Juliette RAT

Evolution du contenu détritique au cours d’un cycle orogénique

Supervisor:
Frédéric Mouthereau and Stéphanie Brichau
GET-OMP, Toulouse

Major Results

The Iberian Chain formed in central Iberia at ca. 60 Ma and recorded exhumation at 35-25 Ma. The transition between extensional events relate to the Altantic and Alpine Tethys is well recorded by LT data. Detrital thermochronology help tracking sediments transport from the time of late Jurassic extension to the last Cenozoic sink.

Abstract

We have focused on an inverted Mesozoic rift basin, the Cameros basin, which is part of the Iberian chain. ZFT analyses of Oligocene–Miocene sedimentary rocks yield two main age populations at ~170 ± 10 and ~100 ± 10 Ma, reﬂecting (i) an Early Jurassic thermal event related to the Atlantic‐Alpine Tethys opening and (ii) an Albo‐Cenomanian thermal event related to the Bay of Biscay opening. Thermal modeling of combined ZFT, AFT, and A(U‐Th‐Sm)/He data reveals that collision‐related cooling started during the Paleocene (~60 Ma).

A second cooling/exhumation phase of the basin is recorded from 35 to 25 Ma. Initial cooling occurred after a protracted postrift period characterized by persistence of high geothermal gradients, a feature also recognized in the Pyrenees. Our results show that the Iberian chain shared the same Early to Late Jurassic tectonothermal evolution with the Atlantic‐Alpine Tethyan rifted margins. From the Albian onward, the thermal evolution of the Cameros basin was very similar to that of the Pyrenees. This study shows that the preservation in mountain ranges of a succession of rifting events provide important clues for plate reconstructions.

PhD Thesis: Évolution du contenu détritique sédimentaire au cours d’un cycle orogénique.

Juliette Rat. Évolution du contenu détritique sédimentaire au cours d’un cycle orogénique. Sciences de la Terre. Université Toulouse III Paul Sabatier (UT3 Paul Sabatier), 2019. Français. ⟨tel-02167789

keywords: Ibérie, Thermochronologie, Cycle alpin, Bassin sédimentaire, Sources to Sink

DOI: https://tel.archives-ouvertes.fr/tel-02167789/document

Tectonothermal Evolution of the Cameros Basin: Implications for Tectonics of North Iberia

Rat, J., Mouthereau, F., Brichau, S., Crémades, A., Bernet, M., Balvay, M., Ganne, J., Lahfid, A., Gautheron, C. (2019). Tectonothermal Evolution of the Cameros Basin: Implications for Tectonics of North Iberia Tectonics 40(3), 327.

keywords: Cameros basin, Iberian‐Europe plate boundary, rift‐collision cycles, Ebro basin, low‐temperature thermochronology, rift thermal imprint

DOI: https://dx.doi.org/10.1029/2018tc005294