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Economic Geology GSW 2008 Users' Group Meeting
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Economic Geology; May 1969; v. 64; no. 3; p. 342-346
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Age and genesis of quartz porphyry near White Pine, Michigan

Elwood R. Brooks, and Phillip L. Garbutt

A large body of quartz porphyry 5-8 miles south of White Pine is extrusive, and its contact with the overlying rocks is at least a local unconformity. It lies stratigraphically far below the Nonesuch Shale, and therefore cannot be a source for the solutions that introduced the copper. The Rb/Sr age reported by Chaudhuri and Faure (1967) for the quartz porphyry is younger than the age reported for rocks higher in the section, and one or the other age is therefore anomalous.

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