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Shock compression of FeOOH and implications for iron-water interactions in super-earth magma oceans

Journal Article · · Nature Communications
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  1. Stanford Univ., CA (United States)
  2. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
  3. Centre National de la Recherche Scientifique (CNRS), Palaiseau (France). Laboratoire pour l'Utilisation des Lasers Intenses (LULI); École Polytechnique, Palaiseau (France); Commissariat a l'Energie Atomique (CEA), Palaiseau (France); Sorbonne Univ., Palaiseau (France)
  4. Sorbonne Univ., Paris (France); Muséum National d'Histoire Naturelle (MNHN), Paris (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC)
  5. Arizona State Univ., Tempe, AZ (United States)
  6. Sorbonne Univ., Paris (France); Muséum National d'Histoire Naturelle (MNHN), Paris (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC); Univ. of Grenoble Alpes, Grenoble (France); Centre National de la Recherche Scientifique (CNRS), Grenoble (France). Institut des Sciences de la Terre (ISTerre)
  7. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  8. Princeton Univ., NJ (United States)
  9. Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
+ Show Author Affiliations
Iron(Fe)-water reactions in a magma ocean can influence water storage and density of planets. These reactions can form Fe-O-H phases, whose density, melting, and electronic properties at planetary interior conditions are important for informing planetary models. Here, we study natural goethite (α-FeOOH) that is shock-compressed along its principal Hugoniot. Analysis of our velocity interferometer system for any reflector (VISAR) results extends the equation of state to over 800 GPa. X-ray diffraction and VISAR reflectivity results indicate the onset of melting occurs at ~95 GPa with complete melting by 166 GPa, which may be relevant to low seismic velocity anomalies observed above the core-mantle boundary. Analysis of X-ray emission spectroscopy results up to 285 GPa shows the spin crossover of Fe, with dominantly low spin Fe above ~265 GPa in the melt, supporting formation of dense basal magma oceans in terrestrial planets. Using our measured FeOOH densities, we model planetary interiors up to 10 Earth masses. Assuming FeOOH forms via iron-water reactions, the radius decreases by up to 28%, while the density increases by up to 165% compared to the unreacted cases, providing an avenue to investigate water storage and evolution in super-Earths and sub-Neptunes.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
3011713
Journal Information:
Nature Communications, Journal Name: Nature Communications; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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