Abstract
The presence of water may contribute to compositional heterogeneities observed in the deep lower mantle. Mg-rich ferropericlase (Fp) (Mg,Fe)O in the rock-salt structure is the second most abundant phase in a pyrolitic lower mantle model. To constrain water storage in the deep lower mantle, experiments on the chemical reaction between (Mg,Fe)O and H2O were performed in a laser-heated diamond-anvil cell at 95–121 GPa and 2000–2250 K, and the run products were characterized combining in situ synchrotron X-ray diffraction measurements with ex-situ chemical analysis on the recovered samples. The pyrite-structured phase FeO2Hx (x ≤ 1, Py-phase) containing a negligible amount of Mg (<1 at%) was formed at the expense of iron content in the Fp-phase through the reaction between (Mg,Fe)O and H2O, thus serving as water storage in the deepest lower mantle. The formation and segregation of nearly Mg-free Py-phase to the base of the lower mantle might provide a new insight into the deep oxygen and hydrogen cycles.
Acknowledgments and Funding
We thank Wancai Li, Yanping Yang, Xueye Du, and Junyue Wang for their assistance and support. This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 42150103 and 41902033). Portions of this work were performed at 15U1, Shanghai Synchrotron Radiation Facility (SSRF). Portions of this research were carried out at the P02.2 beamline of PETRA III. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities.
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Articles in the same Issue
- Mineralogy and bulk geochemistry of a fumarole at Hverir, Iceland: Analog for acid-sulfate leaching on Mars
- The crystal structure and chemistry of natural giniite and implications for Mars
- Solid solution of CaSiO3 and MgSiO3 perovskites in the lower mantle: The role of ferrous iron
- Secondary ion mass spectrometer analyses for trace elements in glass standards using variably charged silicon ions for normalization
- Raman shifts of c-BN as an ideal P-T sensor for studying water-rock interactions in a diamond-anvil cell
- Resetting of the U-Pb and Th-Pb systems in altered bastnäsite: Insight from the behavior of Pb at nanoscale
- X-ray diffraction reveals two structural transitions in szomolnokite
- Contamination of heterogeneous lower crust in Hannuoba tholeiite: Evidence from in situ trace elements and strontium isotopes of plagioclase
- Oxygen fugacity buffering in high-pressure solid media assemblies from IW-6.5 to IW+4.5 and application to the V K-edge oxybarometer
- Trace element partitioning between anhydrite, sulfate melt, and silicate melt
- Chemical reaction between ferropericlase (Mg,Fe)O and water under high pressure-temperature conditions of the deep lower mantle
- Composition-dependent thermal equation of state of B2 Fe-Si alloys at high pressure
- Effects of thermal annealing on water content and δ18O in zircon
- Tourmaline and zircon trace the nature and timing of magmatic-hydrothermal episodes in granite-related Sn mineralization: Insights from the Libata Sn ore field
- Cation ordering, twinning, and pseudo-symmetry in silicate garnet: The study of a birefringent garnet with orthorhombic structure
- The occurrence of monoclinic jarosite in natural environments
- Niobium speciation in minerals revealed by L2,3-edges XANES spectroscopy
- The first occurrence of the carbide anion, C4–, in an oxide mineral: Mikecoxite, ideally (CHg4)OCl2, from the McDermitt open-pit mine, Humboldt County, Nevada, U.S.A
- Hydrothermal alteration of Ni-rich sulfides in peridotites of Abu Dahr, Eastern Desert, Egypt: Relationships among minerals in the Fe-Ni-Co-O-S system, fO2 and fS2
- New Mineral Names: Arsenic and Lead