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The South American Platform was part of the Western Gondwana, a collage of plates of different ages assembled in late Neoproterozoic to Cambrian times. The Transbrasiliano Lineament, a continental shear belt that transversely intersects this platform from NE to SW, has its southern expression in the tectonic boundary between the Río de La Plata Craton and the Pampean Terrane. Magnetotelluric long-period data in a W-E profile (29°30' S) that crosses the Ambargasta-Sumampa Range and the Chaco-Pampean Plain were obtained to connect information of this mostly inferred tectonic boundary. A 2-D inversion model shows the Chacoparanense basin, Río Dulce lineament, Ambargasta-Sumampa Range and Salina de Ambargasta in the upper crust. At mid-to-lower crust and 40km to the east of the Ambargasta-Sumampa Range, a discontinuity (500-2000Ωm) of 20-km-wide separates two highly resistive blocks, the Río de La Plata Craton (6000-20,000Ωm) in the east, and the Pampean Terrane (5000-20,000Ωm) in the west. This discontinuity represents the tectonic boundary between both cratons and could be explained by the presence of graphite. The geometry of the Pampean Terrane suggests an east-dipping paleo-subduction. Our results are consistent with gravimetric and seismicity data of the study area. A more conductive feature beneath the range and the tectonic boundary was associated with the NE-SW dextral transpressive system evidenced by the mylonitic belts exposed in the Eastern Pampean Ranges. This belt represents a conjugate of the mega-shear Transbrasiliano Lineament and could be explained by fluid-rock interaction by shearing during hundreds of years. The eastern border of the Ambargasta-Sumampa Range extends the trace of the Transbrasiliano Lineament. Theelectrical Moho depth (40km to the west and 35km to the east) was identified by a high electrical contrast between the crust and upper mantle. The upper mantle shows a resistive structure beneath the Río de La Plata Craton that could have been originated by stationary delamination by the presence of hydrated lithosphere. © 2015 Elsevier Ltd.


Documento: Artículo
Título:Magnetotelluric characterization through the Ambargasta-Sumampa Range: The connection between the northern and southern trace of the Río de La Plata Craton - Pampean Terrane tectonic boundary
Autor:Peri, V.G.; Barcelona, H.; Pomposiello, M.C.; Favetto, A.
Filiación:Instituto de Geocronología y Geología Isotópica, Pabellón INGEIS, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Universitaria, Ciudad de Buenos Aires, C1428EHA, Argentina
Palabras clave:Ambargasta-Sumampa Range; Chaco-Pampean Plain; Magnetotelluric; Pampean Terrane; Río de La Plata Craton; Transbrasiliano Lineament; Cambrian; continental margin; craton; data inversion; electrical method; electrical resistivity; lineament; lithospheric structure; magnetotelluric method; Moho; plate boundary; Proterozoic; subduction zone; tectonic setting; two-dimensional modeling; South America
Página de inicio:1
Página de fin:12
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.


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---------- APA ----------
Peri, V.G., Barcelona, H., Pomposiello, M.C. & Favetto, A. (2015) . Magnetotelluric characterization through the Ambargasta-Sumampa Range: The connection between the northern and southern trace of the Río de La Plata Craton - Pampean Terrane tectonic boundary. Journal of South American Earth Sciences, 59, 1-12.
---------- CHICAGO ----------
Peri, V.G., Barcelona, H., Pomposiello, M.C., Favetto, A. "Magnetotelluric characterization through the Ambargasta-Sumampa Range: The connection between the northern and southern trace of the Río de La Plata Craton - Pampean Terrane tectonic boundary" . Journal of South American Earth Sciences 59 (2015) : 1-12.
---------- MLA ----------
Peri, V.G., Barcelona, H., Pomposiello, M.C., Favetto, A. "Magnetotelluric characterization through the Ambargasta-Sumampa Range: The connection between the northern and southern trace of the Río de La Plata Craton - Pampean Terrane tectonic boundary" . Journal of South American Earth Sciences, vol. 59, 2015, pp. 1-12.
---------- VANCOUVER ----------
Peri, V.G., Barcelona, H., Pomposiello, M.C., Favetto, A. Magnetotelluric characterization through the Ambargasta-Sumampa Range: The connection between the northern and southern trace of the Río de La Plata Craton - Pampean Terrane tectonic boundary. J. South Am. Earth Sci. 2015;59:1-12.