Mineralogy, Mineral Chemistry and SWIR Spectral Reflectance of Chlorite and White Mica
نویسندگان
چکیده
Hyperspectral reflectance has the potential to provide rapid and low-cost mineralogical chemical information that can be used vector in mineral systems. However, spectral signature of white mica chlorite, despite numerous studies, is not fully understood. In this study, we review mineralogy chemistry different chlorite types investigate what changes are responsible for apparent shifts shortwave infrared (SWIR) spectroscopic absorption features. We demonstrate more complex than previously documented influenced by Tschermak substitution, as well sum interlayer cations. show an increase deficiencies towards illite associated with a change from steep shallow slopes between wavelength position 2200 nm feature (2200 W) Mg, Al(VI) Si. These slope imply micas elemental may same W values vice versa, contrary traditional interpretation. recommend interpretations should only true cations (I) > 0.95. The trioctahedral (clinochlore, sheridanite, chamosite ripidolite) record similar relationships those observed previous studies. dioctahedral Al-rich (sudoite, cookeite donbassite) response Mg increasing 2250 W, which opposite addition, it was shown introduce erroneous mixtures. Therefore, care when interpreting chlorite. studies complemented electron microprobe analyses on subset at least 30 samples identify type muscovite This will allow I obtained, estimate trends Al(vi), Preliminary probe data accurate user understand limitations their hyperspectral datasets.
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ژورنال
عنوان ژورنال: Minerals
سال: 2021
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min11050471