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Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series

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

Fine structure in the principal OH-stretching bands of amphiboles of the tremolite-ferro-actinolite series have been examined. In samples with partly filled A sites, a broad (composite) band is observed at 3725~680 cm^–1 and is assigned to two types of configurations: (M1M1M3)-OH-^A(Na,K):^T1Si ^T1Al in which Al occurs at the T1 site, and (M1M1M3)-OH-^A(Na,K)-^O3(O^2–,F^–,Cl^–); the component of (M1M1M3)-OH-^A(Na,K):^T1Si ^T1Si configuration is small, because Na and K at the A site are locally associated with Al at an adjacent T1 site. In tremolite, manganoan tremolite, and Fe²⁺-poor actinolite, a weak shoulder on the principal A band at ~669 cm^–1 is assigned to the configuration ^M4Ca^M4(Mg,Fe²⁺,Mn²⁺,Na):(MgMgMg)-OH-^{A T1}Si ( = vacancy). Fine structure in the principal bands B (B' and B'') and C (C' and C'') are also observed: the higher-frequency band B'' is assigned to ^M1Fe^{2+ M1}Mg ^M3Mg-OH-^A, and the lower-frequency band B' to ^M1Mg^M1Mg^M3Fe²⁺-OH-^A; the higher-frequency band C' is assigned to ^M1Fe^{2+ M1}Fe^{2+ M3}Mg-OH-^A and the lower-frequency band C'' to ^M1Mg ^M1Fe^{2+ M3}Fe²⁺-OH-^A. Some broad OH-stretching bands attributed to (M1M1M3)-OH-^A:^T1Si ^T1Al are observed at 3640~580 cm^–1. In amphiboles of the tremolite-ferro-actinolite series that show a substantial B [(MgMgFe²⁺)-OH] band, a new OH-stretching band (at around 3641 cm^–1), E, appears near the principal C band (at around 3643 cm^–1) on heat treatment. The shape of band E is similar to that of the original band B, and its local configuration is O^2–-(MgMgFe³⁺)-OH^–. A weak and broad band A** appears at ~3690 cm^–1 on heat treatment of some Na-bearing actinolites, and is ascribed to the (MgMgMg)-OH-^ANa-O^2– configuration.

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