Seismic Depth-migrated seismic imagin north of Isla de los Estados, Argentina.

COMINGUEZ, A.; TASSONE, A.; LODOLO, E.

BOLLETTINO DI GEOFISICA TEORICA ED APPLICATA

ISTITUTO NAZIONALE DI OCEANOGRAFIA E DI GEOFISICA

Lugar: Trieste; Año: 2004 vol. 45 p. 222 - 225

0006-6729

Depth-migrated modeling and interpretation of a seismic reflection profile is presented in this paper. The study shows the presence of extensional, compressional and transtensional superposed tectonics structures in an area located to the north of Isla de los Estados. The profile, which crosses the offshore part of the Magallanes fold-and-thrust belt, images the deep structural framework of part of this tectonic province. Four main seismic units have been recognized. The major structure identified is a structural high and a down-faulted area with related folds of kilometric size (3-4 km). Steeply dipping (mainly to the south) reverse faults cut through the folds. Some of these faults represent old extensional faults of the Middle-Mesozoic Rocas Verdes marginal basin rifting, which have been subsequently inverted by compressional stress fields. A noticeable fault system is recognized in the seismic profile, which involves both the sedimentary cover and the acoustic basement. This fault is interpreted as the result of shear stresses produced along the transcurrent South America-Scotia plate boundary.