Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series
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Kiyotaka Ishida
Abstract
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 3725~3680 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(O2-,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 ~3669 cm-1 is assigned to the configuration M4CaM4(Mg,Fe2+,Mn2+,Na):(MgMgMg)-OH-A◻: T1Si T1Si (◻ = 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 M1Fe2+M1Mg M3Mg-OH-A◻, and the lower-frequency band B' to M1MgM1MgM3Fe2+-OHA◻; the higher-frequency band C' is assigned to M1Fe2+M1Fe2+M3Mg-OH-A◻ and the lower-frequency band C'' to M1Mg M1Fe2+M3Fe2+-OH-A◻. Some broad OH-stretching bands attributed to (M1M1M3)- OH-A◻:T1Si T1Al are observed at 3640~3580 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 O2--(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-O2- configuration
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
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Artikel in diesem Heft
- Thermal equations of state for B1 and B2 KCl
- Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses
- H2O activity in H2O-N2 fluids at high pressure and temperature measured by the brucitepericlase equilibrium
- Kinetics of iron oxidation-reduction in hydrous silicic melts
- Kinetics of cation ordering in synthetic MgAl2O4 spinel
- Structural properties and heat-induced oxidation-dehydrogenation of manganoan ilvaite from Perda Niedda mine, Sardinia, Italy
- Ultrahigh-pressure metamorphism in western Tianshan, China: Part I. Evidence from inclusions of coesite pseudomorphs in garnet and from quartz exsolution lamellae in omphacite in eclogites
- Ultra-high pressure metamorphism in western Tianshan, China: Part II. Evidence from magnesite in eclogite
- Discovery of clinoenstatite in garnet pyroxenites from the Dabie-Sulu ultrahigh-pressure terrane, east-central China
- Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan- Sulu UHP terrane, eastern China
- Metamictization and recrystallization of titanite: An infrared spectroscopic study
- Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series
- Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York
- The substitution Fe3+-Al and the isosymmetric displacive phase transition in synthetic zoisite: A powder X-ray and infrared spectroscopy study
- In situ X-ray observation of the reaction dolomite = aragonite + magnesite at 900–1300 K
- High-pressure single-crystal X-ray and powder neutron study of F,OH/OD-chondrodite: Compressibility, structure, and hydrogen bonding
- Quantitative characterization of biotic iron oxides by analytical electron microscopy
- Synthesis and NMR characterization (1H and 31P MAS) of the fluorine-free hydroxylapatite–britholite-(Y) series
- Quantum mechanical calculations of dioctahedral 2:1 phyllosilicates: Effect of octahedral cation distributions in pyrophyllite, illite, and smectite
- The nature of disorder in montmorillonite by simulation of X-ray powder patterns
- Ferripedrizite, a new monoclinic BLi amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles
- Description and crystal structure of vajdakite, [(Mo6+O2)2(H2O)2 As3+ 2O5]·H2O—A new mineral from Jáchymov, Czech Republic
- Some remarks on fission-track observational biases and crystallographic orientation effects
- Surface reconstruction and As-polymerization at fractured loellingite (FeAs2) surfaces
- The strength of moissanite
- Diamond formation through carbonate-silicate interaction
- Anisotropic Fe-Mg diffusion in biotite
- Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty
