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http://hdl.handle.net/2445/171754
Title: | Quantifying deformation processes in the SE Pyrenees using U-Pb dating of fracture-filling calcites |
Author: | Cruset Segura, David Vergés i Masip, Jaume Albert, Richard Gerdes, Axel Benedicto Esteban, Antonio Cantero, Irene Travé i Herrero, Anna |
Keywords: | Calcita Falles (Geologia) Pirineus Calcite Faults (Geology) Pyrenees |
Issue Date: | 7-Sep-2020 |
Publisher: | The Geological Society |
Abstract: | It is difficult to quantify the timing of the deformation processes in brittle fold-thrust belts because minerals suitable for dating and well-preserved growth strata sediments are scarce or absent. Here, we quantify the duration of thrust sheet emplacement and shortening rates in the SE Pyrenean thrust sequence using U-Pb dating of fracture-filling calcites. The obtained U-Pb dates reveal a minimum duration for the emplacement of each thrust unit (18.7 Ma for the Bóixols-Upper Pedraforca, 11.6 Ma for the Lower Pedraforca and 14.3 Ma for the Cadí thrust sheets) and show that piggy-back thrusting was accompanied by post-emplacement deformation of the upper thrust sheets above the lower sheets during their south-directed tectonic transport. We calculated shortening rates of 0.6, 3.1 and 1.1 mm a−1 from the older to younger emplaced thrust sheets. Our results also reveal the formation of local normal faults during the late Oligocene as a result of the late stages of compression and exhumation in the SE Pyrenees. We observed that temperatures >110 °C could be a limiting factor when applying the U-Pb dating method. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1144/jgs2020-014 |
It is part of: | Journal of the Geological Society, 2020, vol. 177, p. 1186-1196 |
URI: | http://hdl.handle.net/2445/171754 |
Related resource: | https://doi.org/10.1144/jgs2020-014 |
ISSN: | 0016-7649 |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
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704226.pdf | 2.79 MB | Adobe PDF | View/Open |
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