Visible and short-wave infrared reflectance spectroscopy of selected REE-bearing silicate minerals.
In: American Mineralogist, Jg. 103 (2018-06-01), Heft 6, S. 927-943
academicJournal
Zugriff:
Natural samples of the rare earth element (REE)-bearing silicate minerals cerite, mosandrite, kainosite, zircon, and eudialyte were studied using reflectance spectroscopy in the visible to short-wave infrared regions (500 to 2500 nm) and further characterized by scanning electron microscopy and electron microprobe analysis. Spectral features of these minerals are driven primarily by 4 f -4 f intraconfigurational electronic transitions of trivalent lanthanides, as well as 5 f -5 f electronic transitions of uranium and vibrational overtones and combinations of H2O and OH–. Spectra of eudialyte are also impacted by relative amounts of IVFe2+ and VFe2+. Respective spectra of these REE-bearing silicate minerals are sufficiently distinct to enable spectral classification. Spectral variability (e.g., band depths and locations) of some specific REE-related absorptions, such as an Er3+- and Yb3+-related absorption near 978 nm and Nd3+-related absorptions near 746, 803, and 875 nm, are interpreted to be driven by cation site differences in the crystal structures. This work adds to the growing understanding of REE-bearing mineral reflectance spectroscopy, which facilitates detection, identification, and quantification of REE-bearing silicate minerals in remote sensing applications. This is especially relevant for hyperspectral imaging spectroscopy with high spatial resolutions where the spectral response of a pixel becomes increasingly dominated by mineralogy rather than lithology. [ABSTRACT FROM AUTHOR]
Titel: |
Visible and short-wave infrared reflectance spectroscopy of selected REE-bearing silicate minerals.
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Autor/in / Beteiligte Person: | Turner, David J. ; Rivard, Benoit ; Groat, Lee A. |
Zeitschrift: | American Mineralogist, Jg. 103 (2018-06-01), Heft 6, S. 927-943 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 0003-004X (print) |
DOI: | 10.2138/am-2018-6195 |
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