| Title | Origin of boron-rich fluids in the formation of unconformity associated deposits of the Sibley Basin |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Kelly, C J; Davis, W J ; Potter, E G; Metsaranta, R; Puumala, M |
| Source | Targeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 353-363, https://doi.org/10.4095/313670  Open Access |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative: 2018 report of activities |
| File format | pdf |
| Province | Ontario |
| NTS | 42D/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 |
| Area | Lake Nipigon; Lake Superior |
| Lat/Long WENS | -89.8333 -86.7500 50.3333 48.1667 |
| Subjects | economic 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 |
| Illustrations | location maps; geoscientific sketch maps; photographs; photomicrographs; diagrams; tables; bar graphs |
| Program | Targeted Geoscience Initiative (TGI-5) Knowledge Management Coordination |
| Program | Targeted Geoscience Initiative (TGI-5) Uranium ore systems - fluid pathways |
| Released | 2019 03 01 |
| Abstract | Hydrothermal 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. |
| GEOSCAN ID | 313670 |
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