%0 Journal Article
%T Deformaci¨®n compresiva cuaternaria en la Cordillera Principal de Chile central (Caj¨®n del Maipo, este de Santiago)
%A Lavenu
%A Alain
%A Cembrano
%A Jos¨¦
%J Revista geol¨®gica de Chile
%D 2008
%I Scientific Electronic Library Online
%R 10.4067/S0716-02082008000200003
%X a detailed study of recent sediments in the maipo river valley (caj¨®n del maipo), east of santiago, shows a compressive deformation documented by coeval reverse faults and drag-folds. these structures are characteristic of a principal stress direction trending roughly n-s (n338ˇăe) that also affects the older sediments of the abanico formation constituting the bedrock of the quaternary alluvial terraces. two deformation episodes are superposed in the bedrock: a neogene deformation event (post 9 ma), having an e-w-trending al, and a late quaternary event with al roughly trending n-s. the latter would be the result of regional-scale partitioning of the oblique convergence vector between the nazca and south american plates; a buttress at 33ˇăs would produce a north-south velocity gradient in the forearc leading to regional, north-south shortening. shallow crustal seismicity in the inner forearc (main cordillera) is -at least in part- compatible with the compression direction as obtained from the kinematic analysis of mesoscopic fault-slip data.
%K forearc
%K neotectonics
%K strain
%K stress
%K quaternary
%K central chile
%K andes.
%U http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0716-02082008000200003&lng=en&nrm=iso&tlng=en