Abstract
The structures of cold-compressed basaltic glass were investigated at pressures up to 18 GPa using in situ X‑ray and neutron diffraction techniques to understand the physicochemical properties of deep magmas. On compression, basaltic glass changes its compression behavior: the mean O-O coordination number (CNOO) starts to rise while maintaining the mean O-O distance (rOO) above about 2–4 GPa, and then CNOO stops increasing, and rOO begins to shrink along with the increase in the mean coordination number of Al (CNAlO) above ~9 GPa. The change around 9 GPa is interpreted by the change in contraction mechanism from bending tetrahedral networks of glass to increasing oxygen packing ratio via the increase in CNAlO. The analysis of the oxygen packing fraction (ηO) under high pressure reveals that ηO exceeds the value for dense random packing, suggesting that the oxygen-packing hypothesis recently proposed cannot account for pressure-induced structural transformations of silica and silicate glasses. The rise of the CNOO at 2–4 GPa reflects the elastic softening of fourfold-coordinated silicate glass, which may be the origin of anomalies of elastic moduli in basaltic glass at ~2 GPa previously reported by Liu and Lin (2014).
The widths of both the first sharp diffraction peak and the principal peak show contrastive compression behaviors between modified silicate and silica glasses. This result suggests that modified silicate glasses represent different pressure evolutions in the intermediate- and extended-range order structures from those of silica glass, likely due to the presence of modifier cations and the resultant formations of smaller rings and cavity volume.
Funding statement: This study was realized with supports of JSPS KAKENHI of Grant Nos. JP15H05828, JP16K13901, JP19H01985, and JP19K21890 to A.S., and of Grant Nos. JP17H04860 and JP17K18797 to T. S. The XRD experiments were conducted at AR-NE5C beamline with the approval of the KEK (Proposal No. 2017G580). The ND experiments were performed at BL11 PLANET beamline at the MLF of the J-PARC under user programs (Proposal Nos. 2017A0012 and 2017B0061).
Acknowledgments
We are grateful to two anonymous reviewers for their constructive comments. The support of Kazuko Obata (Tohoku University) in the preparation, Kazuki Watanabe (Mitsubishi Electric System & Service Co., Ltd.) in carrying out the synchrotron XRD experiments at KEK, and Asami Sano (Japan Atomic Energy Agency) in performing the ND experiments at J-PARC are highly appreciated. Yoshio Kono (Ehime University) provided T.O. with illuminating suggestions and comments, especially on the oxygen-oxygen correlation at the 59th High Pressure Conference of Japan held in Okayama, Japan. Yuki Shibazaki (KEK) suggested references relevant to the interpretation of the FSDP to T.O. The authors thank Enago (www.engo.jp) for the English language review. There are no conflicts of interest to declare. T.S. and A.S. designed this work. T.O. wrote the paper with contributions from all coauthors. T.O., T.S., N.H., K.F., and A.S. conducted the XRD experiments. T.O., T.S., T.H., and J.A. performed the ND experiments. T.O. and T.S. analyzed the data with help from K.F. and T.H.
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- Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle
- Melting phase relation of Fe-bearing Phase D up to the uppermost lower mantle
- Evidence from HP/UHP metasediments for recycling of isotopically heterogeneous potassium into the mantle
- Effect of sulfur on siderophile element partitioning between olivine and a primary melt from the martian mantle
- Gold speciation in hydrothermal fluids revealed by in situ high energy resolution X-ray absorption spectroscopy
- Characterization of carbon phases in Yamato 74123 ureilite to constrain the meteorite shock history
- Pressure-induced structural phase transitions in natural kaolinite investigated by Raman spectroscopy and electrical conductivity
- Magnetite-rutile symplectite in ilmenite records magma hydration in layered intrusions
- Ferromagnesian jeffbenite synthesized at 15 GPa and 1200 °C
- Electrical conductivity of metasomatized lithology in subcontinental lithosphere
- Measurements of the Lamb-Mössbauer factor at simultaneous high-pressure-temperature conditions and estimates of the equilibrium isotopic fractionation of iron
- Element mobility and oxygen isotope systematics during submarine alteration of basaltic glass
- Dissolved silica-catalyzed disordered dolomite precipitation
- Elasticity and high-pressure behavior of Mg2Cr2O5 and CaTi2O4-type phases of magnesiochromite and chromite
- Significance of tridymite distribution during cooling and vapor-phase alteration of ignimbrites
- Micropores and mass transfer in the formation of myrmekites
- Mn3+ and the pink color of gem-quality euclase from northeast Brazil
- Geochemistry and boron isotope compositions of tourmalines from the granite-greisen-quartz vein system in Dayishan pluton, Southern China: Implications for potential mineralization
- Lazaraskeite, Cu(C2H3O3)2, the first organic mineral containing glycolate, from the Santa Catalina Mountains, Tucson, Arizona, U.S.A
- Textural, fluid inclusion, and in-situ oxygen isotope studies of quartz: Constraints on vein formation, disequilibrium fractionation, and gold precipitation at the Bilihe gold deposit, Inner Mongolia, China
- Immiscible metallic melts in the upper mantle beneath Mount Carmel, Israel: Silicides, phosphides, and carbides
Articles in the same Issue
- Structure of basaltic glass at pressures up to 18 GPa
- Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle
- Melting phase relation of Fe-bearing Phase D up to the uppermost lower mantle
- Evidence from HP/UHP metasediments for recycling of isotopically heterogeneous potassium into the mantle
- Effect of sulfur on siderophile element partitioning between olivine and a primary melt from the martian mantle
- Gold speciation in hydrothermal fluids revealed by in situ high energy resolution X-ray absorption spectroscopy
- Characterization of carbon phases in Yamato 74123 ureilite to constrain the meteorite shock history
- Pressure-induced structural phase transitions in natural kaolinite investigated by Raman spectroscopy and electrical conductivity
- Magnetite-rutile symplectite in ilmenite records magma hydration in layered intrusions
- Ferromagnesian jeffbenite synthesized at 15 GPa and 1200 °C
- Electrical conductivity of metasomatized lithology in subcontinental lithosphere
- Measurements of the Lamb-Mössbauer factor at simultaneous high-pressure-temperature conditions and estimates of the equilibrium isotopic fractionation of iron
- Element mobility and oxygen isotope systematics during submarine alteration of basaltic glass
- Dissolved silica-catalyzed disordered dolomite precipitation
- Elasticity and high-pressure behavior of Mg2Cr2O5 and CaTi2O4-type phases of magnesiochromite and chromite
- Significance of tridymite distribution during cooling and vapor-phase alteration of ignimbrites
- Micropores and mass transfer in the formation of myrmekites
- Mn3+ and the pink color of gem-quality euclase from northeast Brazil
- Geochemistry and boron isotope compositions of tourmalines from the granite-greisen-quartz vein system in Dayishan pluton, Southern China: Implications for potential mineralization
- Lazaraskeite, Cu(C2H3O3)2, the first organic mineral containing glycolate, from the Santa Catalina Mountains, Tucson, Arizona, U.S.A
- Textural, fluid inclusion, and in-situ oxygen isotope studies of quartz: Constraints on vein formation, disequilibrium fractionation, and gold precipitation at the Bilihe gold deposit, Inner Mongolia, China
- Immiscible metallic melts in the upper mantle beneath Mount Carmel, Israel: Silicides, phosphides, and carbides