Marion Le Voyer
Deep Carbon Observatory Fellow

Marion LeVoyer

Research Interests

Global cycling of volatiles in magmatic systems; degassing processes and eruption dynamics; melt inclusions, glasses, crystal zonation, and diffusion clocks; in situ analytical techniques, geochemical modeling, and stable isotopes.


B.S., Ecole Normale Supérieure – ENS Lyon, France, 2004 M.S., Laboratoire Magmas et Volcans, Blaise Pascal University, Clermont-Ferrand, France, 2006 Ph.D., Laboratoire Magmas et Volcans, Blaise Pascal University, Clermont-Ferrand, France, 2009

Contact & Links

  • (202) 478-8483 | fax: (202) 478-8821
  • mlevoyer at
  • Department of Terrestrial Magnetism
    Carnegie Institution of Washington
    5241 Broad Branch Road, NW
    Washington, DC 20015-1305
  • curriculum vitae


Marion Le Voyer
Credit: Marion Le Voyer, DTM

Marion Le Voyer’s research focuses on understanding the role of volatile elements in magmatic and geodynamic processes. She studies volatile element flux from the scale of a single crystal to the scale of the planet, using in situ techniques to assess elemental and isotopic variations in glasses, minerals, and melt inclusions.

During her Ph.D., Marion studied the deep volatile fluxes in three subduction zones with contrasting thermal regimes and slab geometry (Cascades, Ecuadorian and Italian Arcs). She used a combination of major, trace, volatile element concentrations, boron and/or lead isotopic compositions from melt inclusions to characterize the volatile exchanges between the subducting slab, the mantle wedge and the volcanic arc (Le Voyer et al., 2008; 2010; Rose-Koga et al., 2012). Each of these studies demonstrates that the nature of the deep volatile flux varies as a function of its formation process (dehydration vs. melting of the slab), strongly controls the composition of the resulting arc magmas, and creates mantle heterogeneities through metasomatism and recycling.

During her postdoctoral appointment at Caltech, Marion studied water loss from melt inclusions, by mapping volatile concentration gradients inside melt inclusions and around melt inclusions, in the host olivine (Mosenfelder et al., 2011; Le Voyer et al., in 2014; Newcombe et al., 2014). The matter of volatile conservation in melt inclusions is very important, as melt inclusions are commonly used to assess pre-eruptive volatile contents. She found that water loss occurred under very short timescales (less than a few hours), through hydrogen diffusion along preferential crystal orientation, following the “proton-polaron” mechanism. Results from these studies illustrate how rapidly volatiles in magmatic systems can reequilibrate. Such zonation can therefore provide timescales of very rapid processes happening just before or during eruption, with implications for the interpretation of monitoring data and the prevention of volcanic hazards.

As a Deep Carbon Observatory Fellow, Marion is currently working at DTM on the flux of carbon delivered to the Earth's surface through magmatism at mid-ocean ridges, using a global dataset of volatile contents from >600 MORB glasses. She also recently started a project on the volatile content of lunar magmas.