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      Interpretación de la corteza superior a partir demétodos potenciales en la región de la Payenia y faja plegada y corrida de Malargüe

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          Abstract

          Se llevó a cabo un estudio gravi-magnetométrico a escala cortical para caracterizar los depocentros andinos del borde noroeste de la Cuenca Neuquina, situados enla provincia geológica de Payenia. Para ello se efectuaron mediciones (2240 estaciones) tanto del campo gravitatorio como magnético, apoyadas en mediciones de GPS diferencial (DGPS), valores de campo que fueron sumados a la extensa base de datos con la que cuenta el Instituto Geofísico Sismológico Volponi (IGSV). Se incorporaron datos de relevamientos aeromagnéticos suministrados por YPF S.A para cubrir las zonas sin datos terrestres. Se prepararon modelos 2D y 3D de inversión gravimétrica, con énfasis en la resolución de estructuras ubicas al este de la sierra de Palauco. Un modelo 3D de tres capas, apoyado en densidades de afloramientos y en valores de densidad de un pozo de exploración, permitió identificar con buena resolución geométrica altos y bajos estructurales del basamento y una subcuenca no reportada hasta el presente, en el borde este de la faja plegada y corrida de Malargüe y que se acuña con los afloramientos del basamento cristalino del bloque de San Rafael. Se modeló una sección gravimétrica de detalle que brinda información 2D de la estructura del mismo, especialmente al este de la sierra de Palauco donde se observa una profundización del relleno sedimentario. El espesor de la cubierta volcánico-clástica de este depocentro presenta su máximo hacia el este acuñándose bajo el bloque San Rafael.

          Translated abstract

          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.

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          Most cited references 51

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          Empirical Relations between Elastic Wavespeeds and Density in the Earth's Crust

           T. Brocher (2005)
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            Potential Theory in Gravity and Magnetic Applications

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              MACHINE CONTOURING USING MINIMUM CURVATURE

               Ian C. Briggs (1974)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                raga
                Revista de la Asociación Geológica Argentina
                Rev. Asoc. Geol. Argent.
                Asociación Geológica Argentina (Buenos Aires, , Argentina )
                0004-4822
                1851-8249
                June 2016
                : 73
                : 2
                : 159-172
                Affiliations
                orgnameFCEFN orgdiv1Universidad Nacional de San Juan-CONICET orgdiv2Instituto Geofísico Sismológico Ing. F. S. Volponi
                Article
                S0004-48222016000200001

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 52, Pages: 14
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