Abstract
The electrical conductivity and elasticity of deep hydrous phases are essential to constraining water distribution, as well as deciphering the origins of conductivity anomalies in the lower mantle. To uncover the impact of iron-bearing δ-AlOOH on the geophysical properties of the lower mantle, we carried out synchrotron X‑ray diffraction and electrical conductivity measurements on δ-(Al0.52Fe0.48)OOH and (Al0.95Fe0.05)OOH in diamond-anvil cells at pressures up to 75 GPa at room temperature. A sharp volume reduction of ~6.5% was observed in δ-(Al0.52Fe0.48)OOH across the spin transition at 40.8–43.3 GPa, where its electrical conductivity increases steadily without abrupt changes. The electrical conductiv‑ ity of δ-(Al0.52Fe0.48)OOH is greater than that of pure δ-AlOOH at high pressure, suggesting that both small polaron and proton conduction mechanisms dominate in iron-bearing δ-AlOOH. Furthermore, the high-pressure electrical conductivity profiles are comparable between δ-(Al0.95Fe0.05)OOH and δ-(Al0.52Fe0.48)OOH, indicating that high-iron content only marginally influences the conductivity of iron-bearing δ-AlOOH. Notably, the electrical conductivity of iron-bearing δ-AlOOH along the North Philippine geotherm is greater than the average 1D electrical conductivity profile in the mantle (Ohta et al. 2010a). This result suggests that δ-(Al,Fe)OOH is a promising candidate to account for high conductivity in some subducting slabs.
Funding statement: This study is funded by the National Key Research and Development Program of China (2019YFA0708502). Y. Zhuang is supported by the China Postdoctoral Science Foundation (18NZ021-0213-216308). J. Liu acknowledges support from the National Natural Science Foundation of China (Grant no. 42072052 and U1930401). In situ XRD measurements were performed at the BL 10XU beamline of SPring-8 (Proposal 2019A1284 and 2019B1203). SPring-8 is supported by the National Science Foundation Earth Sciences (Grant No. EAR1128799) and the Department of Energy-GeoSciences (Grant No. DE-FG02-94ER14466). Some ex‑ periments are supported by the Synergic Extreme Condition User Facility (SECUF).
Acknowledgments
We thank Bingmin Yan, Hu Tang, Jiuhua Chen, and Shuailing Ma for providing their technical support for the multi-anvil press experiments, as well as Saori Kawa‑ guchi and Naohisa Hirao for their assistance with synchrotron XRD experiments.
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Articles in the same Issue
- Eu speciation in apatite at 1 bar: An experimental study of valence-state partitioning by XANES, lattice strain, and Eu/Eu* in basaltic systems
- The effect of composition on chlorine solubility and behavior in silicate melts
- High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO3OH system
- Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions
- X-ray absorption spectroscopy study of Mn reference compounds for Mn speciation in terrestrial surface environments
- Heterogeneous and retarded phase transformation of ferrihydrite on montmorillonite surface: The important role of surface interactions
- Atomic-scale characterization of the oxidation state of Ti in meteoritic hibonite: Implications for early solar system thermodynamics
- Structural behavior of C2/m tremolite to 40 GPa: A high-pressure single-crystal X-ray diffraction study
- Optimizing Raman spectral collection for quartz and zircon crystals for elastic thermobarometry
- Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward
- Arsenic clustering in arsenian pyrite: A combined photoemission and theoretical modeling study
- High-pressure electrical conductivity and elasticity of iron-bearing δ-AlOOH
- Nudged elastic band calculations of the (4H)XSi hydrogarnet type defect in Mg2SiO4 forsterite
- Mn substitution and distribution in goethite and influences on its photocatalytic properties: A combined study using first-principles calculations and photocatalytic experiments
- Incorporating previously neglected excess oxygen associated with ferric iron in matrix corrections of microprobe data from cubic and rhombohedral Fe-Ti oxides
- Recycled carbonates in the mantle sources of natural kamafugites: A zinc isotope perspective
- Raman analysis of octocoral carbonate ion structural disorder along a natural depth gradient, Kona coast, Hawai‘i
- Memorial of Charles Wilson Burnham, 1933–2021
- Erratum
Articles in the same Issue
- Eu speciation in apatite at 1 bar: An experimental study of valence-state partitioning by XANES, lattice strain, and Eu/Eu* in basaltic systems
- The effect of composition on chlorine solubility and behavior in silicate melts
- High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO3OH system
- Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions
- X-ray absorption spectroscopy study of Mn reference compounds for Mn speciation in terrestrial surface environments
- Heterogeneous and retarded phase transformation of ferrihydrite on montmorillonite surface: The important role of surface interactions
- Atomic-scale characterization of the oxidation state of Ti in meteoritic hibonite: Implications for early solar system thermodynamics
- Structural behavior of C2/m tremolite to 40 GPa: A high-pressure single-crystal X-ray diffraction study
- Optimizing Raman spectral collection for quartz and zircon crystals for elastic thermobarometry
- Measuring H2O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward
- Arsenic clustering in arsenian pyrite: A combined photoemission and theoretical modeling study
- High-pressure electrical conductivity and elasticity of iron-bearing δ-AlOOH
- Nudged elastic band calculations of the (4H)XSi hydrogarnet type defect in Mg2SiO4 forsterite
- Mn substitution and distribution in goethite and influences on its photocatalytic properties: A combined study using first-principles calculations and photocatalytic experiments
- Incorporating previously neglected excess oxygen associated with ferric iron in matrix corrections of microprobe data from cubic and rhombohedral Fe-Ti oxides
- Recycled carbonates in the mantle sources of natural kamafugites: A zinc isotope perspective
- Raman analysis of octocoral carbonate ion structural disorder along a natural depth gradient, Kona coast, Hawai‘i
- Memorial of Charles Wilson Burnham, 1933–2021
- Erratum