Science and Technology Production

25th Latin-American Colloquium of Geosciences - Interplay between constructive deep mechanisms building the Central Andes and the stress field

Congress

Authorship:

Giambiagi, L. ; Spagnotto, Silvana ; Tassara, A. ; Suriano, Julieta ; Mescua, J. ; Lossada, A.C. ; BARRIONUEVO, MATÍAS ; Julve, Joaquín

Date:

2019

Publishing House and Editing Place:

TERRA NOSTRA

Summary *

Both in continental collision and subduction-related orogens, different kinds of mega-detachments have been proposed to explain the horizontal shortening, crustal thickening and topographic uplift. In fold-and-thrustbelts, these detachments have traditionally been located inside levels of mechanical anisotropies. These orogenic wedges thicken towards the hinterland, reaching depths located in the brittle-ductile transition. At an orogenic scale, these shear zones are not controlled by frictional sliding, but rather by temperature, composition, strain rate, and the stress field. While the synergies between crustal deformation, exhumation and sedimentation processes are well-known to a first order, it is challenging to evaluate the interplay between constructive deep mechanisms and the in-situ stress field. Two outstanding questions in the study of orogenic processes are: How does shallow structures in the foreland fold-and-thrust belt connect with ones in the hinterland under an evolving and changing stress field? How long can a detachment remain active during an orogenic event? Information provided by the agent in SIGEVA

Key Words

stress fieldTectonicsAndes