Voisey’s Bay Type Deposits The Giles Complex displays several characteristics that highlight its potential for magmatic Ni-Cu deposits.
The Giles Complex (~1080 Ma) is an extensive voluminous mafic-ultramafic intrusive sequence that is scattered over an area of some 2500km2 The layered mafic-ultramafic bodies experienced a multiple-phase history The E-W trending Mann-Hinckley Fault and pre-existing N to N-NE trending deep basement structures are crustal scale fractures that were active around the time of the emplacement of the Giles Complex (1080 Ma) and could potentially have been the corridor that allowed for the emplacement of a Ni-Cu bearing upper mantle melt component the Giles Complex The interaction of later stage olivine-dolerite dykes/sills with earlier peridotites, gabbros and troctolites has the potential to form Voisey Bay style Ni-Cu mineralisation The Giles Complex also exhibits a series of vertically stacked magma chambers and associated feeder dykes that could potentially act as traps for the immiscible Ni-Cu sulphides The emplacement of the melts coincided with an extensional period during granulite facies metamorphism Massive and disseminated nickel and copper sulphides intersected during recent work by WMC on the WA side of the Musgrave Province (Nebo and Babel) are believed to be associated with the later stage dolerite dykes of the Giles Complex intrusions indicating that Ni-Cu mineralisation processes where occurring during the emplacement of the Giles Complex
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