Ajuste isostático Flexural en una transecta a los 43º que atravieza el Macizo de Somuncurá

GIMÉNEZ, M.; MARTÍNEZ, P.; RUIZ, F.; INTROCASO, A.; HALLER,M.; RAPALINI, A.E.; LÓPEZ DE LUCHI, M. G.; LINCE-KLINGER, F.

Río de Janeiro

Congreso; 10th International Congress of the Brazilian Geophysical Society.; 2007

Sociedad Brasileñan de Geofísica

An isostatic analysis was made on a profile centered at the 43° of south latitude that it unites the cities of Trelew in the Atlantic coast Argentina and the city of Chaiten in the coast of the Pacific in Chile. Standard crustal thickness was assumed as 35 km (Tn), while crustal and upper mantle densities were considered as 2.9 g/cm3 and 3.3 g/cm3 respectively. This crust is subjected to compression, and to the weight of the topographical and sedimentary load deposited on it, where the load is partially supported by the elastic strength inside the mentioned crust. The gravity effect produced by the elastic flexions due to  the topographical load when varying the equivalent elastic thickness of the crust (Te = 0, 5, 10, and 30 km) they are smaller than the Bouguer anomaly in all the cases. The result of this study indicates isostatic sub compensation for the whole profile pointing out a deficit of cortical thickness supporting the ideas of cortical attenuation in these latitudes