Structure and Evolution of the Austral Basin Fold-Thrust Belt, Southern Patagonian Andes: Insights from 4D analogue models

LIKERMAN JEREMIAS; BURLANDO JUAN FRANCISCO; BARBERÓN VANESA; CRISTALLINI ERNESTO; GHIGLIONE MATÍAS

Antofagasta

Congreso; XIII Congreso Geológico Chileno; 2012

Sociedad Geológica de Chile - SERNAGEOMIN

The models presented in this work were designed to simulate the development of an asymmetric rift system undergoing differential extension to study, the role of distinct factors controlling the final deformation pattern of the Austral Basin Fold-Thrust Belt. In particular, we intended to reproduce the structural settings of the studied region and to contrast the results with the inverted rift hypotheses suggested by previous studies. In agreement with the idea that similar variations found in the Patagonian fold-thrust belt coincide with ancient transfers zones between the depocenters, strong variations in width and lateral position of main thrusts during compressional stage of the model occurs near the induced transfer zone. Inversion of extensional structures show a geometry that is consistent with cross-sections from field and seismic data for the proposed study area.