Infrared observations; Instrumentation; Mercury, surface; Mineralogy; Spectroscopy; Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] The MERTIS (MErcury Radiometer and Thermal Infrared Spectrometer) onboard of the BepiColombo ESA/JAXA mission to Mercury will map the surface of Mercury in the wavelength range of 7–14 μm and for the interpretation of these spectra a database of analog materials is needed. We analyzed bulk grain size fractions of a series of analog materials relevant to the distinct terranes of Mercury in diffuse reflectance in the mid-infrared (2.5 μm to 18 μm). Mineral mixtures cover a wide range of modal amounts of forsterite, enstatite, diopside and plagioclase, the resulting spectra can be divided into three distinct groups: (1) is dominated by a single glass feature, (2) by forsterite bands, and (3) by pyroxene bands. Despite often high contents, plagioclase features, are usually ‘overprinted’ by forsterite and pyroxene bands. Spectral parameter CF, an easy obtainable proxy for chemistry (SiO2) and polymerization (SCFM) places the hermean mixtures mostly in the intermediate and basaltic range. The correlation of parameters easily obtainable in remote sensing, Mg/Si ratio, and CF, allows differing materials from high-energy evaporation processes in impacts from such formed in igneous processes. Preliminary comparison with a spectrum covering most of the hermean surface shows some similarity with band positions of the Inter Crater Plain and Heavily Cratered Terrains (IcP-HCT) and High-Mg Northern Volcanic Plains (High-Mg NVP) mixtures, but none of our spectra is able to reproduce the remote sensing data entirely.
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
Namur, Olivier; Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
Klemme, Stephan; Institut für Mineralogie, Westfälische Wilhelms-Universität Universität Münster, Münster, Germany
Reitze, Maximilian P.; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany
Weber, Iris; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany
Stojic, Aleksandra N.; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany
Bauch, Karin E.; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany
Hiesinger, Harald; Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster, Germany
Helbert, Joern; Institute for Planetary Research, DLR, Berlin, Germany
Language :
English
Title :
A mid-infrared study of synthetic glass and crystal mixtures analog to the geochemical terranes on mercury
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE] DFG - Deutsche Forschungsgemeinschaft [DE] DLR - Deutsches Zentrum für Luft- und Raumfahrt [DE]
Funding text :
A.M., M.P.R., A.N.S., I.W. and H.H. are supported by the DLR grant 50QW1701 and 50QW2201A1302 . CR is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – project 442083018. BC is a Research Associate of the Belgian Fund for Scientific Research-FNRS. ON acknowledges support from the FWO through an Odysseus grant.
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