DOI: 10.1002/2015GL064486
论文题名: Hydrogen self-diffusivity in single crystal ringwoodite: Implications for water content and distribution in the mantle transition zone
作者: Sun W. ; Yoshino T. ; Sakamoto N. ; Yurimoto H.
刊名: Geophysical Research Letters
ISSN: 0094-9276
EISSN: 1944-9007
出版年: 2015
卷: 42, 期: 16 起始页码: 6582
结束页码: 6589
语种: 英语
英文关键词: conductivity
; diffusion
; hydrogen
; mantle
; proton
Scopus关键词: Diffusion
; Electric conductivity
; Hydrogen
; Protons
; Temperature distribution
; Controlling mechanism
; Diffusion profiles
; Electrical conductivity
; Mantle
; Mantle transition zone
; Secondary ion mass spectrometers
; Temperature dependence
; Water concentrations
; Single crystals
; crystal
; deuterium
; diffusion
; electrical conductivity
; hydrogen
; iron
; lattice dynamics
; mantle
; ringwoodite
; temperature effect
; transition zone
; water content
英文摘要: Hydrogen lattice diffusion in Fe-bearing ringwoodite was investigated through hydrogen and deuterium interdiffusing in a pair of synthesized single crystals at various temperatures (1000-1300 K) at 21 GPa. Diffusion profiles were investigated by secondary ion mass spectrometer to determine the hydrogen self-diffusivity in ringwoodite. Temperature dependences of hydrogen diffusion in ringwoodite were determined to be DH = 10- 7.29(±0.46) exp[-101(±10)kJ mol- 1/RT] m2/s in ringwoodite at 21 GPa. The proton conductivities of ringwoodite estimated from the present diffusion coefficients are similar to those of Yoshino et al. [2008] at the transition zone condition at low water content (<1000 ppm by weight (ppmw)) but lower at higher water content range (>1000 ppmw). If the proton-vacancy mechanism is assumed to be a main controlling mechanism, contribution of water to the electrical conductivity of ringwoodite is insignificant due to large contribution of hopping conduction at the transition zone condition, and global average water concentration in the lower part of transition zone is less than 1000 ppmw. © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84941747743&doi=10.1002%2f2015GL064486&partnerID=40&md5=e32f2f89fc1bd5a1704d582b50b05c9e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8892
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institute for Study of the Earth's Interior, Okayama University, Misasa, Japan
Recommended Citation:
Sun W.,Yoshino T.,Sakamoto N.,et al. Hydrogen self-diffusivity in single crystal ringwoodite: Implications for water content and distribution in the mantle transition zone[J]. Geophysical Research Letters,2015-01-01,42(16).