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Mineralogical and Raman spectroscopy studies of natural olivines exposed to different planetary environments

Weber, I. and Böttger, Ute and Pavlov, S.G. and Jessberger, E. K. and Hübers, Heinz-Wilhelm (2014) Mineralogical and Raman spectroscopy studies of natural olivines exposed to different planetary environments. Planetary and Space Science, 104, pp. 163-172. Elsevier. DOI: 10.1016/j.pss.2014.08.016 ISSN 0032-0633

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Official URL: http://dx.doi.org/10.1016/j.pss.2014.08.016

Abstract

New lander missions to bodies of our solar system are coming up and thus new techniques are desirable for the in-situ investigation of planetary surface and near surface materials. During the last decade Raman spectroscopy has been developed to become an excellent laboratory tool for fast petrological and mineralogical investigation of terrestrial and extraterrestrial rocks. Consequently, Raman spectroscopy has successfully been proposed for operation on planetary surfaces. In the joint ESA and Roscosmos mission ExoMars a Raman Laser Spectrometer (RLS) will for the first time be applied in space to identify minerals and organic compounds in Martian surface rocks and soils. The present study aims to investigate the possible response of various environmental conditions to Raman spectra in preparation for the ExoMars mission, as well as other space missions in future. For our study we selected five natural olivines with different forsterite (Mg2SiO4) and fayalite (Fe2SiO4) compositions. Olivine as an important rockforming mineral of the Earth upper mantle and an abundant mineral in Martian meteorites is one of the key planetary mineral. The spectra were taken in various environmental conditions that include vacuum down to 10-6 mbar,8mbarCO2 atmosphere, and temperatures ranging between room temperature and ~ 8K resembling those on Mars as well as on the Moon and on asteroids. We have found that forsterite shows only small temperature-related shifts in Raman spectra at very low temperatures indicating relatively weak changes in the lattice modes. Fayalite demonstrates, in addition to temperature dependent changes in the lattice modes found for forsterite, modification of Raman spectra at low Stokes frequencies. This is an effect in the SiO4 internal modes that most probably is caused by the high amount of iron in the mineral structure, which triggers antiferromagnetic transition at low temperatures. No influence of a CO2 atmosphere on Raman spectra for the investigated rock- forming minerals has been observed at any pressure from ambient 1bardown to a few mbar.

Item URL in elib:https://elib.dlr.de/94660/
Document Type:Article
Title:Mineralogical and Raman spectroscopy studies of natural olivines exposed to different planetary environments
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Weber, I.Institute of Planetology, WWU Münster, GermanyUNSPECIFIED
Böttger, UteUte.Boettger (at) dlr.deUNSPECIFIED
Pavlov, S.G.sergeij.pavlov (at) dlr.deUNSPECIFIED
Jessberger, E. K.Institute of Planetology, University of MünsterUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:28 September 2014
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:104
DOI :10.1016/j.pss.2014.08.016
Page Range:pp. 163-172
Publisher:Elsevier
ISSN:0032-0633
Status:Published
Keywords:Raman spectroscopy, olivine, Mars, space missions, simulated planetaryconditions/ environments
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ExoMars
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Böttger, Dr.rer.nat. Ute
Deposited On:16 Jan 2015 13:33
Last Modified:31 Jul 2019 19:51

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