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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

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1945-3027
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Volume 103, Issue 9

Issues

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

Hongzhan Fei
  • Bayerisches Geoinstitut, University of Bayreuth, Bayreuth D95440, Germany
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 6820193, Japan
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  • Other articles by this author:
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/ Sanae Koizumi / Naoya Sakamoto
  • Isotope Imaging Laboratory, Creative Research Institution, Hokkaido University, Sapporo 0010021, Japan
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  • De Gruyter OnlineGoogle Scholar
/ Minako Hashiguchi / Hisayoshi Yurimoto
  • Isotope Imaging Laboratory, Creative Research Institution, Hokkaido University, Sapporo 0010021, Japan
  • Department of Natural History Sciences, Hokkaido University, Sapporo, 0600810, Japan
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/ Katharina Marquardt / Nobuyoshi Miyajima / Tomoo Katsura
Published Online: 2018-08-28 | DOI: https://doi.org/10.2138/am-2018-6480

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.

Keywords: Mg grain-boundary diffusion; forsterite; upper mantle; Physics and Chemistry of Earth’s Deep Mantle and Core

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About the article


Received: 2018-01-24

Accepted: 2018-04-27

Published Online: 2018-08-28

Published in Print: 2018-09-25


Citation Information: American Mineralogist, Volume 103, Issue 9, Pages 1354–1361, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2018-6480.

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