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Geology; September 2000; v. 28; no. 9; p. 795-798; DOI: 10.1130/0091-7613(2000)28<795:TBFMPF>2.0.CO;2
© 2000 Geological Society of America
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Temporal benchmarks for modeling Phanerozoic flow of basinal brines and hydrocarbons in the southern Midcontinent based on radiometrically dated calcite

Raymond M. Coveney, Jr.1, Virginia M. Ragan2 and Joyce C. Brannon3

1 University of Missouri, Kansas City, Missouri 64110, USA
2 Maple Woods Community College, Kansas City, Missouri 64156, USA
3 Washington University, St. Louis, Missouri 63130, USA

Fluid-inclusion studies of radiometrically dated (U/Pb, Th/Pb) calcite samples document the presence of hydrothermal fluids at ca. 251, 137, 67, and probably 39 Ma within the Tri-State Zn-Pb mining district of Missouri, Kansas, and Oklahoma. Fluid inclusions indicate minimum temperatures and equivalent salinities ranging from highs of 122 °C and 24 wt% NaCl ca. 251 Ma to lows of 52 °C and 0 wt% NaCl ca. 39 Ma. The two earliest calcites contain primary petroleum inclusions, but these are absent in samples younger than ca. 137 Ma. When combined with information on metal-rich shales, paleomagnetism, and modern groundwater flow, our results are most readily explained by periodic influxes of hydrothermal fluids of diverse compositions for >200 m.y. and sporadic migration of hydrocarbons for at least 100 m.y. in the southern Midcontinent.

Key Words: fluid inclusions • U/Pb • Th/Pb dating • Tri-State lead-zinc ores • hydrocarbons • regional fluid flow




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