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TitlePortable X-ray fluorescence in stream sediment chemistry and indicator mineral surveys, Lonnie carbonatite complex, British Columbia
AuthorLuck, P; Simandl, G J
SourceGeological Fieldwork 2013, British Columbia Ministry of Energy and Mines, British Columbia Geological Survey Paper 2014-1; British Columbia Ministry of Energy, Mines and Petroleum Resources, Paper 2014-1, 2013 p. 169-182 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20120505
PublisherBritish Columbia Ministry of Energy, Mines and Natural Gas
File formatpdf
ProvinceBritish Columbia
NTS93I; 93J; 93K; 93N; 93O; 93P; 94A; 94B; 94C
AreaLonnie; Aley; Wicheeda; Granite Creek
Lat/Long WENS-126.0000 -120.0000 57.0000 54.0000
Subjectsniobium; rock analyses, rare earth elements; carbonatites; minerals; indicator elements
Illustrationslocation maps; photographs; tables; graphs
ProgramTargeted Geoscience Initiative (TGI-4) Rare-Metal Ore Systems
Released2013 01 01
AbstractThe Lonnie carbonatite complex is the third most developed Nb prospect in the British Columbia alkaline province. The objective of this study was to determine the best size fraction of stream sediments for carbonatite related indicator mineral surveys. Sediments from seven sites along Granite Creek, a stream that transects the Lonnie deposit and adjacent bedrock units, were sampled for pXRF and pathfi nder element studies. The results for key pathfi nder elements including Nb, Ta, La, Ce, Pr, Nd, Y, P, Sr, Ba, Th, and U were precise (most having %RSD less than 5%) and prone to bias. Results for eight size fractions separated by laboratory sieves indicated a systematic distribution of key elements, with the highest abundances found in the fi ner size fractions. Of these, the +125?m fraction was chosen for further consideration due to its suitability for continued indicator mineral studies. With the exception of Ba, Sr, and possibly Nb samples upstream from the Lonnie deposit display higher concentrations of carbonatite pathfi nder elements than samples downstream of the deposit. This indicates source(s) farther upstream, probably the Vergil carbonatite and Nb and TREE + Y soil geochemical anomalies. Indicator mineral studies are ongoing.

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