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Title: | Palaeoenvironments of the Late Miocene Prüedo Basin: implications for the uplift of the Central Pyrenees |
Author: | Ortuño Candela, María Martí i Castells, Anna Martín-Closas, Carles Jiménez-Moreno, Gonzalo Martinetto, E. Santanach i Prat, Pere F., 1946- |
Keywords: | Paleoclimatologia Miocè Pirineus Paleoclimatology Miocene Pyrenees |
Issue Date: | 4-Jan-2013 |
Publisher: | The Geological Society |
Abstract: | The nature, structure and extent of a palaeo-basin sedimentary infill exposed in the Aran valley (Central Pyrenees) was studied by combining stratigraphical and biostratigraphical analyses and an audio-magnetotelluric survey. The basin developed on top of a pre-existing peneplain and was formed by the North Maladeta Fault activity. The fluvio-palustrine sequence filling the basin was at least 100 m thick. Specimens of the taxon Hippuris cf. parvicarpa Nikitin were identified for the first time in a European palaeoflora. The palynological and carpological analyses allowed us to (1) constrain the age of the basin infill as Vallesian (11.1-8.7 Ma), (2) characterize the vegetation of the belt surrounding the basin as a mainly temperate to warm-temperate assemblage, and (3) estimate the palaeoaltitude of the site at between 700 and 1000 m, which leads to an altitude change of 900-1200 m for the North Maladeta Fault downthrown block and 1640-1640 m for the upthrown block. These data allowed us to estimate the regional uplift of the area at between 0.08 and 0.19 mm a−1. The different exhumation values obtained by other researchers for sites located at both sides of the North Maladeta Fault are in agreement with its activity as a normal fault since the Late Miocene. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1144/jgs2011-121 |
It is part of: | Journal of the Geological Society, 2013, vol. 170, p. 79-92 |
URI: | http://hdl.handle.net/2445/124796 |
Related resource: | https://doi.org/10.1144/jgs2011-121 |
ISSN: | 0016-7649 |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
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