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Article Dans Une Revue Bulletin de la Société Géologique de France Année : 2018

Geo-thermochronology of the Saint Antonin basin, south-eastern France

Résumé

The clastic sedimentary formations of the Saint Antonin basin in the French Maritime Alps contain the record of the Early Oligocene erosional history of the Maures-Esterel massif, Sardinia and Corsica. Detrital apatite fission-track dating and zircon fission-track/U-Pb double dating of samples collected from the Saint Antonin basin confirm sediment provenance and allow obtaining first-order estimates of drainage basin maximum and long-term average exhumation rates. Whereas average exhumation rates were on the order of 0.1–0.2 km/Myr during the Early Oligocene, small parts of the Saint Antonin basin source areas may have experienced maximum exhumation rates on the order of 0.4–0.7 km/Myr. Although zircons and apatites with Early Oligocene fission-track cooling ages make up between 11–15% of the dated grains, a possible volcanic contribution is negligible, as only one single volcanic zircon grain was identified by fission-track/U-Pb double dating. Regional geodynamic processes with convergence in the Western Alps to the east and the end of the Pyreneo-Provençal compression phase by the early Oligocene controlled the differences in basin fill history and sediment provenance between the Saint Antonin basin and the largely contemporaneous Barrême basin in southeastern France.

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Géochimie
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hal-01876953 , version 1 (20-01-2021)

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Sebastien Jourdan, Matthias Bernet, Elizabeth Hardwick, Jean-Louis Paquette, Pierre Tricart, et al.. Geo-thermochronology of the Saint Antonin basin, south-eastern France. Bulletin de la Société Géologique de France, 2018, 189 (3), ⟨10.1051/bsgf/2018013⟩. ⟨hal-01876953⟩
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