Periodic Reporting for period 3 - VOLATILIS (Origin of volatile elements in the inner Solar System)
Reporting period: 2020-02-01 to 2021-07-31
Boulliung et al. (GCA, 2021) performed N equilibration experiments on various silicate melt compositions over a wide range of oxygen fugacities to better understand the incorporation mechanism(s) of N in silicate melts, and to synthesize new calibrants for N analyses by SIMS. Boulliung et al. (Am. Mineral., 2021) investigated N diffusion in silicate melts under reducing conditions.
Deligny et al. (GCA, in press) investigated the N and H isotopic signature of angrite melts by SIMS analyses of mineral-hosted melt inclusions and interstitial glass in the angrite meteorites D'Orbigny and Sahara 99555 to constrain the source(s) and timing of volatile delivery to planetary bodies in the inner Solar System.
Dalou et al. (PNAS, 2019) experimentally determined N isotopic fractionation during metal-silicate partitioning (analogous to planetary core formation) to better understand how planetary differentiation processes may have modified the N isotopic composition of the proto-Earth.
Füri et al. (Chem. Geol., 2021) determined the N content of olivine-hosted melt inclusions from Klyuchevskoy volcano (Kamchatka) by SIMS to improve our understanding of the behavior and fate of N at subduction zones.
In parallel, the PI has continued her research on lunar volatiles by studying i) the He-Ne-Ar abundance and isotopic composition of single Apollo 15426 green glasses (GPL, 2018), the deuterium content and noble gas (He-Ne-Ar) characteristics of nominally anhydrous mineral (olivine and pyroxene) grains and rock fragments, respectively, from different depths within Apollo olivine basalt 12018 (EPSL, 2020), and iii) the noble gas exposure ages of samples from Cone and North Ray craters (under review).
In addition, the PI was contributed to two review articles, which summarize our current knowledge of the origin of terrestrial carbon (Mikhail and Füri, Elements, 2019) and of the chemical and isotopic evolution of the early Solar System (Bermingham et al., Space Sci. Rev., 2020).
We have equipped the existing experimental petrology facility at the CRPG with a hydrothermal diamond anvil cell (HDAC) for in situ Raman spectroscopic studies of nitrogen-rich aqueous fluids, silicate melts, and minerals at high pressures (up to 30 GPa) and temperatures (up to 1000ºC). A first series of experimental tests was successfully performed, and in situ measurements will now be carried out using the LabRAM HR microspectrometer at GeoRessources (Nancy, France). This technique will allow us to investigate, for the first time, nitrogen isotope fractionation during fluid segregation from a magma, mineral-fluid interaction, and magma degassing.
We are also planning to target additional terrestrial (mid-ocean ridge and ocean-island basalts) and extraterrestrial samples (e.g. iron meteorites, aubrites, ureilites, Martian meteorites, lunar basalts) for nitrogen and/or noble gas analyses in order to better understand the volatile characteristics of Earth and other planetary bodies in the inner Solar System. Several samples from the Moon and Mars have already been acquired for these studies, and preliminary results have been obtained.