External envelopes geochemistry | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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External envelopes geochemistry

 



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


Researchers

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


Post-doc

Jean Sébastien Moquet (EMERGENCE project)

PhD students

Xu Zhang (ISONOSE project)

Marie Küssner (ISONOSE project))

Quentin Charbonnier (Doctorate School)

Matthieu Buisson (Doctorate School)

Sara Milner (EarthBaseLine project)


Techical staff

Laeticia Faure, CNRS

Delphine Limmois, Paris Diderot University

Caroline Gorge, CNRS


Invited

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.


Defences

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 » *