Geochemical results, sample localities, and descriptions of some rocks from the Proterozoic Kilbuck terrane, Goodnews Quadrangle, southwestern Alaska

Geologic studies in Alaska by the U.S. Geological Survey, 1990

“…"Red spots" are described as oxidized pyrite-bearing rhyolite dikes and sulfide-rich quartz veins that occur as dike/ vein networks hosted in volcanic, volcaniclastic, and sedimentary rocks of the Togiak and Tikchik terranes in the southeastern part of the Bethel quadrangle. Felsic dikes were not normally observed in our study of specific areas in the eastern Goodnews Bay quadrangle, but the dike/vein systems described by Frost (1990) bear a collective trace-element signature (Ag, As, Au, Cu, Hg, Mo, Pb, Sb, and W) that is nearly identical to those of the rock and sediment anomalies found in the eastern half of the Goodnews Bay quadrangle. Additional studies are required to determine the extent and significance of the mineralization.…”

“…Although mineralized veins are generally small and discontinuous, they are the basis for significant rock anomalies and probably account for many of the regional stream-sediment geochemical anomalies. Altered and oxide-stained sedimentary rocks and associated granitic stocks examined in this study were first noted in the region by Mertie (1938) and are geochemically similar to the "red spots" discussed by Frost (1990) in the Bethel quadrangle to the north. "Red spots" are described as oxidized pyrite-bearing rhyolite dikes and sulfide-rich quartz veins that occur as dike/ vein networks hosted in volcanic, volcaniclastic, and sedimentary rocks of the Togiak and Tikchik terranes in the southeastern part of the Bethel quadrangle.…”