IDEAN   23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The Agrio-Aluminé fold and thrust belt: a case of a curved belt in response to interaction with a pre-Andean foreland obstacle?
Autor/es:
EZEQUIEL GARCÍA MORABITO; DANIEL L. YAGUPSKY; MAXIMILIANO NAIPAUER; CARLA M. TERRIZZANO; VÍCTOR A. RAMOS
Lugar:
Antofagasta
Reunión:
Congreso; XIII Congreso Geológico Chileno; 2012
Institución organizadora:
Universidad Católica del Norte
Resumen:
The Agrio-Aluminé fold and thrust belt on the eastern fank of the Andes between 37º and 40º30?S shows a significant along-strike variation in width which defines a curved geometry. Diferential forelanward propagation of both portions delineates a wider northern portion (Chihuidos salient) and a narrower southern portion that becomes a recess (Laguna Blanca recess). Both sectors exhibit different degrees of exhumation, accompained by notable morphological, topographic, and structural changes. In the southern segment, the lateral growth of the FTB was inhibited by the presence of a pre-Andean east-west oriented regional feature known as the Huincul High. The combination of structural data and detrital zircon ages of its exposed protion, demostrates that the Huincul High was already uplifted by the time of inception of Andean deformation. Therefore, it would have acted as a transverse foreland obstacle that inhibited the lateral growth of the Andean belt, increasing uplift and deformation at its adjacent back zone. This setting suggest a higher pre-deformational sedimentary sequence involved in the Agrio FTB, and the interaction of the Aluminé FTB with the Huincul High, as first-order variables in originating a curved geometry of the FTB.