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Reflectance spectra of synthetic Fe-free ortho- and clinoenstatites in the UV/ VIS/IR and implications for remote sensing detection of Fe-free pyroxenes on planetary surfaces

Markus, K. and Moroz, L. and Arnold, Gabriele and Henckel, Daniela and Hiesinger, H. and Rohrbach, A. and Klemme, S. (2018) Reflectance spectra of synthetic Fe-free ortho- and clinoenstatites in the UV/ VIS/IR and implications for remote sensing detection of Fe-free pyroxenes on planetary surfaces. Planetary and Space Science, 159, pp. 43-55. Elsevier. DOI: 10.1016/j.pss.2018.04.006 ISSN 0032-0633

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Abstract

For a better spectral characterization of planetary bodies with enstatite-rich surfaces like Mercury or E-type asteroids, we synthesized two different enstatite (Mg2Si2O6) polymorphs: Orthoenstatite and clinoenstatite. Both enstatite polymorphs are known from the meteorite record and are commonly observed in aubrites and enstatite chondrites. The synthesized enstatites are particulate samples suitable for laboratory reflectance measurements and can be used for compositional modelling by preparing mixtures of samples in the laboratory or by using the sample's spectra in mathematical models. We report on the synthesis process, chemical composition, grain size distribution, and reflectance spectra of these synthetic enstatites covering the wavelength range from 0.25 to 17 μm, compare them to other pyroxenes (meteoritic enstatite and other synthetic enstatites and diopside), and discuss the implications of retrieving surface compositions of planetary bodies like E-type asteroids, comets, or Mercury. Both enstatite spectra are very bright in the VIS and NIR and show almost neutral to slightly bluish spectral slopes with a steep absorption in the UV. Very low iron in the enstatites (below ~0.04 wt% FeO) already results in weak albeit noticeable absorptions in the VNIR between 0.4 and 0.9 μm. Orthoenstatite and clinoenstatite are not distinguishable based only on their spectra in the VIS and NIR. At the Reststrahlen bands in the MIR a systematic difference in the number and exact position of local minima at ~10 μm between clinoenstatite and orthoenstatite is evident. This can be used to discern between the polymorphs in this wavelength range. Additionally, we can distinguish between Fe-free low- and high-Ca pyroxenes in the MIR.

Item URL in elib:https://elib.dlr.de/126042/
Document Type:Article
Title:Reflectance spectra of synthetic Fe-free ortho- and clinoenstatites in the UV/ VIS/IR and implications for remote sensing detection of Fe-free pyroxenes on planetary surfaces
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Markus, K.DLR, Institut für Planetenforschung, Berlin, Germany; Institut für Planetologie, Westfälische Wilhelms-Universität at Münster, GermanyUNSPECIFIED
Moroz, L.Institut für Erd- und Umweltwissenschaften, University of Potsdam, Potsdam, Germany; DLR, Institut für Planetenforschung, Berlin, GermanyUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Henckel, DanielaDaniela.Henckel (at) dlr.deUNSPECIFIED
Hiesinger, H.Institut für Planetologie, Westfälische Wilhelms-Universität Münster, GermanyUNSPECIFIED
Rohrbach, A.Institut für Mineralogie, Westfäische Wilhelms-Universität Münster, GermanyUNSPECIFIED
Klemme, S.Institut für Mineralogie, Westfäische Wilhelms-Universität Münster, GermanyUNSPECIFIED
Date:2018
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:159
DOI :10.1016/j.pss.2018.04.006
Page Range:pp. 43-55
Publisher:Elsevier
ISSN:0032-0633
Status:Published
Keywords:VNIR and MIR reflectance spectroscopy, iron-free pyroxenes, planetary surfaces
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 - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Arnold, Dr. Gabriele
Deposited On:18 Jan 2019 12:21
Last Modified:31 Jul 2019 20:23

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