Thermochronological constraints of the exhumation and uplift of the Sierra de Pie de Palo,NW Argentina |
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| Institution: | 1. School of Geography, Geology & Environment, Kingston University, Penrhyn Road, Kingston upon Thames KT1 2EE, UK;2. Camborne School of Mines, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9FE, UK;3. Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK;4. Department of Earth and Planetary Sciences, Birkbeck College, Gower Street, London WC1E 7HX, UK;1. Institute of Geology, Leibniz University of Hannover, Callinstraße 30, 30167 Hannover, Germany;2. Department of Geoscience, University of Tübingen, Wilhelmstraße 56, 72074 Tübingen, Germany;3. Institute of Geology and Palaeontology, University of Münster, Corrensstraße 24, 48149 Münster, Germany;4. Dokuz Eylül University, Engineering Faculty, Department of Geological Engineering, T?naztepe Campus, Buca, 35160, Izmir, Turkey;5. University of Göttingen, Geoscience Center, Sedimentology and Environment Geology, Goldschmidstraße 3, 37077 Göttingen, Germany;6. Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK G23, 8093 Zurich, Switzerland |
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| Abstract: | The Sierra de Pie de Palo located between 67°30′–68°30′ W and 31°00′–32°00′ S in the Argentine Western Sierras Pampeanas in Argentina is a distinct basement range, which lacks thermochronological data deciphering its exhumation and uplift history below 200 °C. Integrated cooling histories constrained by apatite fission-track data as well as (U–Th)/He measurements of zircon and apatite reveal that the structural evolution of this mountain range commenced during the Late Paleozoic and was mainly controlled by tectonically triggered erosion. Following further erosional controlled exhumation in a more or less extensional regime during the Mesozoic, the modern topography was generated by denudation in the Paleogene during the early stage of the Andean deformation, whereupon deformation propagated towards the west since the Late Mesozoic to Paleogene. This evolution is characterised by a total of 3.7–4.2 km vertical rock uplift and by 1.7–2.2 km exhumation with a rate of 0.03–0.04 mm/a within the Sierra de Pie de Palo since ca. 60 Ma. Onset of uplift of peak level is also referred to that time resulting in a less Pliocene amount of uplift than previously assumed. |
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| Keywords: | Exhumation Uplift Thermochronology Sierra de Pie de Palo Argentina |
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