期刊
PHYSICS AND CHEMISTRY OF MINERALS
卷 36, 期 9, 页码 537-544出版社
SPRINGER
DOI: 10.1007/s00269-009-0299-x
关键词
Dissolution; Chlorite; FIB; TEM
资金
- JSPS Research
- Ministry of Education, Culture, Sports, Science and Technology
- Grants-in-Aid for Scientific Research [21340157] Funding Source: KAKEN
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 25A degrees C for 31 days. The obtained Si and Mg dissolution rates are -11.49 and -11.14 (logR, mol/(m(2)/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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