Geochemical investigations of the Woodford–Chattanooga and Fayetteville Shales: Implications for genesis of the Mississippi Valley–type zinc–lead ores in the southern Ozark Region and hydrocarbon exploration

Radiogenic Pb Enrichment of Mississippi Valley-Type Metallic Ore Deposits, Southern Ozarks: Constraints Based on Geochemical Studies of Source Rocks and Their Diagenetic History

“…Geochemical studies indicate that the Mississippi Valley-type (MVT) ores were produced from a mixing and cooling of these sedimentary, basinal brines by associated meteoric or connate waters [4]. Previous investigations of the mid-continent MVT Pb and Zn mineralization (Figure 1) have been conducted, resulting in a large amount of geological and geochemical data, as well as numerous theories as to the source of the MVT ore metals and mineralizing fluids [5][6][7][8][9][10]. In the Ozark region, the linear trend defined by the Pb isotope compositions of the MVT ores suggest their formation involved a mixing of metals from two end-member components [7][8][9][10].…”

“…Extensive geochemical studies of rocks from the southern Ozark region and the Ouachita Mountains (Figure 1) have been carried out in order to constrain the two end-member components in the ores from the Northern Arkansas and the Tri-State boniferous shales and sandstones of the Ouachita Mountains [10], the various cherts from the Devonian-Lower Mississippian Arkansas Novaculite [11,12], and from the Lower Mississippian Boone Formation (the lower Boone penecontemporaneous chert and the upper Boone tripolitic and diagenetic chert) [13,14]. While the less radiogenic component has been generally attributed to various shale and sandstone units [9,10], the more radiogenic component has not yet been identified. Whole-rock Pb isotope analyses conducted for this study may help better constrain the more radiogenic component that contributed Pb to the ores.…”

“…% chlorinity in sedimentary brines has been inferred for the presence of Pb (and Zn) in sedimentary fluids at MVT ore-forming conditions [17]. [4,9]. For drawing this basemap: https://www.eia.gov/maps/maps.htm (accessed on 29 December 2020).…”

“…For drawing this basemap: https://www.eia.gov/maps/maps.htm (accessed on 29 December 2020). [4,9]. For drawing this basemap: https://www.eia.gov/maps/maps.htm (accessed on 29 December 2020).…”

Study on the Interaction between Galena and Sphalerite During Grinding Based on the Migration of Surface Components

“…Galena (PbS) and sphalerite (ZnS) are abundant in the earth and usually exist together in the same deposit. 1−3 Most lead–zinc ores are processed by differential flotation, in which galena is recovered first followed by sphalerite. 4,5 The addition/presence of lead ions (Pb 2+ ) in ore pulp can directly promote the sphalerite flotation.…”