IDEAN   23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Salient and recess development in the Agrio - Aluminé fold and thrust belt. Influence of a pre-Andean foreland obstacle.
Autor/es:
YAGUSPKY, D.L.; GARCÍA MORABITO EZEQUIEL; NAIPAUER, M.; TERRIZZANO, C.M.; CRISTALLI, E. O.; RAMOS, V.A.
Lugar:
Viña del Mar
Reunión:
Congreso; International Geological Congress on the Southern Hemisphere; 2013
Institución organizadora:
Universidad Andrés Bello
Resumen:
Between 37º and 40º30´S a differential propagation of the deformation towards the foreland delineates a curving fold and thrust belt. Along-strike variation in width is accompanied by significant latitudinal morphological, topographic, and structural changes. Structural data and detrital zircon ages from the exposed portion of the Huincul High confirm that this E-W feature was already uplifted by the time of inception of the Andean deformation. This structural setting is supported by analogue models, suggesting the following two factors as the origin of the curved geometry of the Agrio-Aluminé fold and thrust belt: 1) a higher pre-deformational sedimentary sequence involved in the Agrio FTB generated the Chiuhuidos salient; and 2) the interaction of the Aluminé FTB with the Huincul High induced the Laguna Blanca recess. Therefore, the Huincul High would have acted as a transverse foreland obstacle that inhibited the forward growth of the Andean belt, increasing the deformation and uplift in a narrow region where the two system interacted.