Chargé(e) de Recherche, CNRS
Équipe de Géochimie
Axes: Terre Primitive -
Chargée de recherche
Bureau: 1.48 - LMV Cezeaux
Courriel :

  • Research interests

    I use chemical and isotopic compositions (mainly Sm-Nd, Lu-Hf, Rb-Sr, and U-Th-Pb isotopic systems) of modern sediments or ancient sedimentary rocks to study the origin, composition, and evolution of the continents and the oceans through time.

    Detrital sediments and sedimentary rocks such as sandstone or shale are mixtures of mineral grains derived from the erosion of continents. I am interested in the chemical and isotopic signatures of these minerals because they record precious information on geological and sedimentary processes acting on continents as well as on the composition and the formation of crustal rocks.

    Chemical sedimentary rocks such as banded iron formation, carbonate, or chert that formed in seawater can trap complementary information on the composition of seawater, the oxygenation of the atmosphere and oceans, and the interactions between oceans and continents. In my research, I use chemical sedimentary rocks to better understand past environmental conditions at the beginning of Earth history.

    ​At the scale of the global sedimentary system, I am also interested in the recycling of sedimentary materials in subduction zones and the effects that such a process may have on the long-term evolution of the mantle and crust compositions.

    I am currently involved in several projects looking at ancient detrital and chemical sediments from different Archean cratons worldwide. Most of my current researches are however focused on banded iron formations as part of my ERC Starting grant project.


    Visit my personal website


  • ERC Stating grant GOforISOBIF (2020-2025)

    Since the beginning of Earth’s history, the oceans acted as an interface between the atmosphere, the continents, and the mantle via atmospheric exchange, weathering, sedimentation, and submarine volcanism. Such interactions make the composition of early seawater a unique recorder of the processes that have affected the Earth’s major reservoirs. Yet, this record has not been explored in details.

    Here, I propose to investigate the geochemistry of the first oceans that is recorded in Precambrian banded iron formations (BIFs) to address first-order questions related to the early evolution of our planet. The proposed project combines well-established radiogenic isotopic systems with novel and highly promising stable isotope tracers that will be developed as part of the project. These geochemical proxies will be measured on a unique collection of BIF samples deposited from ~3.8 to 0.7 Ga ago with the following objectives:

    (1) determine the origin, composition, and size of the first continents,

    (2) detect whiffs of oxygen in the early oceans in various depositional settings before and after the Great Oxidation Event (GOE),

    (3) identify the periods of intense hydrothermal activity through Earth’s history and link them to global mantle geodynamics.

    The proposed project will promote the application of state-of-the-art isotopic measurements, with an emphasis on further methodological development to set-up new isotope proxies. This innovative approach is needed to test previously suggested hypotheses, develop new ideas, and to tackle the challenging questions of the early Earth evolution from a different angle.



    Marion Garçon


    Quentin Aquila (2021 – 2024)
    Lukas Nicol (2021 – 2024)


    Pierre Bonnand (Postdoc, 2021 – present)


    Quentin Aquila (2020)


    Nicolas Olivier (LMV Clermont-Ferrand)
    Maud Boyet (LMV Clermont-Ferrand)
    Andrey Bekker (University of California, Riverside)




  • Current position

    2019 –                       Chargé de Recherche CNRS, Laboratoire Magmas et Volcans, Clermont-Ferrand, France


    Previous employments

    2016 –  2019            Ambizione Fellowship, ETH Zürich, Switzerland

    2015 –  2016            Auvergne Fellowship, Laboratoire Magmas et Volcans, Clermont-Ferrand, France

    2013 – 2015            Postdoctoral Fellowship, Carnegie Institution of Washington, USA

    2013                          Lab Engineer in Geochemistry, University of Grenoble, France



    2009 – 2012              PhD in Earth Sciences – Geochemistry, University of Grenoble, France – Advisor: Catherine Chauvel

    2007 – 2009              M.Sc. in Earth Sciences, University of Grenoble, France

    2004 – 2007              B.Sc. in Physics, major Physics and Chemistry, University of Grenoble, France



  • Publications LMV

    Rang A :
    • Saitoh M., Olivier N., Garçon M., Boyet M., Thomazo C., Alleon J., Moyen J.F., Motto-Ros, Marin-Carbonne J. (2022). Reply to comment on “Metamorphic origin of anastomosing and wavy laminas overprinting putative microbial deposits from the 3.22 Ga Moodies Group (Barberton Greenstone Belt)”. Precambrian Research vol.373, 106624, - DOI:10.1016/j.precamres.2022.106624 - lien HAL .

    • Boyet M., Garçon M., Arndt N., Carlson R.W., Konc Z. (2021). Residual liquid from deep magma ocean crystallization in the source of komatiites from the ICDP drill core in the Barberton Greenstone Belt. Geochimica et Cosmochimica Acta vol.304, p.141-159, - DOI:10.1016/j.gca.2021.04.020 - lien HAL .
    • Garçon M. (2021). Episodic growth of felsic continents in the past 3.7 Ga. Science Advances vol.7, - DOI:10.1126/sciadv.abj1807 - lien HAL .
    • Saitoh M., Olivier N., Garçon M., Boyet M., Thomazo Ch., Alleon J., Moyen J.F., Motto-Ros V., Marin-Carbonne J. (2021). Metamorphic origin of anastomosing and wavy laminas overprinting putative microbial deposits from the 3.22 Ga Moodies Group (Barberton Greenstone Belt). Precambrian Research vol.362, p.106306, - DOI:10.1016/j.precamres.2021.106306 - lien HAL .

