Figure 11. Reconstruction of seafloor volcanic events at times 1, 2 and 3 in the Marshall Zone. A series of sulfide lenses and vein systems formed mainly after the accumulation of rhyolite B, during the accumulation of volcaniclastic rhyolite A. The thicker upper part of the rhyolite A hangingwall is massive and lacks significant mineralization. Rhyolite A is overlain by thin maroon siltstones, then mafic to intermediate volcaniclastic turbidites and mafic sills of the Thelwood Formation.



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