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Modification to the crystal structure of chlorite during early stages of its dissolution

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Abstract

Early stage processes of Mg-rich chlorite (clinochlore) dissolution were examined, focusing especially on the structural modification at grain edges during dissolution. Focused ion beam transmission electron microscopy sample preparation was applied to crystals dissolved in a flow-through reaction system at pH 3.0 and 25°C for 31 days. The obtained Si and Mg dissolution rates are −11.49 and −11.14 (logR, mol/(m2/s)), respectively, implying dissolution is non-stoichiometric. TEM-EDX analyses of dissolved samples reveal the development of 20–50-nm thick amorphous zone at an outermost rim with a chemical gradient of Mg, lower towards the solid surface, and Si enrichment in this amorphous zone. Crystalline material is partially interwoven with amorphous one at the interface between the amorphous and crystalline regions. These results indicate that the amorphous zone was produced by selective leaching of cations except for Si. Chlorite dissolution may proceed via the formation and thickening of leached layer as a by-product of release to solution of Si at slightly slower rate than Mg.

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Acknowledgments

One of the authors (JK) was financially supported by JSPS Research Fellowship for Young Scientists. This work was partly supported by a Grant-in-Aid of the Ministry of Education, Culture, Sports, Science and Technology to TM. Martin Lee and one anonymous reviewer are thanked for their critical comments which helped to improve the manuscript. Most of microscopy studies were carried out at the Electron Microbeam Analysis Facility for Mineralogy at the Department of Earth and Planetary Science, the University of Tokyo.

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  1. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    Jun Kameda, Hirokazu Sugimori & Takashi Murakami

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  1. Jun Kameda
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  2. Hirokazu Sugimori
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  3. Takashi Murakami
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Correspondence to Takashi Murakami.

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Kameda, J., Sugimori, H. & Murakami, T. Modification to the crystal structure of chlorite during early stages of its dissolution. Phys Chem Minerals 36, 537–544 (2009). https://doi.org/10.1007/s00269-009-0299-x

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