Mid‐Infrared Spectroscopy of Anorthosite Samples From Near Manicouagan Crater, Canada, as Analogue for Remote Sensing of Mercury and Other Terrestrial Solar System Objects

Abstract

Low impact shock with proposed impact melt influences Al,Si order of plagioclases 12 • Grinding of rocks leads to modal changes of the minerals 13 • Potential plagioclases with reduced degree of Al,Si order on the surface of Mer-14 cury 15

A Micro Mid‐Infrared Spectroscopic Study of Chang’e‐5 Sample

“…The RB features are determined by both the chemical composition and the degree of Al,Si order of the plagioclase sample. The impact or post impact heating may reduce the degree of Al,Si order of the plagioclase sample (Reitze et al., 2021a). For the identified 9 PLG samples, only the spectra of grains 33, 32, 22, and 52 have clear and strong RB features in the 8.0–12 μm region, whereas the other PLG spectra seem to be deformed, possibly caused by the orientation or fragmentation or shock induced vitrification of the crystal.…”

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

“…ID 385 consists of two areas with different color occurrence (one brighter, one darker), which were separated (ID 390 and ID 391), crushed and sieved to analyze potential spectral differences for these two areas. By applying this procedure to a sample, it must always be considered, that during crushing different mineral phases behave differently (e.g., Reitze et al., 2021a). Some phases may break up easier than others, especially minerals with a clear and good cleavage like feldspar.…”

“…Accordingly, the mafic minerals shift the CF of rock spectra to longer wavelength (e.g., Salisbury & Walter, 1989). Within the smaller grain size fractions the plagioclase component is supposed to be enriched (Reitze et al., 2021a; Taylor et al., 2001). In addition, the CF of the finer fractions of pure plagioclase spectra is shifted toward longer wavelengths under a simulated lunar environment under high vacuum (Shirley & Glotch, 2019).…”

“…In addition, the exact position of the CF can be masked by the measuring device (Salisbury & D'Aria, 1989). Therefore, the exact dependency of the CF from the An-content is possibly debatable (e.g., Reitze et al, 2021a) and depends on various factors like grain size, and environmental conditions (e.g., Donaldson Hanna et al, 2012;Shirley & Glotch, 2019). Applying the dependency of the CF from the An-content provided by Conel (1970) to feldspars described by Irmer (1920) should lead to a CF between 7.84 μm (1,276 cm −1 , An 50 ) to 7.92 μm (1,263 cm −1 , An 70 ) up to 8.01 μm (1,249 cm −1 , An 90 ).…”

“…Wavelength in micrometer. Reference spectra for plagioclase seeReitze et al (2021b), for phyllosilicates see the USGS spectral database(Kokaly et al, 2017), for example, siderophyllite NMNH104998 and chlorite HS197.3B, for pyroxene and plagioclase dominated rock spectraReitze et al (2021a).…”