Abstract

ARECCO, María Alejandra; PIZARRO, Guillermo  and  RUIZ, Francisco. Gravimetric method application in the Argentine margin. Geoacta [online]. 2014, vol.39, n.1, pp.20-29. ISSN 1852-7744.

The detection of the reflector basalt wedges inclined towards the sea (seaward-dipping-reflectors, SDRs) was a significant finding to determine the edge of the Argentine passive volcanic margin, one that allows determining the continental nature of the crust that contains them. This research develops a tool to demonstrate the natural extension of the continent and the location of the continental and oceanic crust boundary (COB). We implemented two different processes for gravimetric anomalies: i) the application of filters and enhancement techniques to Bouguer anomalies (BA), and ii) 2D gravity modeling. In the first process is applied using the analytical signal (AS), the tilt angle (TDR) and the horizontal gradient of the tilt angle (TDR_THDR). In the second process, we generated a 2D gravity model that allowed for a clear visualization of complex structures in the margin. A joint analysis of 2D modeling and characteristics of the curves obtained from enhancement techniques have identified the COB and extrapolated it to the entire range for its clear delineation.

Keywords : Analytic Signal; Tilt; TDR_THDR; COB; 2D gravimetric model.

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