@article{fdi:010090022, title = {{G}ravity-driven large-scale deformation system in the {T}umbes-{G}uayaquil forearc basin, {N}orthern {A}ndes ({N}orthern {P}eru-{S}outhern {E}cuador)}, author = {{P}euzin, {A}. and {S}aillard, {M}arianne and {E}spurt, {N}. and {M}ichaud, {F}. and {B}ulois, {C}. and {P}raeg, {D}. and {R}{\'e}gnier, {M}arc and {C}alderon, {Y}.}, editor = {}, language = {{ENG}}, abstract = {{T}he offshore {T}umbes-{G}uayaquil forearc basin in the accretionary prism of {N}orthern {P}eru-{S}outhern {E}cuador shows evidence of gravity-driven large-scale deformation systems active during the {L}ate {N}eogene-{Q}uaternary period. {S}ubsurface data and the construction of eight structural cross-sections show that the similar to 8 km-thick {O}ligocene-{Q}uaternary sedimentary infill is detached seaward and completely decoupled from the underlying inner accretionary prism systems. {T}he {C}orvina decollement in the {T}umbes basin and the {P}osorja decollement in the {G}uayaquil basin constitute two thin-skinned gravity tectonic systems associated with kilometer-scale, updip "raft" extensional structures paired with downdip fold-thrust systems ({B}arracuda and {D}omito thrust systems). {A}lthough many previous studies have described the structural and stratigraphic architecture of the {T}umbes-{G}uayaquil forearc basin, no model explicitly accounts for this anomalous large-scale gravity tectonics. {W}e propose that this gravity tectonic style, more commonly observed in passive continental margins, is primarily controlled by the combination of tectonostratigraphic features, including crustal-scale transtensional deformation related to oblique convergence along the {N}orthern {A}ndean margin, basal decollement slope tilting, strong sediment accumulation, and the presence of overpressured shales.}, keywords = {{G}ravity tectonics ; {H}igh sedimentation ; {O}verpressured shales ; {C}rustal deformation ; {N}orth {P}eru-{S}outh {E}cuador forearc ; {PEROU} ; {EQUATEUR}}, booktitle = {}, journal = {{J}ournal of {S}tructural {G}eology}, volume = {173}, numero = {}, pages = {104909 [11 ]}, ISSN = {0191-8141}, year = {2023}, DOI = {10.1016/j.jsg.2023.104909}, URL = {https://www.documentation.ird.fr/hor/fdi:010090022}, }