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Abstract:

Rb-Sr and Sm-Nd whole-rock data for granitoids and orthogneisses from the western part of the Sierras Septentrionales of the southern Buenos Aires province yield an errorchron of 2009±71 Ma (initial 87Sr/86Sr=0.7041, MSWD=69) and an isochron of 2140±88 Ma (initial 143Nd/ 144Nd=0.50977), respectively. As in previous investigations, the Rb-Sr data are clearly disturbed, but the Sm-Nd isochron may record the age of emplacement of igneous precursors. These results reaffirm that this region is the southern extension of the crystalline basement of the Río de la Plata craton. The Sm-Nd age, though not very precise, is slightly older than previously demonstrated but consistent with most recent U-Pb studies of the craton exposed in Uruguay and Brazil. Crust-derived Sm-Nd model ages averaging 2620±80 Ma indicate that, though the principal rock-forming events were Paleoproterozoic, a Late Archaean prehistory is possible. However, the data place strict constraints on the nature and intensity of post-2000 Ma activity in this area, which seems to be confined to tholeiitic dyke emplacement and hydrothermal reactivation. © 2003 Elsevier Science Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Antiquity of the Río de la Plata craton in Tandilia, southern Buenos Aires province, Argentina
Autor:Pankhurst, R.J.; Ramos, A.; Linares, E.
Filiación:British Antarctic Survey, Cambridge, United Kingdom
NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, United Kingdom
INGEIS, CONICET. Pabellón INGEIS, Ciudad Universitaria, Buenos Aires 1428, Argentina
Palabras clave:Continental crust formation; Geochronology; Neodymium isotopes; Proterozoic; Transamazonian orogeny; continental crust; geochronology; Gondwana; Proterozoic; samarium-neodymium dating; uranium-lead dating; Argentina; Buenos Aires Province; Tandilia
Año:2003
Volumen:16
Número:1
Página de inicio:5
Página de fin:13
DOI: http://dx.doi.org/10.1016/S0895-9811(03)00015-4
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v16_n1_p5_Pankhurst

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Citas:

---------- APA ----------
Pankhurst, R.J., Ramos, A. & Linares, E. (2003) . Antiquity of the Río de la Plata craton in Tandilia, southern Buenos Aires province, Argentina. Journal of South American Earth Sciences, 16(1), 5-13.
http://dx.doi.org/10.1016/S0895-9811(03)00015-4
---------- CHICAGO ----------
Pankhurst, R.J., Ramos, A., Linares, E. "Antiquity of the Río de la Plata craton in Tandilia, southern Buenos Aires province, Argentina" . Journal of South American Earth Sciences 16, no. 1 (2003) : 5-13.
http://dx.doi.org/10.1016/S0895-9811(03)00015-4
---------- MLA ----------
Pankhurst, R.J., Ramos, A., Linares, E. "Antiquity of the Río de la Plata craton in Tandilia, southern Buenos Aires province, Argentina" . Journal of South American Earth Sciences, vol. 16, no. 1, 2003, pp. 5-13.
http://dx.doi.org/10.1016/S0895-9811(03)00015-4
---------- VANCOUVER ----------
Pankhurst, R.J., Ramos, A., Linares, E. Antiquity of the Río de la Plata craton in Tandilia, southern Buenos Aires province, Argentina. J. South Am. Earth Sci. 2003;16(1):5-13.
http://dx.doi.org/10.1016/S0895-9811(03)00015-4