elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Reflectance Spectroscopy of Ferric Sulfate-Bearing Montmorillonites as Mars Soil Analog Materials

Bishop, J. and Pieters, C.M.(1) and Burns, R.G.(2) and Edwards, J.O.(3) and Mancinelli, R.L.(4) and Fröschl, H.(5) (1995) Reflectance Spectroscopy of Ferric Sulfate-Bearing Montmorillonites as Mars Soil Analog Materials. Icarus, pp. 101-119. Academic Press, San Diego, USA.

Full text not available from this repository.

Abstract

Spectroscopic analyses have shown that smecthites enhanced in the laboratory with additionalferric species exhibitimportant similarities to those of the soils on MArs. Ferrihydrite in these chemically treated smectites has features in the visible to near- infrared region that resemble the energies and band strengths of features in reflectance spectra observed for several bright regions on Mars. New samples have been prepared with sulfate as well, becauseS was found by Viking to be a major component in the surface materialon MArs. A suite of ferrihydrite-bearing and ferric sulfate-bearing montmorillonites, prepared with variable Fe3+ and S concentrations and variable pH conditions, has been analyzed using reflectance spectroscopy in the visible and infrared regions, Moessbauer spectroscopy at room temperature and 4 K, differential thermal analysis, and X-ray diffraction. These analyses support the formationof ferrihydrite of variable crystallinity in the ferrihydrite-bearingmontmorillonites and a combination of schwertmannite and ferrihydritein the ferric sulfate-bearing montmorillonites. Small quantities of poorly chrystalline and nanophase forms of other ferric materials mayalso be present in these samples. The chemical formation conditions of the ferrihydrite-bearing and ferric sulfate-bearing montmorillonites influence the character of the low temperature moessbauer sextets and the visible reflectance spectra. An absorptionminimum is observed at 0.88-0.89 muem in spectra of the ferric sulfate-bearing samples, and at 0.89-0.92 muem in spectra of the ferrihydrite-bearing montmorillonites. Moessbauer spectra of the ferric sulfate-bearing montmorillonites indicate variable concentrations of ferrihydrite and schwertmannite in the interlaminarspaces and along grain surfaces.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1995,
Title:Reflectance Spectroscopy of Ferric Sulfate-Bearing Montmorillonites as Mars Soil Analog Materials
Authors:
AuthorsInstitution or Email of Authors
Bishop, J.UNSPECIFIED
Pieters, C.M.(1)UNSPECIFIED
Burns, R.G.(2)UNSPECIFIED
Edwards, J.O.(3)UNSPECIFIED
Mancinelli, R.L.(4)UNSPECIFIED
Fröschl, H.(5)UNSPECIFIED
Date:1995
Journal or Publication Title:Icarus
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 101-119
Publisher:Academic Press, San Diego, USA
Series Name:117
Status:Published
Keywords:Mars, spectroscopy, analogs
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:UNSPECIFIED
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Institut für Planetenerkundung
Deposited By: elib DLR-Beauftragter
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 09:48

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.