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Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates

David J. Turner, Benoit Rivard and Lee A. Groat
Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates
American Mineralogist (July 2014) 99 (7): 1335-1346

Abstract

An understanding of the mineralogy and petrogenesis of rare earth element deposits has significant implications for their economic viability. Lanthanide-bearing compounds are known to produce sharp absorption features in the visible to short-wave infrared region (VIS-SWIR), however, a significant knowledge gap exists between the fields of hyperspectral reflectance spectroscopy and rare earth element mineralogy. Reflectance spectra were collected from four bastnasite samples, two parisite samples, and one synchysite sample from the visible into the short-wave infrared. These REE fluorocarbonate mineral samples were characterized via scanning electron microscopy and electron probe microanalysis. Sharp absorptions of REE-bearing minerals are mostly the result of 4f-4f intraconfigurational electron transitions and for the light REE-enriched fluorocarbonates, the bulk of the features can be ascribed to Nd (super 3+) , Pr (super 3+) , Sm (super 3+) , and Eu (super 3+) . The lanthanide-related spectral responses of the REE fluorocarbonates are consistent across the group, supporting the notion that the REE cation site is very similar in each of these minerals. Carbonate-related spectral responses differed between these minerals, supporting the notion that the crystallographic sites for the carbonate radical differ between bastnasite, synchysite, and parisite. Exploitable spectral differences include a distinct absorption band at 2243 nm that separates bastnasite from synchysite and parisite. Similarly, for bastnasite a dominantly Pr (super 3+) -related absorption band located is at 1968 nm, while in synchysite and parisite it occurs at 1961 nm.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 7
Title: Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates
Affiliation: University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada
Pages: 1335-1346
Published: 201407
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 33
Accession Number: 2014-058168
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: University of Alberta, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201431
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