Fluid-inclusion studies of regionally extensive epigenetic dolomites, Bonneterre Dolomite (Cambrian), southeast Missouri: Evidence of multiple fluids during dolomitization and lead-zinc mineralization

Abstract

Research Article| June 01, 1992 Fluid-inclusion studies of regionally extensive epigenetic dolomites, Bonneterre Dolomite (Cambrian), southeast Missouri: Evidence of multiple fluids during dolomitization and lead-zinc mineralization KEVIN L. SHELTON; KEVIN L. SHELTON 1Stable Isotope Geology and Geochemistry Group, Department of Geological Sciences, University of Missouri-Columbia, Columbia, Missouri 65211 Search for other works by this author on: GSW Google Scholar RITA M. BAUER; RITA M. BAUER 1Stable Isotope Geology and Geochemistry Group, Department of Geological Sciences, University of Missouri-Columbia, Columbia, Missouri 65211 Search for other works by this author on: GSW Google Scholar JAY M. GREGG JAY M. GREGG 2Department of Geology and Geophysics, University of Missouri-Rolla, Rolla, Missouri 65401 Search for other works by this author on: GSW Google Scholar Author and Article Information KEVIN L. SHELTON 1Stable Isotope Geology and Geochemistry Group, Department of Geological Sciences, University of Missouri-Columbia, Columbia, Missouri 65211 RITA M. BAUER 1Stable Isotope Geology and Geochemistry Group, Department of Geological Sciences, University of Missouri-Columbia, Columbia, Missouri 65211 JAY M. GREGG 2Department of Geology and Geophysics, University of Missouri-Rolla, Rolla, Missouri 65401 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1992) 104 (6): 675–683. https://doi.org/10.1130/0016-7606(1992)104<0675:FISORE>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation KEVIN L. SHELTON, RITA M. BAUER, JAY M. GREGG; Fluid-inclusion studies of regionally extensive epigenetic dolomites, Bonneterre Dolomite (Cambrian), southeast Missouri: Evidence of multiple fluids during dolomitization and lead-zinc mineralization. GSA Bulletin 1992;; 104 (6): 675–683. doi: https://doi.org/10.1130/0016-7606(1992)104<0675:FISORE>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Sources of basinal fluids that precipitated the dolomite-hosted Mississippi Valley-type orebodies of southeast Missouri historically have been a subject of debate. This study presents microthermometric data for fluid inclusions in the regionally extensive epigenetic dolomite at the base of the ore-hosting Bonneterre Dolomite and in gangue dolomite of the Viburnum Trend Pb-Zn district. Samples of epigenetic dolomite cover an area of more than 25,000 km2 west of the St. Francois Mountains and permit determination of regional variations of temperature and composition of the mineralizing fluids and possible fluid interactions.Homogenization temperature-ice-melting relationships (temperature-salinity) among these inclusions document at least two end-member fluid components: a warmer, less saline fluid (120 to 187 °C; 5 wt% equiv. NaCl) and a cooler, more saline fluid (60 to 80 °C; >30 wt% equiv. NaCl). Intermediate temperatures and fluid compositions indicate that the end-member fluids likely mixed as they flowed through the region. Mixing was not confined to a stationary front but occurred throughout the study area. Comparison of homogenization temperatures to distance from possible basinal fluid sources indicates no discernible temperature gradient over the >25,000 km2 study area. The data are interpreted to indicate multiple basinal-fluid interactions coeval with dolomitization and associated Pb-Zn ore formation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.