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TitleIndicator mineral studies at the Brazil Lake LCT Pegmatites, southwest Nova Scotia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMcClenaghan, M BORCID logo; Brushett, D M; Beckett-Brown, C EORCID logo; Paulen, R CORCID logo; Rice, J M; Haji Egeh, A; Nissen, A
SourceGeological Survey of Canada, Scientific Presentation 157, 2023, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
MeetingAtlantic Geoscience Society Colloquium; Truro; CA; February 3-4, 2023
Mediadigital; on-line
RelatedNRCan photo(s) in this publication
File formatpdf
ProvinceNova Scotia
AreaBrazil Lake
Lat/Long WENS -66.2500 -65.7500 44.2500 43.7500
Subjectsgeochemistry; general geology; surficial geology/geomorphology; indicator elements; pegmatites; lithium; cesium; tantalum; bedrock geology
Illustrationslocation maps; photographs
ProgramTargeted Geoscience Initiative (TGI-6) Ore systems
Released2023 03 23
Indicator mineral research is currently being undertaken in partnership with the Nova Scotia Department of Natural Resources and Renewables at the Brazil Lake lithium-cesium-tantalum (LCT) pegmatites in southwest Nova Scotia as part of the Geological Survey of Canada's Targeted Geoscience Initiative(TGI) program. The pegmatites, discovered in 1960, are well known from previous detailed bedrock mapping and surficial studies, and are informally named based on their relative geographic positions as the South and North pegmatites. The South pegmatite naturally outcrops, and both pegmatites are surrounded by spodumene-rich boulders on the surface of the thin-till covered (<4 m) drumlinized glacial landscape. For these reasons, the pegmatites are excellent sites to test indicator mineral exploration methods for Li and associated critical elements (e.g. Ce, Ta). Five pegmatite samples were collected for detailed study and analysis of potential indicator minerals. Close to the pegmatite and up to 13 km down ice (south-southeast), 87 bulk (10-14 kg), till sediment samples were collected for indicator mineral analysis. A total of 105 till samples were collected around the pegmatite and across the region for matrix geochemistry. A preliminary list of indicator minerals includes mid-density (e.g., spodumene, tourmaline, blue apatite) and high-density mineral species (e.g., columbite-tantalite, cassiterite) and this list is expected to expand as the detailed studies progress. Trenches dug in the Fall 2022 to collect till samples on the proximal down ice (south) sides of both pegmatites revealed abundant spodumene pebbles and small cobbles in the till, indicating that the local till should display strong indicator mineral and matrix geochemical signatures derived from the pegmatites.
Summary(Plain Language Summary, not published)
This scientific presentation summarizes ongoing research by the Geological Survey of Canada on the indicator mineral signature of lithium-bearing pegmatites in glaciated terrain. The test site for this study is the Brazil Lake pegmatites in Nova Scotia.

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