Science and Technology Production
Congress
Authorship
Date
2024
Publishing House and Editing Place
INQUA
Summary
Information provided by the agent in
SIGEVA
At the southern Pampean flat-slab of the Central Andes, the active deformation zone is located at the easternmost thrusts of the Southern Precordillera along the Las Higueras-Las Peñas range (32° 10?-32° 45? S). This range is bounded by the Las Peñas Thrust System (LPTS), which juxtaposes Cenozoic sedimentary rocks over a suite of Quaternary alluvial deposits showcasing variable shortening rates. This study is focused on the southern part of this range -La Escondida Creek-...
At the southern Pampean flat-slab of the Central Andes, the active deformation zone is located at the easternmost thrusts of the Southern Precordillera along the Las Higueras-Las Peñas range (32° 10?-32° 45? S). This range is bounded by the Las Peñas Thrust System (LPTS), which juxtaposes Cenozoic sedimentary rocks over a suite of Quaternary alluvial deposits showcasing variable shortening rates. This study is focused on the southern part of this range -La Escondida Creek-, where the Quaternary thrust front migration affects Neogene and Pleistocene strata. We estimated shortening values by retrodeforming trishear models constructed from alluvial surfaces, which served as geometric markers of deformation for propagating structures in the piedmont. Dip-slip rates were estimated ranging from 0.90mm/yr and 1.79mm/yr for the last ∼12 and 3 ka, respectively.
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Key Words
shortening estimationsTrishear modellingLas Peñas Thrust System, foot-wall splaysSouthern Precordillera Argentina