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TitleOrigin of boron-rich fluids in the formation of unconformity associated deposits of the Sibley Basin
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKelly, C J; Davis, W JORCID logo; Potter, E GORCID logo; Metsaranta, R; Puumala, M
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 353-363, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
File formatpdf
NTS42D/02; 42D/03; 42D/04; 42D/05; 42D/06; 42D/07; 42D/10; 42D/11; 42D/12; 42D/13; 42D/14; 42D/15; 42E/02; 42E/03; 42E/04; 42E/05; 42E/06; 42E/07; 42E/10; 42E/11; 42E/12; 42E/13; 42E/14; 42E/15; 42L/02; 42L/03; 42L/04; 42L/05; 42L/06; 42L/07; 52A; 52H; 52I/01; 52I/02; 52I/03; 52I/04; 52I/05; 52I/06; 52I/07; 52I/08
AreaLake Nipigon; Lake Superior
Lat/Long WENS -89.8333 -86.7500 50.3333 48.1667
Subjectseconomic geology; geochemistry; tectonics; mineral deposits; unconformity-type deposit; uranium; mineral exploration; exploration methods; ore mineral genesis; mineralization; fluid dynamics; tourmaline; veins; isotopic studies; boron geochemistry; major element analyses; spectrometric analyses; petrographic analyses; electron microscope analyses; electron probe analyses; tectonic setting; hydrothermal systems; magmatism; metamorphic environment; deformation; basins; source rocks; crustal evolution; alteration; diabases; bedrock geology; basement geology; Archean; Sibley Basin; Athabasca Basin; Sibley Group; Quetico Subprovince; Innis Lake Showing; Malborne Lake Showing; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs; diagrams; tables; bar graphs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Uranium ore systems - fluid pathways
Released2019 03 01
AbstractHydrothermal magnesio-foitite or dravite (tourmaline) is common within the ore zones of unconformity associated uranium deposits globally. Magnesium-rich tourmaline ranging in composition from dravite to magnesio-foitite is identified in two uranium showings within the Sibley Basin. Hydrothermal dravite from the Malborne Lake showing (delta-11B = -22.5 permille to -20.2 permille) is significantly isotopically lighter than dravite and magnesio-foitite analyzed from the Innis Lake showing (delta-11B = 16.5-20.0 permille). The isotopically light delta-11B values of tourmaline from Malborne Lake is consistent with local metamorphic tourmaline, indicating that boron is primarily basement-derived. This contrasts with the isotopically heavy compositions of hydrothermal tourmaline from the Innis Lake showing that are comparable to values reported from the Athabasca Basin. A positive delta-11B value indicates that boron was sourced from, or potentially equilibrated with, the overlying marine evaporites, such as the chemical sediments of the Sibley Basin. The delta-11B values of hydrothermal tourmaline from the two occurrences are markedly different and suggest that vein-hosted mineralization in the basement rocks of the Sibley Basin did not form via a unique mechanism.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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