Abstract
Lower Jurassic (LJr) Hazelton Group (HG) volcanic and volcaniclastic rocks underlie much of the Cambria Icefield area and host LAC Minerals' Red Mountain Au deposit. They occur with similar Upper Triassic and older rocks in a structural culmination outlined by the contact between competent felsic and mafic volcanic rocks of uppermost Hazelton Group and overlying, relatively incompetent late Lower Jurassic and younger, westerly-derived clastic rocks. Stratigraphy of Hazelton Group is complex, but locally traceable units show that Lower Jurassic stratigraphy helped localize mid-Cretaceous(?) structure. The newly-recognized mafic-felsic association in upper Hazelton Group has significant exploration and tectonic implications. Plutonic styles suggest the age and exploration potential of plutons be reconsidered. Genesis of the Red Mountain deposit has yet to be firmly established, but the main mineralizing event predated regional deformational events, implying significant stratigraphic control and potential in the area mapped, and areas nearby, for similar deposits.
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