GEE team works on the geological consequences of the Earth’s water cycle.
When exposed at the Earth surface, rocks weather chemically under the action of water and atmospheric gases, leading to the release of solutes to aquifers and streams. Erosion simultaneously carves the Earth surface, thereby releasing sediments to rivers. These "pieces of continents" are then carried all the way to the oceans, where sediment deposits record their chemical composition. How fast do continents weather and erode? What are the climatic and tectonic factors that control these rates? How can we use sedimentary archives to retrieve such rates in the geological past? All these questions lie at the scientific core interests of the G2E team at the Institut de Physique du Globe de Paris; questions tightly linked to the past of our planet, but also to our present environment and to its future evolution.
Research at the G2E team hinges on Geochemistry - both elemental and isotope Geochemistry - as well as rock magnetism, applied to a large range of geological objects such as continental waters (soil-, ground-, and river water), river sediments, and sedimentary deposits. A specifity of GEE's approach is the focus on large river systems as "integrators" of Earth surface processes, overcoming spatial variability and providing insight at a relevant scale for geological questions.
The team members have access to a unique instrumental platform at IPGP comprising ICP and gas-source mass spectrometers, laser ablation devices, and clean labs to separate chemical elements from their matrix. "Non-traditional stable" isotopes (boron, lithium, magnesium, silicon, transition metals), radiogenic isotope systems (strontium, neodymium, lead, U-series) and noble gas cosmogenic isotopes constitute our "routine" toolbox to investigate processes in the external Earth, enhanced by the continuous development of new techniques.
G2E team members
Jérôme Gaillardet, professor IPGP, team leader
Julien Bouchez, CNRS junior researcher
Jean Louis Birck, CNRS emeritus
Catherine Chauvel, CNRS senior researcher
Céline Dessert, assistant-physicist
Eric Gayer, Assistant professor, Paris Diderot University
Fatim Hankard, contract engineer (IR-OZCAR)
Pascale Louvat, CNRS research engineer
Antoine Lucas, CNRS junior researcher
Laure Meynadier, Professor, Paris Diderot University
Claire Rollion-Bard, CNRS research engineer
Jean Sébastien Moquet (EMERGENCE project)
Xu Zhang (ISONOSE project)
Marie Küssner (ISONOSE project))
Quentin Charbonnier (Doctorate School)
Matthieu Buisson (Doctorate School)
Sara Milner (EarthBaseLine project)
Laeticia Faure, CNRS
Delphine Limmois, Paris Diderot University
Caroline Gorge, CNRS
Nicole Hernandez (Illinois University, Chateaubriand Grant).
- NEWS -
G2E team welcomes two new colleagues, Catherine Chauvel, CNRS senior researcher and Antoine Lucas, CNRS junior researcher appointed in both G2E and PPS teams.
22 september 2017 : Soufian Henchiri: "Les isotopes du lithium, traceurs de la Zone Critique de la Terre : du local au global"
27 september 2017 : Paul Floury: « La dynamique des bassins versants sous l’angle de l’analyse chimique haute fréquence des rivières » *