Ajuste isostático Flexural en una transecata a los 43º que atravieza el Macizo de Samuncurá .

GIMENEZ, MARIO E; MARTINEZ, M. PATRICIA; RUÍZ, FANCISCO; INTROCASO, A.; HALLER, MIGUEL; RAPALINI, AUGUSTO .E.; LOPEZ DE LUCHI, M.G.; LINCE KLINGER, FEDERICO

Rio de Janeiro

Congreso; 10th International Congress of TheBrazilian Geophysical Society held in Rio de Janeiro, Brazil, 19-22 November 2007.; 2007

Sociedad Brazilera de Geofìsica

AbstractAn isostatic analysis was made on a profile centered atthe 43° of south latitude that it unites the cities of Trelewin the Atlantic coast Argentina and the city of Chaiten inthe coast of the Pacific in Chile.Standard crustal thickness was assumed as 35 km (Tn),while crustal and upper mantle densities were consideredas 2.9 g/cm3 and 3.3 g/cm3 respectively.This crust is subjected to compression, and to the weightof the topographical and sedimentary load deposited onher, where the load is partially supported by the elasticstrength inside the mentioned crust.The gravity effect produced by the elastic flexions that itcauses the topographical load when varying theequivalent elastic thickness of the crust (Te = 0, 5, 10,and 30 km) they are smaller than the Bouguer anomaly inall the cases. The result of this study indicates isostaticsub-compensation for the whole profile pointing out adeficit of cortical thickness supporting the ideas of corticalattenuation in these latitudes.