| Title | Geochemical and geochronological discrimination of biotite types at the Detour Lake Gold Deposit, Canada |
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| Author | Dubosq, R; Schneider, D A; Camacho, A; Lawley, C J M |
| Source | Minerals vol. 9, no. 10, 596, 2019 p. 1-22, https://doi.org/10.3390/min9100596  Open Access |
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| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20190561 |
| Publisher | MDPI |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Ontario; Quebec |
| NTS | 31M; 31N; 31O; 32B; 32C; 32D; 32E; 32F; 32G; 32J; 32K; 32L; 41P; 42A; 42H; 42I |
| Area | Rouyn-Noranda; Timmins; Detour Lake; Chibougamau |
| Lat/Long WENS | -82.0000 -74.0000 50.5000 47.5000 |
| Subjects | economic geology; geochemistry; geochronology; Science and Technology; Nature and Environment; mineral deposits; gold; mineralization; ore mineral genesis; biotite; amphibolite facies; tectonic setting;
radiometric dating; argon argon dating; veins; foliation; titanium geochemistry; magnesium geochemistry; Archean; Detour Lake Deposit; Superior Province; Paleoproterozoic; Neoarchean; Precambrian; Proterozoic |
| Illustrations | location maps; geoscientific sketch maps; photographs; photomicrographs; plots; ternary diagrams; tables; bar graphs; histograms |
| Released | 2019 09 30 |
| Abstract | The Detour Lake deposit is at a faulted contact between mafic volcanic and siliciclastic to volcaniclastic rocks, differing from other orogenic Au deposits in the dominantly greenschist facies Abitibi
region, by possessing amphibolite facies assemblages. Consequently, typical indicator minerals for mineralization, like secondary biotite, may not be useful for locating ore zone, due to the challenge of distinguishing hydrothermal versus metamorphic
and magmatic phases. Herein, geochemical and 40Ar/39Ar geochronological data are presented for biotite from mineralized and barren (distal) magmatic rocks to characterize potential geochemical and geochronological variations between biotite types.
Petrological observations reveal four biotite types: (1) Biotite hosted in mineralized, sulphidized quartz-calcite veins, (2) halo biotite at the margins of the aforementioned veins; (3) host rock biotite defining the foliation within the mafic
volcanic rocks of the deposit; and (4) biotite defining the foliation within the barren meta-plutonic host rocks. Chemical analysis reveals a lower Ti- and higher Mg-content of mineralized biotite types, indicative of secondary hydrothermal
processes. 40Ar/39Ar ages for all biotite types (2600-2390 Ma) post-date the main syn-deformation mineralization event at Detour Lake (less than or equal to 2700 Ma). These results suggest chemical variations within biotite are due to a
post-mineralization hydrothermal event, thus biotite should be used cautiously as a vector for gold mineralization in amphibolite facies terranes. |
| GEOSCAN ID | 321880 |
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