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American Mineralogist

Journal of Earth and Planetary Materials

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


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
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1945-3027
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Volume 100, Issue 1

Issues

Chlorine-hydroxyl diffusion in pargasitic amphibole

Wen Su
  • Corresponding author
  • State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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/ Don R. Baker
  • Earth and Planetary Sciences, GEOTOP-UQAM-McGill Research Centre, McGill University, 3450 rue University, Montreal, Quebec H3A OE8, Canada
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/ Luping Pu / Liping Bai
  • Earth and Planetary Sciences, GEOTOP-UQAM-McGill Research Centre, McGill University, 3450 rue University, Montreal, Quebec H3A OE8, Canada
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/ Xin Liu
  • State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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/ Cedrick O’Shaughnessy
  • Earth and Planetary Sciences, GEOTOP-UQAM-McGill Research Centre, McGill University, 3450 rue University, Montreal, Quebec H3A OE8, Canada
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Published Online: 2015-01-10 | DOI: https://doi.org/10.2138/am-2015-4779

Abstract

Chlorine-hydroxyl diffusion was measured in pargasitic amphibole from Yunnan province, China at 1.0 GPa, 625 to 800 °C. Experiments were performed by immersing unoriented crystals in waterbearing NaCl in a piston cylinder for durations from 100 to 454 h. Diffusion profiles were on the order of greater than tens of micrometers in length, and electron microprobe analysis allow us to extract semi-quantitative diffusivities from these experiments. The preliminary diffusion coefficients for chlorine in amphibole in the water-bearing experiments are 2.6 × 10-16 m2/s at 625 °C, 4.9 × 10-16 m2/s at 650 °C, 7.6 × 10-16 m2/s at 700 °C, 1.8 × 10-15 m2/s at 750 °C, 2.8 × 10-15 m2/s at 800 °C. For temperatures between 625 and 800 °C, the Arrhenius relation for chlorine-hydroxyl diffusion has an activation energy of 106.6 ± 7.8 kJ/K mol and a D0 of 4.53 (+7.3, -2.8) × 10-10 m2/s. Our measurements do not show evidence of anisotropy in the diffusion of Cl-OH into amphibole, but future experiments need to better investigate this possibility.

Keywords: Diffusion; chlorine-hydroxyl; pargasitic amphibole; crystal-chemistry; high temperature and pressure

About the article

Received: 2013-10-18

Accepted: 2014-06-23

Published Online: 2015-01-10

Published in Print: 2015-01-01


Citation Information: American Mineralogist, Volume 100, Issue 1, Pages 138–147, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2015-4779.

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© 2015 by Walter de Gruyter Berlin/Boston.

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