Abstract

ANCI, Sheila et al. Interpretación de la corteza superior a partir demétodos potenciales en la región de la Payenia y faja plegada y corrida de Malargüe. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.2, pp.159-172. ISSN 0004-4822.

Different geophysical techniques, such as the potential field methods, were applied to characterize Andean depocenters along the northwestern border of the Neuquén basin, in the Payenia geological province. Around of 2240 new Differential Global Positioning System (DGPS) values supported gravimetric and magnetometric measurements were complemented with over 10000 gravity values from several survey campaigns carried out by researchers from the Volponi Geophysics and Seismological Institute through the last three decades. Additionally digital data from aeromagnetic reports by Servicio Geológico Minero Argentino (SEGEMAR) were provided by YPF S.A. Gravimetric and magnetometric maps were constructed to study the upper crustal sources. 2D and 3D inversion gravimetric models were prepared integrating geologic and geophysical information, with an emphasis in the resolution of structures placed to the east of Palauco. The 3D model of crystalline basement based on the average density values from a local well played a key role in identifying structural highs and lows structures already studied by other authors as well as a sub basin not yet reported. The detailed profile gives information about the 2D depocenter structure, showing a deepening and filling which wedges into a raised basement block belonging to San Rafael block. The volcanic-clastic infill of the newly reported depocenter reaches a maximum thickness of up to 4000 meters.

Keywords : Sediment thickness; Fold and trhust belt; 2D and 3D inversion gravimetric models.

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