|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 SETI Institute/NASA-Ames Research Center, Moffett Field, CA 94035, USA, 2 Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-84236 Bratislava, Slovakia, and 3 Austrian Research Centers Seibersdorf, Chemical Analytics, A-2444 Seibersdorf, Austria
* E-mail: jbishop{at}mail.arc.nasa.gov
(Received 29 June 2001; revised 14 November 2001)
Visible to near-infrared (NIR) reflectance spectra and mid-IR transmittance spectra are presented here for a collection of dioctahedral smectites. Analysis of the structural OH vibrations is performed by comparing the NIR combination and overtone bands with fundamental stretching and bending absorption features in the mid-IR region. Second derivatives are used to determine the actual band centres, which are often shifted slightly by a spectral continuum in the reflectance or transmittance spectra. New bands have been identified near 4170 and 4000 cm–1 in the NIR spectra of nontronite with tetrahedral substitution. A related band is observed near 4100 cm–1 for montmorillonites with substantial tetrahedral and/or octahedral substitution. These bands are correlated with the mid-IR bands near 680 cm–1 for nontronite and near 630 cm–1 for montmorillonite. Comparison of the OH overtone and combination bands with the fundamental stretching and bending vibrations gives consistent results.
KEYWORDS: infrared spectroscopy, smectites, structural OH, montmorillonite, nontronite
This article has been cited by other articles:
|
|
 |
|
  L. De Pablo, M. Doval, and A. La Iglesia Geochemistry of reversible hydratable tephra from the Trans Mexican Volcanic Belt American Mineralogist, November 1, 2009; 94(11-12): 1603 - 1615. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. L. Bishop, E. Z. N. Dobrea, N. K. McKeown, M. Parente, B. L. Ehlmann, J. R. Michalski, R. E. Milliken, F. Poulet, G. A. Swayze, J. F. Mustard, et al. Phyllosilicate Diversity and Past Aqueous Activity Revealed at Mawrth Vallis, Mars Science, August 8, 2008; 321(5890): 830 - 833. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. D. DYAR, M. W. SCHAEFER, E. C. SKLUTE, and J. L. BISHOP Mossbauer spectroscopy of phyllosilicates: effects of fitting models on recoil-free fractions and redox ratios Clay Minerals, March 1, 2008; 43(1): 3 - 33. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. BISHOP, M. D. LANE, M. D. DYAR, and A. J. BROWN Reflectance and emission spectroscopy study of four groups of phyllosilicates: smectites, kaolinite-serpentines, chlorites and micas Clay Minerals, March 1, 2008; 43(1): 35 - 54. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. EGLI, A. MIRABELLA, G. SARTORI, D. GIACCAI, R. ZANELLI, and M. PLOTZE Effect of slope aspect on transformation of clay minerals in Alpine soils Clay Minerals, September 1, 2007; 42(3): 373 - 398. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. E. Christidis Genesis and compositional heterogeneity of smectites. Part III: Alteration of basic pyroclastic rocks--A case study from the Troodos Ophiolite Complex, Cyprus American Mineralogist, April 1, 2006; 91(4): 685 - 701. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. E. CHRISTIDIS, F. DELLISANTI, G. VALDRE, and P. MAKRI Structural modifications of smectites mechanically deformed under controlled conditions Clay Minerals, December 1, 2005; 40(4): 511 - 522. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Gaudin, M. D. Buatier, D. Beaufort, S. Petit, O. Grauby, and A. Decarreau CHARACTERIZATION AND ORIGIN OF Fe3+-MONTMORILLONITE IN DEEP-WATER CALCAREOUS SEDIMENTS (PACIFIC OCEAN, COSTA RICA MARGIN) Clays and Clay Minerals, October 1, 2005; 53(5): 452 - 465. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. G. DILL, S. KAUFHOLD, S. KHISHIGSUREN, and J . BULGAMAA Discovery and origin of a Palaeogene smectite-bearing clay deposit in the SE Gobi (Mongolia) Clay Minerals, September 1, 2005; 40(3): 351 - 367. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Gaudin, S. Petit, J. Rose, F. Martin, A. Decarreau, Y. Noack, and D. Borschneck The accurate crystal chemistry of ferric smectites from the lateritic nickel ore of Murrin Murrin (Western Australia). II. Spectroscopic (IR and EXAFS) approaches Clay Minerals, December 1, 2004; 39(4): 453 - 467. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. BISHOP, E. MURAD, and M. D. DYAR The influence of octahedral and tetrahedral cation substitution on the structure of smectites and serpentines as observed through infrared spectroscopy Clay Minerals, December 1, 2002; 37(4): 617 - 628. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
