J.C. Wright
W. S. White
1966
<p><span>A zone, 1 to 50 feet thick, at the base of the </span>Nonesuch<span> </span>Shale<span>, is relatively rich </span>in<span> copper, chiefly as chalcocite. Pyrite is the characteristic </span>sulfide<span> </span>mineral<span> of the overlying 400 to 600 feet of the formation. The boundary of the cupriferous zone with the pyrite zone regionally transgresses both stratigraphic layering and fades gradations indicative of ancient environmental boundaries. The top of the cupriferous zone is marked by the upward sequence, chalcocite-bornite-chalcopyrite-pyrite, and by the cadmium </span>sulfide<span>, greenockite. The </span>sulfide<span> </span>zoning<span> does not appear to be syngenetic. The regional configuration of the cupriferous zone suggests, instead, that the copper was introduced after deposition of the entire 50-foot sequence of strata. The area </span>in<span> which the top of the cupriferous zone is stratigraphically highest is related spatially, and probably genetically, to a zone of wedging </span>in<span> the underlying Copper Harbor Conglomerate. </span></p>
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10.2113/gsecongeo.61.7.1171
en
Society of Economic Geologists
Sulfide-mineral zoning in the basal nonesuch shale, Northern Michigan
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