., et al. "Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data" . International Journal of Earth Sciences, vol. 100, no. 2, 2011, pp. 631-657.
http://dx.doi.org/10.1007/s00531-010-0593-3
---------- VANCOUVER ----------
Drobe, M., de Luchi, M.L., Steenken, A., Wemmer, K., Naumann, R., Frei, R., et al. Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data. Int. J. Earth Sci. 2011;100(2):631-657.
http://dx.doi.org/10.1007/s00531-010-0593-3