%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Lavenu, Alain
%A Cembrano, J.
%T Deformación compresiva cuaternaria en la Cordillera Principal de Chile central (Cajón del Maipo, este de Santiago) = Quaternary compressional deformation in the Main Cordillera of Central Chile (Cajon del Maipo, east of Santiago)
%D 2008
%L fdi:010042737
%G SPA
%J Revista Geologica de Chile
%@ 0716-0208
%K Forearc ; Neotectonics ; Strain ; Stress ; Quaternaty ; Central chile ; Andes
%M ISI:000257954600003
%N 2
%P 233-252
%R 10.4067/S0716-02082008000200003
%U https://www.documentation.ird.fr/hor/fdi:010042737
%> https://www.documentation.ird.fr/intranet/publi/2008/08/010042737.pdf
%V 35
%W Horizon (IRD)
%X A detailed study of recent sediments in the Maipo River Valley (Cajon 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 (N338 degrees E) 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 sigma 1, and a late Quaternary event with sigma 1 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 33 degrees S 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.
%$ 064