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Duration of mineralization and fluid-flow history of the Upper Mississippi Valley zinc-lead district

January 1, 1995

Studies of fluid inclusions in sphalerite and biomarkers from the Upper Mississippi Valley zinc district show homogenization temperatures to be primarily between 90 and 150??C, yet show relatively low levels of thermal maturity. Numerical calculations are used to simulate fluid and heat flow through fracture-controlled ore zones and heat transfer to the adjacent rocks. Combining a best-fit path through fluid-inclusion data with measured thermal alteration of biomarkers, the time interval during which mineralizing fluids circulated through the Upper Mississippi Valley district was calculated to be on the order of 200 ka. Cambrian and Ordovician aquifers underlying the district, principally the St. Peter and Mt. Simon Sandstones, were the source of the mineralizing fluid. The duration of mineralization thus reflects the fluid-flow history of these regional aquifers. -from Authors

Citation Information

Publication Year 1995
Title Duration of mineralization and fluid-flow history of the Upper Mississippi Valley zinc-lead district
DOI
Authors E.L. Rowan, M.B. Goldhaber
Publication Type Article
Publication Subtype Journal Article
Series Title Geology
Series Number
Index ID 70018926
Record Source USGS Publications Warehouse
USGS Organization