CONICET | Buscador de Institutos y Recursos Humanos

This paper presents the gravimetricanalysis together with seismic data as an integral application in order toidentify the continental?oceanic crust boundary (COB) of the Argentine continentalmargin from 36◦S to 50◦S in a continuousway. The gravimetric and seismic data are made up of large grids of dataobtained from satellite altimetry and marine research. The methodology consistsof three distinct methods: (i) the application of enhancement techniques togravimetric anomalies, (ii) the calculation of crustal thinning from 3-Dgravity inversion modeling of the crust?mantle discontinuity and (iii) 2-Dgravimetric modeling supported by multichannel reflection and refractionseismic profiles. In the first method, the analytic signal, Theta map, and tiltangle and its horizontal derivative were applied. In the second method, crustalthickness was obtained as the difference in the depths of the crystallinebasement and the crust?mantle discontinuity; thelatter was obtained via gravimetric inversion. Finally, 2-D modeling wasperformed from free-air anomalies in two representative sections by consideringas restriction surfaces those coming from the interpretation of seismic data.The results of the joint application of enhancement techniques and 2-D and 3-D modelinghave enabled continuous interpretation of the COB. In this study, the COB wasdetermined continuously from the integration of 2-D profiles of the enhancementtechniques, taking account of crustal thickness and performing 2-D gravimetric modeling.The modeling technique was complemented by regional studies integrated withmultichannel seismic reflection and seismic refraction lines, resulting inconsistent enhancement techniques.