Artículo

Siegesmund, S.; Steenken, A.; Martino, R.D.; Wemmer, K.; Ló de Luchi, M.G.; Frei, R.; Presnyakov, S.; Guereschi, A. "Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)" (2010) International Journal of Earth Sciences. 99(6):1199-1226
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Abstract:

The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results indicate that the metamorphic history recorded by Crd-free gneisses (M2) started in the latest Neoproterozoic/earliest Cambrian (553 and 543 Ma) followed by the M4 metamorphism at ~530 Ma that is documented in the diatexites. Zircon ages of 492 Ma in the San Carlos Massif correlate partly with rather low Th/U ratios (<0.1) suggesting their growth by metamorphic fluids. This age is even younger than the PbSL titanite ages of 506 Ma. It is suggested that the fluid alteration relates to the beginning of the Famatinien metamorphic cycle in the neighbouring Sierra de San Luis and has not affected the titanite ages. The PTt evolution can be correlated with the plate tectonic processes responsible for the formation of the Pampean orogene, i.e., the accretion of the Pampean basement to the Río de La Plata craton (M2) and the later collision of the Western Pampean basement with the Pampean basement. © 2009 The Author(s).

Registro:

Documento: Artículo
Título:Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)
Autor:Siegesmund, S.; Steenken, A.; Martino, R.D.; Wemmer, K.; Ló de Luchi, M.G.; Frei, R.; Presnyakov, S.; Guereschi, A.
Filiación:Geoscience Centre of the Georg-August University Göttingen, Goldschmidtstrasse 3, 37077 Göttingen, Germany
Institut für Geographie und Geologie, Universität Greifswald, Friedrich-Ludwig-Jahn-Strasse 17A, 17487 Greifswald, Germany
Cátedra de Geología Tectónica, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, X 5016 GCA Córdoba, Argentina
Instituto de Geocronología y Geología Isotópica, Pebellón INGEIS, Ciudad Universitaria, C 1428 EHA Buenos Aires, Argentina
Institute of Geography and Geology, and Nordic Center for Earth Evolution (NordCEE), University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen, Denmark
Centre of Isotopic Research, All-Russian Geological Research Institute (VSEGEI), 74 Sredny prospect, 199106 Saint Petersburg, Russian Federation
Palabras clave:Eastern Sierras Pampeanas; Geodynamic evolution; Pampean and Famatinian cycles; SHRIMP dating; Sierras de Córdoba; Titanite and Garnet Pb-Pb step-wise leaching; accretion; basement rock; Cambrian; garnet; geodynamics; leaching; metamorphic rock; metamorphism; monazite; P-T-t path; Proterozoic; SHRIMP dating; tectonic evolution; tectonic setting; titanite; uranium-lead dating; zircon; Argentina; Sierras Pampeanas
Año:2010
Volumen:99
Número:6
Página de inicio:1199
Página de fin:1226
DOI: http://dx.doi.org/10.1007/s00531-009-0471-z
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_v99_n6_p1199_Siegesmund

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Citas:

---------- APA ----------
Siegesmund, S., Steenken, A., Martino, R.D., Wemmer, K., Ló de Luchi, M.G., Frei, R., Presnyakov, S.,..., Guereschi, A. (2010) . Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina). International Journal of Earth Sciences, 99(6), 1199-1226.
http://dx.doi.org/10.1007/s00531-009-0471-z
---------- CHICAGO ----------
Siegesmund, S., Steenken, A., Martino, R.D., Wemmer, K., Ló de Luchi, M.G., Frei, R., et al. "Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)" . International Journal of Earth Sciences 99, no. 6 (2010) : 1199-1226.
http://dx.doi.org/10.1007/s00531-009-0471-z
---------- MLA ----------
Siegesmund, S., Steenken, A., Martino, R.D., Wemmer, K., Ló de Luchi, M.G., Frei, R., et al. "Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)" . International Journal of Earth Sciences, vol. 99, no. 6, 2010, pp. 1199-1226.
http://dx.doi.org/10.1007/s00531-009-0471-z
---------- VANCOUVER ----------
Siegesmund, S., Steenken, A., Martino, R.D., Wemmer, K., Ló de Luchi, M.G., Frei, R., et al. Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina). Int. J. Earth Sci. 2010;99(6):1199-1226.
http://dx.doi.org/10.1007/s00531-009-0471-z