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Synchrotron-based IR microspectroscopy as a useful tool to study hydration states of meteorite constituents.

Moroz, L. V. and Schmidt, M. and Schade, U. and Hiroi, T. and Ivanova, M. (2006) Synchrotron-based IR microspectroscopy as a useful tool to study hydration states of meteorite constituents. Meteoritics and Planetary Science, 41, pp. 1219-1230.

Full text not available from this repository.

Abstract

We present the results of the infrared microscopic study of the anomalous carbonaceous chondrites Dhofar 225 and Dhofar 735 in comparison to typical CM2 chondrites Cold Bokkeveld, Murray, and Mighei. The FTIR 2.5-14 µm reflectance measurements were performed on conventional polished sections using an IR microscope with a synchrotron radiation source. We demonstrate that the synchrotron-based IR microspectroscopy is a useful non-destructive tool to study hydration states of meteorites constituents in situ. Our results show that the matrices of Dho 225 and Dho 735 are dehydrated compared to the matrices of typical CM2 chondrites. The spectra of the Dho 225 and Dho 735 matrices lack the 2.7-2.8 µm absorption feature present in the spectra of Cold Bokkeveld, Murray, and Mighei. Spectral signatures caused by Si-O vibrations in fine-grained Fe-rich olivines dominate the 10-µm spectral region in the spectra of Dho 225 and Dho 735 matrices, while the spectra of normal CM2 chondrites are dominated by spectral signatures due to Si-O vibrations in phyllosilicates. We did not detect any hydrated phases in the spectra of Dho 225 and Dho 735 polished sections. In addition, the near-infrared reflectance spectra of Dho 225 and Dho 735 bulk powders show spectral similarities to the Antarctic metamorphosed carbonaceous chondrites. We confirm the results of previous mineralogical, chemical, and isotopic studies indicating that the two meteorites from Oman are the first non-Antarctic metamorphosed carbonaceous chondrites.

Document Type:Article
Title:Synchrotron-based IR microspectroscopy as a useful tool to study hydration states of meteorite constituents.
Authors:
AuthorsInstitution or Email of Authors
Moroz, L. V.UNSPECIFIED
Schmidt, M.BESSY GmbH
Schade, U.BESSY GmbH
Hiroi, T.Brown University
Ivanova, M.Vernadsky Institute
Date:August 2006
Journal or Publication Title:Meteoritics and Planetary Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:41
Page Range:pp. 1219-1230
Status:Published
Keywords:meteorites, infrared, spectroscopy, reflectance
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W -- no assignement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Dr. Liubov Moroz
Deposited On:15 Dec 2006
Last Modified:27 Apr 2009 13:21

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