Centre de Recherche et d’Enseignement de Géosciences de l’Environnement

Redox Transformation of Platinum Mediated by Natural Organic Matter Revealed by X-ray Absorption Spectroscopy

Abstract Platinum (Pt) is an emerging environmental contaminant due to its increasing anthropogenic use, yet the processes controlling its speciation remain poorly understood. Here, we investigate Pt redox transformations in the presence of natural organic matter (NOM) using X-ra...

Adapting Mediterranean forests to climate change by testing alternative species: Insights from recent planting trials across an elevational gradient in southeastern France

To adapt Mediterranean forests to climate change-induced disturbances—such as severe droughts and temperature extremes—introducing "alternative" tree species whose field performance remains poorly tested is a critical management option. This study evaluated the early survival and...

Magnetic insights into the aqueous alteration of CM chondrites

CM chondrites are the archetypal group of aqueously altered meteorites, preserving records of water-rock interactions on planetesimals. Here, we couple rock magnetic properties with modal mineralogy measured from 48 CM chondrites to explore aqueous alteration through its influenc...

A Causal Examination of the Solar Influence on Holocene Climate

Abstract Variations in Total Solar Irradiance (TSI) have long been hypothesized to influence global mean surface temperature (GMST) on multidecadal to millennial timescales, but empirical evidence has remained elusive. Here, we explore the link between solar variability and clima...

Identification of living (Rose Bengal)-stained benthic foraminifera using automated image recognition

Abstract. Living and fossil benthic foraminifera are widely used as bioindicators of ecosystem quality, but their analysis is time-consuming. With the help of artificial intelligence, models for the automatic identification of fossil planktonic foraminifera and, more recently, be...

Iron Isotopes Reveal Fe Export Driven by Change of Tropical Weathering Regime

Abstract Unraveling paleoenvironmental signals recorded in laterites is crucial for quantifying weathering‐driven elemental fluxes at the Earth's surface. New stable iron isotope data (δ 56 Fe), combined with (U‐Th)/He ages in Fe‐oxides from a ferruginous duricrust from French Gu...

Planktonic foraminifera iodine ∕ calcium ratio: is it a proxy for dissolved oxygen in the ocean?

Abstract. Direct observations indicate a declining trend in ocean oxygen concentrations, which is not quantitatively captured by models. The complexity of oxygenation variability, linked to both physical and biochemical parameters, must be investigated across different modern cli...