IGGCAS OpenIR  > 地球与行星物理院重点实验室
Water Enhancement of Si Self-Diffusion in Wadsleyite
Druzhbin, Dmitry1,2; Fei, Hongzhan1; Hao, Jialong3; Zhang, Chi3; Lin, Yangting3; Dohmen, Ralf4; Katsura, Tomoo1,5
2022-03-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume127Issue:3Pages:13
AbstractWe investigated the H2O-content dependence of Si self-diffusion coefficient in Fe-free wadsleyite using multi-anvil experiments at pressures of 19-20 GPa, temperatures of 1573-1873 K, and H2O-content ranging from similar to 10 to 5,300 wt. ppm by the isotopic thin-film diffusion-couple method. The Si-29-doped diffusion profiles were measured by nanoscale secondary ion mass spectrometry in the depth profiling mode. The H2O contents in the samples were analyzed by Fourier transformation infrared spectroscopy. The experimental results show a H2O enhancement of Si diffusion coefficient with a H2O content exponent of 0.8 +/- 0.1. The activation enthalpy was found to be 270 +/- 40 kJ/mol. The diffusion coefficients in the [100], [010], and [001] directions are indistinguishable. The temperature and H2O-content dependences of Si diffusion indicate that H2O incorporation dramatically reduces the rheological strength of wadsleyite, whereas temperature has a relatively small effect. The viscosity in the mantle transition zone could be significantly reduced by H2O incorporation in wadsleyite. The viscosity contrast between mantle plumes and surroundings may control the evolution of plume shapes at 410-660 km depths.
Keywordwadsleyite water Si self-diffusion coefficient mantle transition zone
DOI10.1029/2021JB023440
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft
WOS KeywordTRANSITION-ZONE ; ELECTRICAL-CONDUCTIVITY ; PLASTIC-DEFORMATION ; O DIFFUSION ; TEMPERATURE ; OLIVINE ; RINGWOODITE ; HYDROGEN ; IRON ; SOLUBILITY
Language英语
Funding ProjectDeutsche Forschungsgemeinschaft[KA3434/7-1] ; Deutsche Forschungsgemeinschaft[KA3434/8-1]
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000775583800001
PublisherAMER GEOPHYSICAL UNION
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105030
Collection地球与行星物理院重点实验室
Corresponding AuthorFei, Hongzhan
Affiliation1.Univ Bayreuth, Bayer Geoinst, Bayreuth, Germany
2.European Synchrotron Radiat Facil ESRF, Grenoble, France
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
4.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Bochum, Germany
5.Ctr High Pressure Sci & Technol Adv Res, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Druzhbin, Dmitry,Fei, Hongzhan,Hao, Jialong,et al. Water Enhancement of Si Self-Diffusion in Wadsleyite[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(3):13.
APA Druzhbin, Dmitry.,Fei, Hongzhan.,Hao, Jialong.,Zhang, Chi.,Lin, Yangting.,...&Katsura, Tomoo.(2022).Water Enhancement of Si Self-Diffusion in Wadsleyite.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(3),13.
MLA Druzhbin, Dmitry,et al."Water Enhancement of Si Self-Diffusion in Wadsleyite".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.3(2022):13.
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