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Pressure, temperature, water content, and oxygen fugacity dependence of the Mg grain-boundary diffusion coefficient in forsterite

  • Hongzhan Fei EMAIL logo , Sanae Koizumi , Naoya Sakamoto , Minako Hashiguchi , Hisayoshi Yurimoto , Katharina Marquardt , Nobuyoshi Miyajima and Tomoo Katsura
Published/Copyright: August 28, 2018
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Abstract

The Mg grain boundary diffusion coefficients were measured in forsterite aggregates as a function of pressure (1 atm and 13 GPa), temperature (1100–1300 K), water content (<1–350 wt. ppm bulk water), and oxygen fugacity (10–18–10–0.7 bar) using a multi-anvil apparatus and a gas-mixing furnace. The diffusion profiles were analyzed by secondary ion mass spectrometer, whereas the water contents in the samples were measured by Fourier transform infrared spectrometer. The activation volume, activation enthalpy, water content exponent, and oxygen fugacity exponent for the Mg grain-boundary diffusion coefficients are found to be 3.9 ± 0.7 cm3/mol, 355 ± 25 kJ/mol, 1.0 ± 0.1, and –0.02 ± 0.01, respectively. By comparison with the Mg lattice diffusion data (Fei et al. 2018), the bulk diffusivity of Mg in forsterite is dominated by lattice diffusion if the grain size is larger than ~1 mm under upper mantle conditions, whereas effective grain-boundary and lattice diffusivities are comparable when the grain size is ~1–100 μm.


† Present address: Research Center for Planetary Trace Organic Compounds, Kyushu University, Motooka, Nishi-ku, Fukuoka, 8190395, Japan.

‡ Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.


Acknowledgments

We appreciate the help of Sumit Chakraborty and Ralf Dohmen at Ruhr-University Bochum for thin film deposition, and Chengcheng Zhao, Lin Wang, and Esther Posner for discussions. We also thank Sylvie Demouchy and Ralf Milke for constructive comments. This work is funded by the Deutsche Forschungsgemeinschaft (DFG) to T. Katsura (KA3434/3-1, KA3434/7-1, KA3434/8-1, and KA3434/9-1), the Japan Society for the Promotion of Science (JSPS) to H. Fei (25003327), the JSPS KAKENHI Grant to H. Yurimoto (20002002), and the Earthquake Research Institute’s cooperative research program. The TEM at BGI was financed by the DFG grant (No. INST 91/251-1 FUGG).

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Received: 2018-01-24
Accepted: 2018-04-27
Published Online: 2018-08-28
Published in Print: 2018-09-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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