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Water Enhancement of Si Self-Diffusion in Wadsleyite

文献类型：期刊论文

作者Druzhbin, Dmitry1,2; Fei, Hongzhan1; Hao, Jialong3; Zhang, Chi3; Lin, Yangting3; Dohmen, Ralf4; Katsura, Tomoo1,5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2022-03-01
卷号127期号:3页码:13
关键词wadsleyite water Si self-diffusion coefficient mantle transition zone
ISSN号2169-9313
DOI10.1029/2021JB023440
英文摘要We 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.
WOS关键词TRANSITION-ZONE ; ELECTRICAL-CONDUCTIVITY ; PLASTIC-DEFORMATION ; O DIFFUSION ; TEMPERATURE ; OLIVINE ; RINGWOODITE ; HYDROGEN ; IRON ; SOLUBILITY
资助项目Deutsche Forschungsgemeinschaft[KA3434/7-1] ; Deutsche Forschungsgemeinschaft[KA3434/8-1]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000775583800001
出版者AMER GEOPHYSICAL UNION
资助机构Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft
源URL[http://ir.iggcas.ac.cn/handle/132A11/105030]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Fei, Hongzhan
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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