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Análisis Isostático Flexural en la transecta a la latitud 43°S que atraviesa el Macizo de SomuncuraNormal access

Authors: Mario Gimenez, Patricia Martinez, Francisco Ruiz, Antonio Introcaso, Miguel Haller, Augusto Rapalini, Lopez de Luchi and Federico Lince Klinger
Event name: 10th International Congress of the Brazilian Geophysical Society
Session: Thermo-Mechanical properties of lithosphere
Publication date: 19 November 2007
Organisations: SBGf
Language: Portuguese
Info: Extended abstract, PDF ( 363.91Kb )

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 her, where the load is partially supported by the elastic strength inside the mentioned crust. The gravity effect produced by the elastic flexions that it causes 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.

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