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Accueil du site > Thèmes/Research > Tectonics, Erosion and Relief Evolution > Tectonic/topography/erosion/climate couplings

Tectonic/topography/erosion/climate couplings

For almost two decades, the Earth sciences have seen the emergence of the concept of the coupled system to describe the evolution of continental surfaces and that of orogens. There are numerous feedback loops characterising the land surface, and it is sometimes difficult to deconvolute the study of a natural system. Moreover, the effectiveness, the amplitude, and the exact roles of these couplings in the evolution of an orogen, current or past, are still poorly understood. Progress on these issues require the determination of the physico-chemical laws governing the landscape evolution, the tectonic evolution of continental orogens and the history of the mass transfer derived from records of sediment accumulation rates in the basins and paleo-rates of erosion on the reliefs. The success of this approach relies on the precision with which erosion and sedimentation events can be dated (via magnetostratigraphy or cosmogenic nuclides) in regards to the chronology of tectonic and climatic events. Characterisation of the history of large-scale mass transfer is usually conducted by reconstructing the volumes of sediment stored in basin. Because this approach relies on many strong assumption, we propose to provide independent constraints to characterise the history of erosion by focusing on the LT detrital thermochronology or the analysis of cosmogenic isotopes in the foreland basins in series well dated by magnetostratigraphy.