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Open AccessArticle

Geochemical and Geochronological Discrimination of Biotite Types at the Detour Lake Gold Deposit, Canada

1
Department of Earth and Environmental Sciences, 150 Louis-Pasteur Private, University of Ottawa, Ottawa, ON K1N 9A7, Canada
2
Department of Geological Sciences, 240 Wallace Building, 125 Dysart Road, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
3
Natural Resources Canada (NRCan)/Geological Survey of Canada (GSC), 601 Booth St, Ottawa, ON K1A 0E8, Canada
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(10), 596; https://doi.org/10.3390/min9100596
Received: 28 August 2019 / Revised: 25 September 2019 / Accepted: 27 September 2019 / Published: 30 September 2019
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-calite 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 (≤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. View Full-Text
Keywords: biotite; gold; EMPA; 40Ar/39Ar geochronology; Superior Province biotite; gold; EMPA; 40Ar/39Ar geochronology; Superior Province
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Dubosq, R.; Schneider, D.A.; Camacho, A.; Lawley, C.J. Geochemical and Geochronological Discrimination of Biotite Types at the Detour Lake Gold Deposit, Canada. Minerals 2019, 9, 596.

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