Geophysical model with gravimetric and aeromagnetometric data in northeast Patagonian massif, Río Negro, Argentina
Keywords:
aeromagnetometric, gravimetric, model, crustAbstract
To infer crustal distribution for different outcrop lithological units in the northeastern North Patagonian Massif border, Rio Negro province, Argentine, a double inversion model was built using terrestrial gravimetric and aeromagnetometric data. This model, supported by pole reduction and analytic signal maps obtained from aeromagnetic anomaly grids, allows us divide the upper crust in three magnetic domains. The density and magnetic susceptibility lateral variations could be linked to crustal blocks which differ in their genetic origin. These interpretations are in agreement with hypothesis in the North of Patagonia presented by other authors. As a result from the obtained model, we propose a thicker layer related to Yaminué Complex and, probably, its lithological contact with the Nahuel Niyeu formation.
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References
Baranov, V., 1957. Potential field and their transformations in applied geophysics. Gerbünder Bonntraeger, Berlin. 121 p.
Basei, M.A.S., Varela, R., Sato, A.M., Siga, J.R. y Llambías, E.J., 2002. Geocronología sobre rocas del Complejo Yaminué, Macizo Norpatagónico, Río Negro, Argentina. Actas 15° Congreso Geológico Argentino, 3: 117-122, El Calafate. Argentina.
Blakely, R., 1995. Potential theory in gravity and magnetic applications. Cambridge University Press. 441 pp. Cambridge.
Caminos, R., 2001. Descripción Geológica de la Hoja Valcheta 4166I, Provincia de Río Negro. Servicio Geológico Minero Argentino. Boletín N° 310, 78p.
Caminos, R. y Llambías E.J., 1984. El basamento cristalino. In: Ramos, V.A. (ed.). Geología y Recursos Naturales de la provincia de Río Negro. Buenos Aires, 9th Congreso Geológico Argentino, Relatorio, 37-63.
Chandler, V.W., Koski, J.S., Hinze, W.J. y Braile, L.W., 1981. Analysis of multi source gravity and magnetic anomaly data set by moving-window application of Poisson’s theorem. Geophysics 46: 30-39.
Chernicoff, C.J. y Caminos, R., 1996a. Estructura y relaciones estratigráficas de la Formación Nahuel Niyeu, Macizo Norpatagónico oriental, Provincia de Río Negro. Revista de la Asociación Geológica Argentina, 51: 201-212.
Chernicoff, C.J. y Caminos, R., 1996b. Estructura y metamorfismo del Complejo Yaminué, Macizo Norpatagónico oriental, provincia de Rio Negro. Revista de la Asociación Geológica Argentina, 51: 107-118
Chernicoff, C.J., Zappettini, E.O., Santos, J.O.S., Mc Naughton, N.J. y Belousova, E., 2013. Combined U-Pb SHRIMP and Hf isotope study of the Late Paleozoic Yaminué Complex, Rio Negro Province, Argentina: Implications for the origin and evolution of the Patagonia composite terrane. Geoscience Frontiers, 4: 37-56.
Cordell, L. y Taylor, P., 1971. Investigation of magnetization and density of a North Atlantic seamount using Piosson´s theorem. Geophysics, 36: 919-937.
Croce, F., Lince Klinger, F., Giménez, M., Martínez, M.P., Ruiz, F., 2009. Estimación de Profundidades Del Complejo Plutónico Navarrete Mediante Procesamiento Gravimetrico. Geoacta, (34): 1-8.
Gregori, D., Kostadinoff, J., Strazzere, L., Raniolo, A., 2008. Tectonic significance and consequences of the Gondwanide orogeny in northern Patagonia, Argentina. Gondwana Research, 14: 429–450.
Lince Klinger, F., Giménez, M.E., Martínez, M.P., Rapalini, A., Novara, I., 2010a. Poisson relation applied to the Navarrete Plutonic Complex, northeast North- Patagonian Massif, Argentina. Geofísica Internacional, 49 (4): 263-274.
Lince Klinger, F., Martínez, M.P., Rapalini, A.E., Giménez, M.E., Croce, F.A. y Ruiz, F., 2010b. Modelo gravimétrico en el borde noreste del macizo Norpatagónico. Revista Brasilera de Geofísica, 28 (3).
López de Luchi, M.G., Rapalini, A.E., Tomezzoli, R.N., 2010. Magnetic Fabric and Microstructures of Late Paleozoic granitoids from the North Patagonian Massif: Evidence of a collision between Patagonia and Gondwana?. Tectonophysics, 494: 118–137.
Llambías, E.J., Varela, R., Basei, M., Sato, A.M., 2002. Deformación y metamorfismo Neopaleozoico en Yaminué, Macizo Norpatagónico (40°50'S, 67°40'W): su relación con la Fase Orogénica San Rafael y el arco de los Gondwánides. Actas 15° Congreso Geológico Argentino, 3: 123-128. Buenos Aires.
Manceñido, M.O. y Damborenea, S.E., 1984. Megafauna de Invertebrados paleozoicos y mesozoicos. San Carlos de Bariloche, Relatorio del 9th Congreso Geológico Argentino, 413-465.
Nabighian, M.N., 1972. The analytic signal of two- dimentional magnetic bodies with polygonal crosssecction: its properties and use for automated interpretation. Geophysics, 37: 780–786.
Nabighian, M.N., 1974. Additional comments on the analytic signal of twodimensional magnetic bodies with polygonal cross-section. Geophysics, 39: 85-92.
Pankhurst, R.J., Rapela, C.W., Fanning, C.M., Márquez, M., 2006. Gondwanide continental collision and the origin of Patagonia. Earth-Science Reviews, 76: 235-257.
Rapalini, A.E., López de Luchi, M., Martinez Dopico, C., Lince Klinger, F., Giménez, M., Martínez, P., 2010. Did Patagonia collide against Gondwana in the Late Paleozoic?. Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif. Geológica Acta, 8 (4): 349-371.
Rapela, C.W. y Caminos, R., 1987. Geochemical characteristics of the Upper Paleozoic magmatism in the eastern sector of Northpatagonian Massif. Revista Brasileira de Geociencias, 17 (4): 535- 543.
Roest, W.R. y Pilkington, M., 1993. Identifying remanent magnetization effects in magnetic data. Geophysics, 58: 653-9.
Talwani, M., Worzel, J.L. y Landisman, M., 1959. Rapid gravity computations for two dimensional bodies with application to the Mendocino Submarine Fracture zone. Journal of Geophysical Reserch, 64(1): 49-58.
Uriz, N.J., Cingolani, C.A., Chemale, J.R., Macambira, M.J., 2008. Edades U-Pb en circones detríticos del Grupo Ventana (Provincia de Buenos Aires) y de la Formación Sierra Grande (Macizo Nordpatagónico): Análisis comparativo de Procedencia. San Salvador de Jujuy, 17th Congreso Geológico Argentino, Abstracts, 912-914.
Von Gosen, W., 2003. Thrust tectonics in the North Patagonian massif (Argentina): implications for a Patagonian plate. Tectonics, 22 (1): 1005, 33pp. doi:10.1029/2001TC901039.
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Copyright (c) 2014 Federico Lince Klinger, Martín León, Cecilia Weidmann, Sheila Anci, Orlando Álvarez
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