Actas - Assessing Late Quaternary shortening related to footwall splays at the southern section of Las Peñas Thrust System , Southern Precordillera, Argentina.

Producción CyT

Congreso

Autoría

SAGRIPANTI, LUCIA

Fecha

2024

Editorial y Lugar de Edición

INQUA

Resumen Información suministrada por el agente en 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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shortening estimationsTrishear modellingLas Peñas Thrust System, foot-wall splaysSouthern Precordillera Argentina