Métallogénie du gîte à PB-ZN-AG de Nicholas-Denys, Nouveau-Brunswick
|Authors:||Deakin, Michelle Kyle|
|Advisor:||Beaudoin, Georges; Malo, Michel|
|Abstract:||The Nicholas-Denys Pb¬¬¬–Zn–Ag deposit, located in the Bathurst Mining Camp (New Brunswick), consists of several pyrrhotite–sphalerite–galena sulphide lenses hosted by black mudstone of the Millstream Formation of the Fournier Group, deposited in an Ordovician backarc basin. The Nicholas-Denys sulphide lenses are conformable to the bedding-parallel S1 regional foliation, and are sheared parallel to the Rocky Brook-Millstream shear zone, indicating a pre-Devonian deformation timing for mineralization. Reduced sulphur for Nicholas-Denys sulphides comes from bacterial reduction of Ordovician seawater sulphates in a system open to sulphates under dysoxic to anoxic bottomwater conditions, with addition of magmatic sulphur from underlying mafic volcanic rocks. Lead was leached from the backarc basin sediments of the Millstream Formation mudstone and from underlying synvolcanic gabbros. The mineralizing fluid for Nicholas-Denys sulphides was reduced and acidic, favourable for precipitation of a pyrrhotite-rich mineralization. Characteristics of the Nicholas-Denys deposit are compatible with a SEDEX-type classification.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||18 April 2018|
|Collection:||Thèses et mémoires|
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