DOI: 10.1002/2014GL061448
论文题名: Hydrogen site analysis of hydrous ringwoodite in mantle transition zone by pulsed neutron diffraction
作者: Purevjav N. ; Okuchi T. ; Tomioka N. ; Abe J. ; Harjo S.
刊名: Geophysical Research Letters
ISSN: 0094-9747
EISSN: 1944-9478
出版年: 2014
卷: 41, 期: 19 起始页码: 6718
结束页码: 6724
语种: 英语
英文关键词: hydrogen
; hydrous minerals
; mantle transition zone
; neutron diffraction
; ringwoodite
Scopus关键词: Geometry
; Hydration
; Hydrogen
; Hydrogen bonds
; Iron compounds
; Neutron diffraction
; Neutron sources
; Neutrons
; Silicon
; Electrical conductivity
; High-resolution neutron powder diffraction
; Hydrous mineral
; Japan proton accelerator research complexes
; Mantle transition zone
; Pulsed neutron diffractions
; Pulsed neutron sources
; Ringwoodite
; Crystal structure
; chemical bonding
; crystal structure
; hydrogen
; mantle
; neutron diffraction
; transition zone
; water content
英文摘要: Hydrogen site positions and occupancies in the crystal structure of synthetic hydrous ringwoodite have been determined for the first time by high-resolution neutron powder diffraction conducted at the pulsed neutron source at Japan Proton Accelerator Research Complex (J-PARC). It is demonstrated that hydrogen exchanges not only with Mg or Fe but also with Si cations to form hydroxyl and hydrogen bonding, both within the relevant octahedra or tetrahedra created by their surrounding oxygen anions. The hydrated octahedra shrink, whereas the hydrated tetrahedra expand. The occurrence of simultaneous hydration of octahedra and tetraheda is thus unambiguously confirmed, whereby the latter plays an especially unique role in reducing seismic velocity and for enhancing the electrical conductivity of ringwoodite at high pressures and temperatures. These results provide distinctive implications for discussing the physical properties of hydrous ringwoodite occurring in the mantle transition zone and evaluating the actual water content in the zone. Key Points Hydrogen site positions in ringwoodite crystal structure are first determinedHydrogen exchanges not only with Mg or Fe but also with Si in the structureThe nature of deep mantle water stored in the transition zone is revealed ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911088415&doi=10.1002%2f2014GL061448&partnerID=40&md5=4e68470dd5c76e54d843207b3f3eb9ca
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7011
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Institute for Study of the Earth's Interior, Okayama University, Misasa, Japan
Recommended Citation:
Purevjav N.,Okuchi T.,Tomioka N.,et al. Hydrogen site analysis of hydrous ringwoodite in mantle transition zone by pulsed neutron diffraction[J]. Geophysical Research Letters,2014-01-01,41(19).