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

Mid‐Infrared Spectroscopy of Sulfidation Reaction Products and Implications for Sulfur on Mercury

“…The mid-IR spectra of the synthetic Mercury glasses hMgI (ID 156, Figure 4d), hMgII (ID 181, only in data set, Renggli et al, 2023), lMgII A (ID 174, Figure 4e), and hAl (ID 155, Figure 4f) were previously described in Morlok et al (2021). The glass spectra are characterized by a reflectance minimum (CF) at low wavenumbers, and a broad reflectance maximum (Table 3).…”

“…The mid-IR reflectance spectra of the experimental run products show changes in their spectral features; in particular, we can identify quartz as a reaction product (e.g., Equations 1-3) spectroscopically. In silicate glasses and mineral mixtures, the CF (reflectance minimum) and the main RB are sensitive to the chemical composition, and in particular the SiO 2 content (Morlok et al, 2021(Morlok et al, , 2023. In the sulfidation reactions the minerals and glasses lose Ca and Mg to the sulfides (Equations 1-3).…”

“…For details on standardization and reference materials, we refer to the supplementary material in Renggli et al (2022). Major Oxide Compositions (wt.%) of the Three Glasses lMgII A, hMgl, and hAl (Morlok et al, 2021;Renggli et al, 2022), and the Minerals Olivine, Diopside (Kumamoto et al, 2017) The bulk and in situ FTIR reflectance spectra were recorded using a Bruker Hyperion 3000 microscope with a liquid nitrogen cooled MCT detector over a spectral range of 4,000-600 cm −1 and a spectral resolution of 4 cm −1 . In this study we discuss the features over the spectral range of 1,300-800 cm −1 and the reported spectra are the averages of 64 or 128 scans.…”

Mid‐Infrared Spectroscopy of Feldspars From the Bühl Basalt (Northern Hesse, Germany) Formed Under Reducing Conditions as Terrestrial Analogue of Mercury for MERTIS

“…To achieve the goals of MERTIS, it is necessary to build a spectral library of fully characterized samples of potential constitute minerals of Mercurys' surface and to study the behavior of mixtures of these minerals (Weber et al., 2018). Analog experiments and modal calculations with chemical compositions derived from MESSENGER data were performed (e.g., Morlok et al., 2021; Namur & Charlier, 2017) to identify potential mineral candidates.…”

Modeling Wavelength Dependent Mid‐Infrared (5.5–25 μm) Optical Constants of Silicate Glasses: A Genetic Algorithm Approach

“…Furthermore, the miniTES (Miniature TES) instruments (a miniaturized version of MGS-TES) onboard the Mars Exploration Rovers Spirit (2004Spirit ( -2011 and Opportunity (2004Opportunity ( -2018 have collected thermal emission spectra for over a decade of multiple target surfaces in hyperspectral mode with the highest spatial resolution of 8 mrad and capable of characterizing the sample size of 8 cm (Christensen et al, 2003(Christensen et al, , 2004bSilverman et al, 2006). Previous studies have investigated the MIR spectral behavior of a variety of glasses to support their detection from the orbit, which include glasses within tephra deposits (Leight et al, 2022), synthetic glasses of varying fugacity, bulk chemistry, and temperatures (Cannon et al, 2017), synthetic glasses analogous to materials on Mars (Minitti & Hamilton, 2010;Moroz et al, 2009) and Mercury (Morlok et al, 2021), volatiles within glasses (King & Larsen, 2013), synthetic basaltic glasses with varying SiO 2 , FeO content, Fe 3+ /Fe 2+ , and alkali elements (Dufresne et al, 2009), ternary glasses (Mocioiu et al, 2013), quartzofeldspathic glasses (Byrnes et al, 2007), and feldspathic and impact glass (Jaret et al, 2015(Jaret et al, , 2018Johnson et al, 2020).…”