Stable Isotope and Fluid Inclusion Study of Minor Upper Mississipi Valley-Type Sulfide Mineralization in Iowa, Illinois, and Wisconsin

摘要

The Upper Mississippi Valley (UMV) zinc-lead district, one of the largest mining districts in the United States, is surrounded by a broad zone of minor base metal mineralization which encompasses approximately 100,000 km(sup 2) in northwest Illinois, eastern Iowa, and southwest Wisconsin. Over 60 minor base metal occurrences of possible UMV type have been recognized in the outlying zone. However, a genetic link between the outlying mineralization and the ore deposits of the main UMV district has not been firmly established. Although many of the outlying mineral occurrences exhibit close similarities to the main UMV ore deposits, paragenetic, fluid inclusion, and stable isotope (S, C, O, and H) data suggest major differences in the genetic history of the outlying occurrences. (ERA citation 14:018461)