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TitrePortable X-ray fluorescence to optimize stream sediment chemistry and indicator mineral surveys, case 2: carbonatite-hosted REE deposits, Wicheeda Lake, British Columbia, Canada
AuteurMackay, D A R; Simandl, G J
SourceGeological Fieldwork 2013, British Columbia Geological Survey Paper 2014-1; British Columbia Ministry of Energy, Mines and Petroleum Resources, Paper no. 2014-1, 2013 p. 195-206
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120510
ÉditeurBritish Columbia Ministry of Energy, Mines and Natural Gas
Documentpublication en série
Lang.anglais
Mediapapier
Formatspdf
ProvinceColombie-Britannique
SNRC94B/05
Lat/Long OENS-122.1167 -122.0167 54.5333 54.5000
Sujetséléments d'indice; carbonatites
Illustrationslocation maps; plots; tables
ProgrammeÉtude des gîtes des métaux rares, Initiative géoscientifique ciblée (IGC-4)
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
The Wicheeda carbonatite-hosted deposit is one of the most promising rare earth element (REE) prospects within the British Columbia alkaline province. Portable X-ray fl uorescence (pXRF) allows for determination of several pathfinder elements (Nb, Ta, REEs, Th, Ba, and Sr) in stream sediment samples collected downstream of this deposit. These samples are expected to contain indicator minerals derived from the main carbonatite complex such as monazite, REE-bearing carbonates and fl uorocarbonates, pyrochlore, columbite-(Fe), barite-celestine, apatite, and others. Study of these samples indicates that the + 250 µm, + 125 µm, and + 63 µm size fractions contain high concentrations of Nb, La, Ce, and Th relative to other size fractions. The + 125 µm fraction was chosen for systematic chemical analyses and pathfi nder element studies. Although there is no noticeable decreasing trend in pathfi nder elements with increasing distance downstream, there is co-variation of Nb, Ta, La, Ce, Pr, Nd, Y, and Th. This refl ects the presence of multiple mineral phases including pyrochlore, monazite-(Ce), REE-fl uorocarbonates, and REE-carbonates. Mineralogical studies using optical microscopy, scanning electron microscopy (SEM), electron microprobe (EMP), and Quantitative Evaluation of Materials by Scanning electron microscopy (QEMSCAN) are required to identify and quantify minerals and their distributions downstream of the deposit.
GEOSCAN ID296098