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Assignment of infrared OH-stretching bands in manganoan magnesio-arfvedsonite and richterite through heat-treatment

¹ Department of Evolution of Earth Environment, Graduate School of Social and Cultural Studies, Kyushu University, 4-2-1 Ropponmatsu, Chuo-ku, Fukuoka 810-8560, Japan
² Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

Correspondence: ^* E-mail: kiyota{at}rc.kyushu-u.ac.jp

Infrared OH-stretching bands in some heat-treated A-site occupied and ^IVAl-free (or nearly free) manganoan sodic-calcic and sodic amphiboles, manganoan magnesio-arfvedsonites and richterites, have been assigned. Two OH-stretching bands, (MgMgMg)-OH-A-O^2–/F^–/Cl^– and (MgMgMg)-OH- ( = vacancy) configurations, persist to high temperature. With increasing temperature, the OH-stretching band, A*, of the (MgMgMg)-OH-A-OH (A = A site cation) configuration shifts downward from 3730 to near 3700 cm^–1 with formation of the (MgMgMg)-OH-A-O^2– configuration; the repulsive interaction between the proton and the A cation is removed through dehydrogenation of OH at the O3 site, coupled with movement of the A cation toward the dehydrogenated side. In natural F-and Cl-bearing sodic-calcic and sodic amphiboles, two kinds of (MgMgMg)-OH-A stretching bands are observed at around 3730 and 3700 cm^–1, in which A-site alkali ions move toward the F^–(Cl^–)substituted O3 site. In this manner, (MgMgMg)-OH-K and (MgMgMg)-OH-Na bands shift downward 20 cm^–1 and 26–29 cm^–1 by heat-treatment, respectively, reflecting the different size of the A-site cations.

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