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1 SETI Institute/NASA-Ames Research Center, Moffett Field, CA 94035, USA, 2 Bayerisches Geologisches Landesamt, Leopoldstrasse 30, D-95603 Marktredwitz, Germany, and 3 Department of Earth and Environment, Mount Holyoke College, South Hadley, MA 01075, USA
* E-mail: jbishop{at}mail.arc.nasa.gov
(Received 29 June 2001; revised 14 November 2001)
Analysis of the near-infrared (NIR) spectral bands of phyllosilicates, together with the mid-infrared bands, enables testing and confirmation of band assignments for the structural OH vibrations. Spectral analyses of selected smectites and serpentine-kaolin minerals are presented here. The results of this study indicate that dioctahedral smectites may contain both in-plane and out-of-plane OH-bending vibrations, as suggested by Farmer (1974). In-plane bands occur near 800–915 cm–1, while the weaker out-of-plane vibrations occur near 600–700 cm–1 and are enhanced in dioctahedral smectites when the structure is disrupted by substitutions. Analysis of the OH-stretching vibrations and their NIR overtone bands is also presented for both smectites and serpentine-kaolin minerals. These overtones are more straightforward for serpentines than for kaolinite, and a strong overtone associated with the kaolinite OH-stretching band at 3620 cm–1 is found that supports its assignment as an OH-stretching band.
KEYWORDS: infrared spectroscopy, smectites, serpentines, kaolinite, structural OH
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