000005161 001__ 5161
000005161 005__ 20210122195558.0
000005161 0247_ $$2DOI$$ahttps://doi.org/10.2113/2020/8888588
000005161 037__ $$aSCART-2021-0029
000005161 100__ $$aArnous, Ahmad
000005161 245__ $$aNeotectonic Activity in the Low-Strain Broken Foreland (Santa Bárbara System) of the North-Western Argentinean Andes (26°S)
000005161 260__ $$c2020
000005161 520__ $$aUplift in the broken Andean foreland of the Argentine Santa Bárbara System (SBS) is associated with the contractional reactivation of basement anisotropies, similar to those reported from the thick-skinned Cretaceous-Eocene Laramide province of North America. Fault scarps, deformed Quaternary deposits and landforms, disrupted drainage patterns, and medium-sized earthquakes within the SBS suggest that movement along these structures may be a recurring phenomenon, with yet to be defined repeat intervals and rupture lengths. In contrast to the Subandes thrust belt farther north, where eastward-migrating deformation has generated a well-defined thrust front, the SBS records spatiotemporally disparate deformation along structures that are only known to the first order. We present herein the results of geomorphic desktop analyses, structural field observations, and 2D electrical resistivity tomography and seismic-refraction tomography surveys and an interpretation of seismic reflection profiles across suspected fault scarps in the sedimentary basins adjacent to the Candelaria Range (CR) basement uplift, in the south-central part of the SBS. Our analysis in the CR piedmont areas reveals consistency between the results of near-surface electrical resistivity and seismic-refraction tomography surveys, the locations of prominent fault scarps, and structural geometries at greater depth imaged by seismic reflection data. We suggest that this deformation is driven by deep-seated blind thrusting beneath the CR and associated regional warping, while shortening involving Mesozoic and Cenozoic sedimentary strata in the adjacent basins was accommodated by layer-parallel folding and flexural-slip faults that cut through Quaternary landforms and deposits at the surface.
000005161 594__ $$aNO
000005161 700__ $$aZeckra, Martin
000005161 700__ $$aVenerdini, Agostina
000005161 700__ $$aAlvarado, Patricia
000005161 700__ $$aArrowsmith, Ramon
000005161 700__ $$aGuillemoteau, Julien
000005161 700__ $$aLandgraf, Angela
000005161 700__ $$aGutierrez, Antonio
000005161 700__ $$aStrecker, Manfred
000005161 773__ $$c1-25$$n1$$pLithosphere$$v2020$$y2020
000005161 8560_ $$fmartin.zeckra@observatory.be
000005161 85642 $$ahttps://pubs.geoscienceworld.org/gsa/lithosphere/article/2020/1/8888588/591022
000005161 8564_ $$s5632566$$uhttp://publi2-as.oma.be/record/5161/files/Arnous et al. - 2020 - Neotectonic activity in the low-strain broken foreland (Santa Bárbara System) of the north-western Argentinean.pdf
000005161 8564_ $$s3343$$uhttp://publi2-as.oma.be/record/5161/files/Arnous et al. - 2020 - Neotectonic activity in the low-strain broken foreland (Santa Bárbara System) of the north-western Argentinean.gif?subformat=icon$$xicon
000005161 8564_ $$s4421$$uhttp://publi2-as.oma.be/record/5161/files/Arnous et al. - 2020 - Neotectonic activity in the low-strain broken foreland (Santa Bárbara System) of the north-western Argentinean.jpg?subformat=icon-180$$xicon-180
000005161 905__ $$apublished in
000005161 980__ $$aREFERD