Modeling H, Na, and K diffusion in plagioclase feldspar by relating point defect parameters to bulk properties

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• 作者：Baohua Zhang ; Shuangming Shan ; Xiaoping Wu
• 关键词：Diffusion ; Hydrogen ; Sodium ; Potassium ; Plagioclase feldspar ; cBΩ model
• 刊名：Physics and Chemistry of Minerals
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：43
• 期：2
• 页码：151-159
• 全文大小：1,275 KB
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• 作者单位：Baohua Zhang (1)
  Shuangming Shan (1)
  Xiaoping Wu (2)
  
  1. Key Laboratory for High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, Guizhou, People’s Republic of China
  2. School of Earth and Space Science, University of Science and Technology of China, Hefei, 230026, People’s Republic of China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Mineralogy
  Crystallography
  Geochemistry
  Mineral Resources
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2021

文摘

Hydrogen and alkali ion diffusion in plagioclase feldspars is important to study the evolution of the crust and the kinetics of exsolution and ion-exchange reactions in feldspars. Using the available PVT equation of state of feldspars, we show that the diffusivities of H and alkali in plagioclase feldspars as a function of temperature can be successfully reproduced in terms of the bulk elastic and expansivity data through a thermodynamic model that interconnects point defect parameters with bulk properties. Our calculated diffusion coefficients of H, Na, and K well agree with experimental ones when uncertainties are considered. Additional point defect parameters such as activation enthalpy, activation entropy, and activation volume are also predicted. Furthermore, the electrical conductivity of feldspars inferred from our predicted diffusivities of H, Na, and K through the Nernst–Einstein equation is compared with previous experimental data. Keywords Diffusion Hydrogen Sodium Potassium Plagioclase feldspar cBΩ model