Active basement uplift of Sierra Pie de Palo (Northwestern Argentina): Rates and inception from10Be cosmogenic nuclide concentrations

摘要: Quaternary tectonic and denudation rates are investigated for an actively growing basement anticline: the Sierra Pie de Palo range, which belongs to Andean foreland of Northwestern Argentina (28°S–33°S). In this study, a detailed morphometric analysis topography is combined with in situ-produced cosmogenic10Be concentrations measured (1) surface boulders abandoned on alluvial terraces affected by fault activity (along north bounding fault) growth fold southeastern border), (2) bedrock outcrops corresponding exhumed folded, regional erosion surface, (3) fluvial sediments sampled at outlets several watersheds. Along eastern northern borders incision uplift have been estimated approximately 0.5 1 mm/yr when integrated Holocene Pleistocene time scales, close agreement both long-term (structural basin evolution data) short-term (GPS-derived velocity field) analyses. Cosmogenic-derived geomorphic characteristics watersheds river channels allows estimating onset 4–6 Ma, followed more recent period topographic rejuvenation roughly 1–2 Ma, probably synchronous steepening flanks anticline.