Géochimie et métallogénie des veines à Ag-Pb-Zn du bassin de Purcell, Colombie-Britannique
|Advisor:||Beaudoin, Georges; Paradis, Suzanne|
|Abstract:||The Belt-Purcell Basin hosts the world class Sullivan SEDEX deposit in British Columbia. The veins in the Purcell basin are classified in 3 different types: 1) Pb-Zn veins are composed of sphalerite, pyrrhotite, galena, freibergite and pyrite; 2) Pb-Ag-Au-Cu veins characterized by galena, pyrite, freibergite and gold whereas 3) Ag-Pb-Zn vein and replacement deposits are composed of sphalerite, galena, pyrite and freibergite. Hydrothermal sericite from the Type 3 Ptarmigan deposit yields an age of 133.1±0.7 Ma. Sulphur in Types 1 and 2 veins hosted in Lower Purcell sedimentary rocks results from leaching of bacteriogenic pyrite from clastic sedimentary rocks of the Aldridge Formation. Types 2 and 3 vein and replacement deposits hosted in the Upper Purcell rocks have sulphur that results from dissolution contained in the carbonate rocks of the Purcell Basin followed by thermochemical reduction. Types 1, 2 and 3 vein and replacement deposits are formed by metamorphic fluids generated at different times. Type 1 veins were formed by Proterozoic fluids whereas Types 2 and 3 vein and replacement deposits were formed during the Mesozoic. Type 1 Pb-Zn veins have a non-radiogenic Proterozoic lead. Type 2 and 3 vein and replacement deposits have a radiogenic Mesozoic lead signature.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||16 April 2018|
|Collection:||Thèses et mémoires|
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