%0 Journal Article
%T A Review on Tectonic Record of Strain Buildup and Stress Release across the Andean Forearc along the Gulf of Guayaquil-Tumbes Basin (GGTB) near Ecuador-Peru Border
%A Jacques Bourgois
%J International Journal of Geosciences
%P 618-635
%@ 2156-8367
%D 2013
%I Scientific Research Publishing
%R 10.4236/ijg.2013.43057
%X <p align=\"justify\">
	<span style=\"font-family:verdana;\">Gravimetric and geologic data show that the reactivation of the Neogene Interandean depression and/or the ~75</span><span> </span><span style=\"font-family:verdana;\">-</span><span> </span><span style=\"font-family:verdana;\">65 Ma ophiolite suture into the modern dynamic of the Andes controlled the Gulf of Guayaquil Tumbes basin (GGTB) location and evolution during the past 1.8</span><span> </span><span style=\"font-family:verdana;\">-</span><span> </span><span style=\"font-family:verdana;\">1.6 Myr at least. Depending on whether the remobilization occurred along the </span><span style=\"font-family:verdana;\">i</span><span style=\"font-family:verdana;\">n</span><span><span style=\"font-family:Verdana;\">terandean depression or the ophiolite suture, the GGTB evolved trough pure or simple shear mechanisms, respectively. Because the GGTB exhibits an along strike tectonic asymmetry associated with a pervasive seismic gap, the simple shear solution is more likely. Tectonic inversion occurred along a mid-crust detachment (the Mid-Crust detachment hereafter) matching the ophiolite suture that accommodates the North Andean Block (NAB) northward drift. The so-called Decoupling Strip located at the shelf slope break accommodated the tensional stress rotation from N-S along the shelf area </span><i><span style=\"font-family:Verdana;\">i.e</span></i><span style=\"font-family:Verdana;\">. NAB-drift induced</span></span><span> </span><span><span style=\"font-family:Verdana;\">to E-W along the continental margin </span><i><span style=\"font-family:Verdana;\">i.e</span></i><span style=\"font-family:Verdana;\">. subduction-erosion-induced. The land</span></span><span style=\"font-family:verdana;\">ward dipping Woollard detachment system located at the Upper-Lower slope boundary connects the subduction channel at depth, allowing the Upper slope to evolve independently from the Lower slope wedge. The long-term recurrence in</span><span><span style=\"font-family:Verdana;\">terval between earthquakes, the strong interplate coupling, and the aseismic creeping deformation acting along the main low-angle detachments </span><i><span style=\"font-family:Verdana;\">i.e</span></i><span style=\"font-family:Verdana;\">. the Woollard and the Mid-Crust detachments may account for the pervasive seismic gap at the GGTB area. Because the subduction channel exhibits no record of significant seismic activity, no evidence exists to establish a link between the GGTB sustained subsidence and a basin-centered asperity. Because the
%K Andean Forearc
%K Strain Buildup
%K Stress Release
%K Gulf of Guayaquil-Tumbes Basin
%K Ecuador
%K Peru
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=31774