The rocks of the Precambrian igneous basement that underlie the Viburnum Trend fundamentally affected the formation of stratabound lead-zinc-copper deposits in the Bonneterre Formation. The tectonic evolution of the basement provided the regional structural control for the emplacement of ore deposits. Rejuvenated Precambrian faults influenced local concentrations of orebodies in the mineralized trends and of ore minerals within the orebodies. The basement strongly influenced the sedimentary facies pattern, the development of fringing algal reefs, and the distribution of primary and superimposed permeability in the Bonneterre Formation. The basement provided an aquiclude surface which guided brines toward structurally, lithologically, and chemically favorable traps in the overlying porous and permeable sediments. Furthermore, brines, hydrodynamically propelled toward areas of lesser pressures from deeper sedimentary areas, leached metals from the Precambrian rocks, and their sedimentary derivatives thereby generated a unique copper-nickel-cobalt, radiogenic lead-rich mineral paragenesis.

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