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TitleEvaluating white mica as an indicator mineral for lithium bearing pegmatites, Wekusko Lake pegmatite field, Manitoba, Canada
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBenn, D; Linnen, R; Martins, T
SourceTargeted Geoscience Initiative 5: grant program final reports (2018-2020); by Targeted Geoscience Initiative Coordination Office; Geological Survey of Canada, Open File 8755, 2021 p. 45-58, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: grant program final reports (2018-2020)
RelatedThis publication is related to Evaluating portable Raman spectrometers for use in exploration of pegmatite dikes, Wekusko Lake, Manitoba
File formatpdf
NTS63J/12; 63J/13; 63K/09; 63K/16
AreaWekusko Lake
Lat/Long WENS-100.5000 -99.5000 55.0000 54.5000
Subjectseconomic geology; mineralogy; geochemistry; Science and Technology; Nature and Environment; mineral deposits; metals; lithium; mineralization; mineral exploration; exploration methods; mica; in-field instrumentation; equipment testing; spectrometric analyses; bedrock geology; lithology; igneous rocks; intrusive rocks; pegmatites; volcanic rocks; mafic volcanic rocks; metamorphic rocks; gneisses; intrusions; dykes; mineral zoning; textural analyses; electron microscope analyses; electron probe analyses; mass spectrometer analysis; whole rock analyses; potassium geochemistry; rubidium geochemistry; cesium geochemistry; Wekusko Lake Pegmatite Field; Green Bay Group; Snow Lake Block
Illustrationsgeoscientific sketch maps; location maps; photographs; photomicrographs; profiles; plots; spectra
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
Released2021 10 27
AbstractThis project investigates the potential use of white micas as an indicator mineral within Li-bearing pegmatites and the potential of field portable techniques, such as Raman spectroscopy and Laser Induced Breakdown Spectroscopy (LIBS) as real-time techniques in exploration. The pegmatites in the Wekusko Lake field, Manitoba, Canada, display five zones of varying mineralization. White micas display two textures in the field (primary igneous and secondary) and four textures were identified by backscattered electron imaging (poor zonation, rimmed, patchy and exsolution). The white micas were analysed by Electron Probe Micro-Analysis (EPMA) and Laser Ablation Induction-Coupled Plasma Mass Spectroscopy (LA-ICP-MS) and the results show a strong correlation in the Li content of the white mica and the whole rock Li2O obtained from the assays of drill core. The K/Rb vs. Cs contents of the white mica indicate that the most prospective dikes contain moderate to highly evolved grains. The use of portable Raman Spectrometer, while useful for mineral identification, was not able to detect a significant Li signature at the concentrations tested (1500-6000 ppm).
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques, which will result in more effective targeting of buried mineral deposits. This compendium is the result of the TGI Grant Recipients 2018-2020.

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