HR: 0830h
AN: S41D-0127    [PDF]
TI: Seismic Study of the Southernmost Andes. The Contact Between Scotia and South American Plates
AU: Tassone, A
EM: atassone@gl.fcen.uba.ar
AF: CONICET, Dpto. Geol., FCEyN, Univ. de Buenos Aires, Ciudad Universitaria, Bs. As, 1428 Argentina
AU: Cominguez, A H
EM: ahcominguezg@repsolypf.com
AF: CONICET, Dpto. Geof. Aplicada, FCAG, Univ. Nac. de La Plata, Paseo del Bosque s/n, La Plata, BA 1900 Argentina
AU: Yagupsky, D
EM: danielyag@arnet.com.ar
AF: CONICET, Dpto. Geol., FCEyN, Univ. de Buenos Aires, Ciudad Universitaria, Bs. As, 1428 Argentina
AU: * Alvarado, P
EM: alvarado@geo.arizona.edu
AF: University of Arizona, Gould-Simpson Bldg. 1040 E. 4 St., Tucson, AZ 85721 United States
AU: * Alvarado, P
EM: alvarado@geo.arizona.edu
AF: Universidad Nacional de San Juan, Meglioli 1160 S, San Juan, SJ 5400 Argentina
AU: Lodolo, E
EM: elodolo@ogs.trieste.it
AF: Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/C, Trieste, 34016 Italy
AU: Menichetti, M
EM: menichetti@uniurb.it
AF: Istituto di Geodinamica e Sedimentologia. Universit… di Urbino, Campus Scientifico - Loc. Crocicchia, Urbino, 61029 Italy
AB: The relationships between the sinistral Magallanes-Fagnano continental transform fault (MFS), a major segment of the boundary between Scotia-South American plates, and the northern flank of the western Scotia Sea, characterized mostly by compressional structures, have not been yet clearly identified. From data processing, depth seismic-migration modeling and interpretation of 800 km of seismic reflection profiles, this study presents one morpho-structural analysis of these two main tectonic elements. In the offshore part of the Malvinas fold-and-thrust belt, five main seismic units have been recognized. 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 American-Scotia plate boundary. In the SW border of Malvinas Basin, four major discontinuities were recognized. Each discontinuity represents important changes in the regional geodynamic evolution: Early-Late Jurassic rift; Thermal subsidence (Late Jurassic-Late Cretaceous); Transitional stage, to Foreland basin (Late Cretaceous-Eocene) and Foreland (since Eocene).
DE: 7205 Continental crust (1242)
DE: 7220 Oceanic crust
DE: 8110 Continental tectonics--general (0905)
DE: 8150 Plate boundary--general (3040)
DE: 9360 South America
SC: Seismology [S]
MN: 2003 Fall Meeting