Mid-infrared reflectance spectroscopy of synthetic glass analogs for mercury surface studies

[en] We have synthesized and analyzed by mid-infrared reflectance spectroscopy silicate glasses that are representative for the glasses on the surface of Mercury. The glass compositions are based on high-pressure laboratory experiments and the resulting compositions of the glass phase. The spectra are of interest for investigating the surface of Mercury using the MERTIS (Mercury Radiometer and Thermal Infrared Spectrometer) instrument on board of the ESA/JAXA BepiColombo mission. Both powdered fractions and polished blocks have been analyzed. Powdered size fractions of 0–25 μm, 25-63 μm, 63-125 μm, and 125–250 μm were measured in reflectance in the thermal infrared (2–20 μm). Spectra for powdered bulk glasses (1.6 wt% - 19.0 wt% MgO) show a single, dominating Reststrahlenband (RB, 9.3–9.8 μm), a Christiansen Feature (CF; 7.6 μm - 8.1 μm), and a size dependent Transparency Feature (TF; 11.6–11.9 μm). Micro-FTIR analyses of polished blocks of glasses (3.4–26.5 wt% MgO) have characteristic bands at 7.8–8.2 μm (CF), and 9.3–9.9 μm (RB). Only few olivine crystalline features were observed. Spectral features correlate with compositional characteristics, e.g. SiO2 content or SCFM (SiO2/(SiO2 + CaO + FeO + MgO) index. The strongest correlation between band features CF and the strong RB are with Mg/Si. No simple mixture of glass spectra from this study is able to reproduce the entire ground based spectrum of the surface of Mercury. However, Mg-rich glasses reproduce identified features at 8.5 μm, 9.9 μm and 12.4 μm.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Morlok, Andreas; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany

Renggli, Christian; Institut für Mineralogie, Westfälische Wilhelms-Universität Universität Münster, Münster, Germany

Charlier, Bernard ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique

Reitze, Maximilian P.; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany

Klemme, Stephan; Institut für Mineralogie, Westfälische Wilhelms-Universität Universität Münster, Münster, Germany

Namur, Olivier; Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium

Sohn, Martin; Hochschule Emden/Leer, Emden, Germany

Martin, Dayl; European Space Agency, Oxfordshire, United Kingdom

Weber, Iris; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany

Stojic, Aleksandra N.; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany

More authors (7 more)

Language :

English

Title :

Mid-infrared reflectance spectroscopy of synthetic glass analogs for mercury surface studies

Publication date :

June 2021

Journal title :

Icarus

ISSN :

0019-1035

eISSN :

1090-2643

Publisher :

Academic Press Inc.

Volume :

361

Pages :

114363

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://api.elsevier.com/content/article/PII:S0019103521000579?httpAccept=text/xml

Funders :

Royal Society
SNF - Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung
F.R.S.-FNRS - Fonds de la Recherche Scientifique
DLR - Deutsches Zentrum für Luft- und Raumfahrt
STFC - Science and Technology Facilities Council

Funding text :

C.R. was supported by a SNF postdoctoral fellowship.K.H.J. was supported by the UK Science and Technology Facilities Council (ST/M001253/1) and the Royal Society (RS/UF140190).This work was supported by DLR grant 50 QW 1302/1701 in the framework of the BepiColombo mission (A.M.,I.W.,A.N.S.,M.P.R., K.E.B., J.H.)B.C. is a Research Associate of the Belgian Fund for Scientific Research-FNRS and acknowledges support by the FNRS Incentive Grant 31,230,854.

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since 11 November 2023

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