This work investigates the long-term tectonic evolution of the Western Alpine foreland and the interactions between deformation, fluid circulation, and crustal-scale geodynamic processes in peri-orogenic domains. Combining structural geology, paleostress reconstruction, in-situ U–Pb carbonate geochronology, and 3D geological modeling, the study aims to better constrain the timing, propagation, and reactivation of brittle deformation from the Mesozoic to the present day in SE France and the Western Alps. Particular emphasis is placed on the direct dating of fault-related carbonates through the development and application of in-situ calcite U–Pb geochronology at the ISTerre laboratory. The integration of geochronological, structural, and geophysical datasets highlights the complex succession of extensional, compressional, and strike-slip tectonic phases affecting both sedimentary cover units and the crystalline basement, while providing new insights into the role of crustal inheritance and lithospheric-scale controls on deformation localization.

Organic ma*er is expected to be a key component of bodies formed in the outer regions of planetary systems. In the Solar System, measured moments of iner=a, interpreted with equa=ons of state for ices, silicates, and carbonaceous materials, suggest that organics may cons=tute a major frac=on of the refractory interiors of several icy bodies (e.g., Reynard & So=n, 2023; Delarue et al., 2026). Organics may therefore exert a first-order control on thermochemical evolu=on and vola=le produc=on—an idea that is par=cularly =mely given the growing popula=on of low-density exoplanets. The presenta=on will summarize recent work aiming at (i) predic=ng the occurrence of organic-rich vola=le worlds from host-star elemental abundances, and (ii) quan=fying the impact of carbon/organics on thermochemical evolu=on. On the occurrence side, stellar abundance pa*erns are used to iden=fy systems in which the available refractory and vola=le budgets favor carbonrich/organic-rich condensates beyond the relevant condensa=on fronts. On the interior side, evolu=on is modeled by combining equa=ons of state for ices, silicates and carbonaceous materials with kine=c descrip=ons of the transforma=on of a representa=ve organic compound as a func=on of =me and temperature. The kine=c scheme tracks the progressive loss of H and heteroatoms from the carbonaceous phase, the associated increase in residual carbon density toward graphite-like values, and the produc=on of mobile vola=les. These processes feed back on the thermal history and set the =me-dependent inventories of poten=ally releasable species. Model outputs are used to quan=fy expected vola=le release for Titan-like bodies and carbon-rich exoplanets, and to contrast these outcomes with classical telluric and ice–silicate evolu=on pathways. Implica=ons for JWST-era characteriza=on of low-density planets, and for joint constraints from mass–radius measurements, stellar abundances, and interior evolu=on models, are discussed.

Current research highlights chemical weathering of mafic and ultramafic rocks in tropical arc-continent collisions as an important mechanism for atmospheric CO2 removal, while the impacts of physical erosion remain insufficiently explored. In tropical arc-continent collision zones, intense precipitation associated with monsoons and tropical cyclones drives high sediment discharge from steep mountain rivers. These processes have can simultaneously enhance carbon sequestration via burial of terrestrial organic matter and provide bioessential nutrients to stimulate marine productivity; yet their net effect on carbon cycling remains poorly defined. This knowledge gap is particularly significant at active continental margins, where steep topography, narrow shelves, and submarine canyons create highly efficient routes for transferring carbon to the deep sea. To understand the role of arc-continent collisions and changes in carbon stored in the sediment of the adjacent basins, we incorporate facies-based paleoenvironmental reconstructions and geochemical investigation of the Taiwan Western Foreland Basin and the northern South China Sea. Analysis of organic carbon in rock and sediment samples shows that the total organic carbon content (TOC) in the northern South China Sea is closely related to mass accumulation rate, suggesting that organic carbon preserved in the marine sediment is linked to terrestrial erosion. Along the lower continental slope, the mass accumulation rate, TOC, and δ 13Corg shows no correlation to the uplift and erosion of sediment from Taiwan. Here, sediment and carbon are largely derived from Eurasia, and their accumulation is controlled by long-term sea-level fluctuations. In contrast, on the lower continental rise, mass accumulation rate and TOC abruptly increase at the onset of Taiwan’s emergence from the Pacific Ocean, and the increases are likely related to increased sediment erosion and export from Taiwan. The δ 13Corg values show an increase in marine organic carbon as the uplift and erosion of Taiwan increased, which suggests that sediment flux from Taiwan was able to trigger primary production in the open sea. Our findings demonstrate that arc–continent collision influences carbon sequestration through two pathways: (1) direct burial of terrestrial organic matter eroded by enhanced precipitation, and (2) export of bioessential nutrients that stimulate marine productivity. This work establishes a direct link between the erosion of an arccontinent collision and long-term carbon burial in adjacent ocean basins.

Andean Iron oxide copper-gold (IOCG) deposits and Iron oxide-apatite (IOA) form part of the Andean Iron Belt which extends from central Peru to central Chile that hosts world class deposits. The genetic relationship between these two deposit types has mostly been conceived as a vertical one; one fluid that evolves from deeper higher temperature environments to shallower ones. Here we show a new model that relates both deposit types as an evolving system through time more than space using mineral chemistry, sulfur isotopes, zircon chemistry and mineral paragenesis.

In this webinar you learn:
* what are the principles that count for maintenance close to the natural state
* when is the right time to mow – and when to let nature take its course
* which tools are useful and why less technology often means better results
* how to establish a maintenance plan adapted to your surface and compatible with your daily life