    Rang B et C :
    • Garçon M. (2019). Crustal growth and composition: a new model based on the Nd-Hf isotopic composition of detrital sedimentary rocks. AGU Fall Meeting, V33B-04, San-Francisco, Etats-Unis, 9-13 decembre 2019.

    • Garçon M., Boyet M., Carlson R.W., Shirey S.B., Vance D. (2018). Using Archean sedimentary rocks from the Superior Province to decipher the crustal history and composition of the Canadian Shield. EGU, Vienna, Austria.

    • Boyet M., Bouvier A., Hammouda T., Garçon M. (2017). Nucleosynthetic anomalies in chondrites relative to the Earth: the debate over the 146Sm-142Nd systematics. Goldschmidt, Paris, France.
    • Garçon M., Boyet M., Carlson R.W., Shirey S.B., Horan M.F. (2017). 142Nd anomalies in Mid-to Late Archean sedimentary Rocks: Large scale recycling of Hadean crust?. Goldschmidt, Paris, France.

    Previous Publications:

    Boyet M., Bouvier A., Frossard P., Hammouda T., Garçon M., Gannoun A., Enstatite chondrites EL3 as building blocks for the Earth: the debate over the 146Sm-142Nd systematics. Earth and Planetary Science Letters, 488, 68-78. DOI: 10.1016/j.epsl.2018.02.004

    Henshall T., Cook D.L., Garçon M., Schönbächler M., High-precision Strontium isotope analysis of geological samples by thermal ionisation mass spectrometry. Chemical Geology, 482, 113-120. DOI: 10.1016/j.chemgeo.2018.02.010

    Horan M.F., Carlson R.W., Walker R.J., Jackson M., Garçon M., Norman M., Tracking Hadean processes in modern basalts with 142-Neodymium. Earth and Planetary Science Letters, 484, 184-191 (2018). DOI: 10.1016/j.epsl.2017.12.017

    Garçon M., Carlson R.W., Shirey S.B., Arndt N.T., Horan M.F., Mock T.D., Erosion of Archean continents: The Sm-Nd and Lu-Hf isotopic record of Barberton sedimentary rocks. Geochimica et Cosmochimica Acta, 206, 216-235 (2017). DOI: 10.1016/j.gca.2017.03.006

    Garçon M., Sauzéat L., Carlson R.W., Shirey S.B., Simon M., Balter V., Boyet M., Nitrile, Latex, Neoprene and Vinyl Gloves: A Primary Source of Contamination for Trace Element and Zn Isotopic Analyses in Geological and Biological Samples. Geostandards and Geoanalytical Research, 41, 3, 367-380 (2017). DOI: 10.1111/ggr.12161

    Sauzéat L., Rudnick R.L., Chauvel C., Garçon M., Tang M., New perspectives on the Li isotopic composition of the upper continental crust and its weathering signature (2015). Earth and Planetary Science Letters, 428, 181-192.

    Guillot S., Garçon M., Weinman B., Gajurel A., Tisserand D., France-Lanord C., Geen A., Chakraborty S., Huyghe P., Upreti B.N., Charlet L., Origin of Arsenic anomalies in Late Pleistocene to Holocene sediments in the Nawalparasi District (Terai, Nepal) (2015). Environmental Earth Sciences, doi: 10.1007/s12665-015-4277-y

    Garçon M., Chauvel C., Where is basalt in river sediments and why does it matters? (2014). Earth and Planetary Science Letters, 407, 61-69.

    Garçon M., Chauvel C., France-Lanord C., Limonta M., Garzanti E., Which minerals control Nd-Hf-Sr-Pb isotopic compositions of river sediments? (2014). Chemical Geology, 364, 42-55.

    Chauvel C., Garçon M., Bureau S., Besnault A., Jahn B.-M., Ding Z., Constraints from loess on the Hf-Nd isotopic composition of the upper continental crust (2014). Earth and Planetary Science Letters, 388, 48-58.

    Simonneau A., Chapron E., Garçon M., Winiarski T., Graz Y., Chauvel C., Debret M., Motellica-Heino M., Desmet M., Di Giovanni C., Tracking Holocene glacial and high-altitude alpine environments fluctuations from minerogenic and organic markers in proglacial lake sediments (Lake Blanc Huez, Western French Alps) (2014).Quaternary Science Reviews, 89, 27-43.

    Garçon M., Chauvel C., France-Lanord C., Limonta M., Garzanti E., Removing the “heavy mineral effect” to obtain a new Pb isotopic value for the upper crust (2013). Geochemistry Geophysics Geosystems, 14, 9, doi: 10.1002/ggge.20219

    Garçon M., Chauvel C., France-Lanord C., Huyghe P., Lave J., Sedimentary processes decouple Nd-Hf isotopes in river sediments on continents (2013). Geochimica et Cosmochimica Acta 121, 177-195.

    Garçon M., Chauvel C., Chapron E., Fain X., Lin M., Campillo S., Bureau S., Desmet M., Bailly-Maitre M.-C., Charlet L., Silver and lead in high-altitude lake sediments: Proxies for climate changes and human activities(2012). Applied Geochemistry, 27,3, 760-773

    Garçon M., Chauvel C., Bureau S. Beach placer, a proxy for the average Nd and Hf isotopic composition of a continental area (2011). Chemical Geology, 287, 3-4, 182-192

    Expedition 333 Scientists, including Garçon M.NanTroSEIZE Stage 2: subduction inputs 2 and heat flow. IODP Prel. Rept., 333(2011). doi:10.2204/


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