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Physical alteration of antigorite: a Mössbauer spectroscopy, reflectance spectroscopy and TEM study with applications to Mars

Published online by Cambridge University Press:  09 July 2018

J. L. Bishop ,
M. D. Dyar ,
E. C. Sklute  and
A. Drief
J. L. Bishop*
Affiliation:
SETI Institute/NASA-Ames Research Center, 515 N. Whisman Road, Mountain View, CA 94043, USA
M. D. Dyar
Affiliation:
Mount Holyoke College, 50 College Street, South Hadley, MA 01075, USA
E. C. Sklute
Affiliation:
Mount Holyoke College, 50 College Street, South Hadley, MA 01075, USA
A. Drief
Affiliation:
Clorox Services Company, 7200 Johnson Drive, Pleasanton, CA 94588, USA
*
*E-mail: Janice.L.Bishop@nasa.gov
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Abstract

Physical alteration of magnetite-bearing antigorite grains is investigated in this study using Mössbauer, visible/near-infrared (VNIR) and mid-IR spectroscopy coupled with scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses. An expected decrease in grain size with grinding is observed using SEM. The HRTEM images illustrate that the nanophase-sized grains which adhere to larger grains have 7 Å antigorite patterns. Mössbauer spectroscopy shows the presence of antigorite, magnetite and an amorphous phase. Visible/near infrared spectra exhibit features common in serpentine. These spectra also show an increasing continuum slope with grinding, an effect which is characteristic of thin coatings or tiny grains on surfaces. Mid-IR spectra indicate the formation of fine-grained Si-OH and carbonate in these samples with grinding.

Keywords

antigoritephysical alterationspectroscopyMössbauerreflectanceVNIRHRTEMSEMMars
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 1 , March 2008 , pp. 55 - 67
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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