| Titre | Geochemical and geochronological discrimination of biotite types at the Detour Lake Gold Deposit, Canada |
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| Auteur | 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  Accès ouvert |
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| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190561 |
| Éditeur | MDPI |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.3390/min9100596 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Ontario; Québec |
| SNRC | 31M; 31N; 31O; 32B; 32C; 32D; 32E; 32F; 32G; 32J; 32K; 32L; 41P; 42A; 42H; 42I |
| Région | Rouyn-Noranda; Timmins; Detour Lake; Chibougamau |
| Lat/Long OENS | -82.0000 -74.0000 50.5000 47.5000 |
| Sujets | gisements minéraux; or; minéralisation; genèse des minerais; biotite; faciès à amphibolite; cadre tectonique; datation radiométrique; datation argon-argon; filons; foliation; géochimie du titane;
géochimie du magnesium; Archéen; Province de Superior ; Paléoprotérozoïque; géologie économique; géochimie; géochronologie; Sciences et technologie; Nature et environnement; Précambrien; Protérozoïque |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; photographies; photomicrographies; graphiques; diagrammes ternaires; tableaux; graphique à barres; histogrammes |
| Diffusé | 2019 09 30 |
| Résumé | (disponible en anglais seulement)
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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