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Deciphering coastlines with a new Rosetta Stone: climatic, tectonic and environmental evolution of the Gulf of Corinth
Gino De Gelder  1@  , Navid Hedjazian  2@  , Laurent Husson  3@  , Thomas Bodin  4@  , Anne-Morwenn Pastier  5@  , Yannick Boucharat  3  , Kevin Pedoja  6  , Tubagus Solihuddin  7  , Sri Yudawati Cahyarini  7  
1 : ISTerre
ISTerre, Université Grenoble Alpes, Université Savoie Mont-Blanc, CNRS, IRD, Université Gustave Eiffel, Grenoble, France
2 : Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
Université Lyon 1, UMR 5276 du CNRS, Laboratoire de géologie de Lyon: Terre, Planètes, Environnement
3 : Institut des Sciences de la Terre
Institut de Recherche pour le Développement, Institut National des Sciences de l'Univers, Université Savoie Mont Blanc, Centre National de la Recherche Scientifique, Université Gustave Eiffel, observatoire des sciences de l'univers de Grenoble, Université Grenoble Alpes
4 : Institute of Marine Sciences / Institut de Ciències del Mar [Barcelona]
5 : German Research Centre for Geosciences - Helmholtz-Centre Potsdam
6 : Université de Caen Normandie
Normandie Université
7 : National Research and Innovation Agency

The world's coastlines provide an extensive archive to reconstruct past sea level, tectonic processes and environmental conditions. Traditional approaches often struggle to resolve these factors independently, limiting our ability to interpret the various processes that shaped a coastline. In this study, we present a novel Bayesian inversion method that utilizes the geomorphology of marine terraces to simultaneously infer past sea-level, uplift rates and hydrodynamic factors. After benchmarking the model, we test the power of our method on the particularly complex Gulf of Corinth, where tectonically uplifting and subsiding hydrological sills have periodically (dis-)connected the Gulf from the open sea over the past ~450 ka. Our results reveal how eustatic sea-level changes, tectonic uplift/subsidence, and local climatic fluctuations have governed the basin's transitions between marine, overfilled lacustrine, and underfiled lacustrine phases. This study demonstrates the potential of inverting coastlines to untangle the climatic and tectonic processes that dictated their formation.


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