Articles | Volume 12, issue 1
https://doi.org/10.5194/se-12-237-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-12-237-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Jan 2021
Research article |
| 28 Jan 2021
| 28 Jan 2021
Extensional reactivation of the Penninic frontal thrust 3 Myr ago as evidenced by U–Pb dating on calcite in fault zone cataclasite
Antonin Bilau
CORRESPONDING AUTHOR
EDYTEM, Université Savoie Mont Blanc, CNRS, UMR 5204, 73370 Le Bourget-du-Lac, France
ISTerre, Université Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, 38000 Grenoble, France
Yann Rolland
CORRESPONDING AUTHOR
EDYTEM, Université Savoie Mont Blanc, CNRS, UMR 5204, 73370 Le Bourget-du-Lac, France
ISTerre, Université Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, 38000 Grenoble, France
Stéphane Schwartz
ISTerre, Université Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, 38000 Grenoble, France
Nicolas Godeau
Aix-Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, 13545 Aix-en-Provence, France
Abel Guihou
Aix-Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, 13545 Aix-en-Provence, France
Pierre Deschamps
Aix-Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, 13545 Aix-en-Provence, France
Benjamin Brigaud
GEOPS, CNRS, Université Paris-Saclay, 91405 Orsay, France
Aurélie Noret
GEOPS, CNRS, Université Paris-Saclay, 91405 Orsay, France
Thierry Dumont
ISTerre, Université Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, 38000 Grenoble, France
Cécile Gautheron
GEOPS, CNRS, Université Paris-Saclay, 91405 Orsay, France
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Lake Mareotis (NW Nile delta, Egypt) was a gateway between the Nile valley and the Mediterranean during Greco-Roman times. The hydrological evolution of Lake Mareotis was reconstructed using lake sediments and archaeological archives. The data show both a rise in Nile inputs to the basin during the first millennia BC and AD and a lake-level rise of ca. 1.5 m during the Roman period. A high-energy deposit such as a tsunami also possibly affected Alexandria's lacustrine hinterland.
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Short summary
As a result of the collision between the European and Apulian plates, the Alps have experienced several evolutionary stages. The Penninic frontal thrust (PFT) (major thrust) was associated with compression, and now seismic studies show ongoing extensional activity. Calcite mineralization associated with shortening and extensional structures was sampled. The last deformation stages are dated by U–Pb on calcite at ~ 3.5 and ~ 2.5 Ma. Isotope analysis evidences deep crustal fluid mobilization.
As a result of the collision between the European and Apulian plates, the Alps have experienced...
