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Abstract:

The first successful paleomagnetic study on middle Paleoproterozoic rocks from the Rio de la Plata craton is reported. Samples collected from the Soca and Isla Mala granitic bodies, located in southern Uruguay, provided characteristic remanences that were used to compute the first paleomagnetic poles for the craton for ca. 2.05-2.02. Ga. The poles were complemented by a virtual geomagnetic pole from the slightly older Marincho and Mahoma complexes. The paleomagnetic results suggest fast apparent polar wander at high paleolatitudes for the Rio de la Plata craton. Comparison with coeval poles from the Guiana, Congo-São Francisco and West African cratons indicates that a configuration of Atlantica that resembles their Western Gondwana fit is not supported by paleomagnetic data. The geologic similarities in these four cratons are supportive of a major crustal forming event between 2.2-2.0. Ga. A modified configuration for Atlantica is proposed that is consistent with our new (and older) paleomagnetic data. Atlantica was assembled at 2.1-2.05. Ga at polar latitudes and drifted towards the equator soon afterwards. © 2014 International Association for Gondwana Research.

Registro:

Documento: Artículo
Título:Paleomagnetic study on mid-Paleoproterozoic rocks from the Rio de la Plata craton: Implications for Atlantica
Autor:Rapalini, A.E.; Sánchez Bettucci, L.; Badgen, E.; Vásquez, C.A.
Filiación:Lab. de Paleomagnetismo Daniel A. Valencio, Area Geofísica, Instituto de Geociencias Basicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, CONICET, Argentina
Departamento de Geología, Área de Geofísica-Geotectónica, Facultad de Ciencias, Universidad de la República, Iguá 4225, Malvín Norte, CP Montevideo, 11400, Uruguay
Palabras clave:Atlantica; Paleomagnetism; Paleoproterozoic; Rio de la Plata craton; South America
Año:2015
Volumen:27
Número:4
Página de inicio:1534
Página de fin:1549
DOI: http://dx.doi.org/10.1016/j.gr.2014.01.012
Título revista:Gondwana Research
Título revista abreviado:Gondwana Res.
ISSN:1342937X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v27_n4_p1534_Rapalini

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Citas:

---------- APA ----------
Rapalini, A.E., Sánchez Bettucci, L., Badgen, E. & Vásquez, C.A. (2015) . Paleomagnetic study on mid-Paleoproterozoic rocks from the Rio de la Plata craton: Implications for Atlantica. Gondwana Research, 27(4), 1534-1549.
http://dx.doi.org/10.1016/j.gr.2014.01.012
---------- CHICAGO ----------
Rapalini, A.E., Sánchez Bettucci, L., Badgen, E., Vásquez, C.A. "Paleomagnetic study on mid-Paleoproterozoic rocks from the Rio de la Plata craton: Implications for Atlantica" . Gondwana Research 27, no. 4 (2015) : 1534-1549.
http://dx.doi.org/10.1016/j.gr.2014.01.012
---------- MLA ----------
Rapalini, A.E., Sánchez Bettucci, L., Badgen, E., Vásquez, C.A. "Paleomagnetic study on mid-Paleoproterozoic rocks from the Rio de la Plata craton: Implications for Atlantica" . Gondwana Research, vol. 27, no. 4, 2015, pp. 1534-1549.
http://dx.doi.org/10.1016/j.gr.2014.01.012
---------- VANCOUVER ----------
Rapalini, A.E., Sánchez Bettucci, L., Badgen, E., Vásquez, C.A. Paleomagnetic study on mid-Paleoproterozoic rocks from the Rio de la Plata craton: Implications for Atlantica. Gondwana Res. 2015;27(4):1534-1549.
http://dx.doi.org/10.1016/j.gr.2014.01.012