Whole rock geochemical data For altered and mineralized rocks, Red Dog Zn-Pb-Ag District, western Brooks Range, Alaska

Abstract

This report presents geochemical analyses for 220 mostly altered and mineralized rock samples from the Red Dog Zn-Pb-Ag district in the western Brooks Range of northern Alaska. These data form the basis for a study by Slack et al. (2004a) on hydrothermal silicification and related alteration in wall rocks of the Red Dog deposits and the Anarraaq deposit 10 km to the northwest. The sulfide deposits occur within the Ikalukrok unit (informal name) of the Mississippian Kuna Formation (Moore and others, 1986). Principal rock types that were analyzed include black and gray shale, unmineralized bedded barite, mineralized (sulfide-rich) bedded barite, sulfide-rich silica rock (replaced barite), massive and semimassive sulfide, vein chalcedony, and Brookian (Cretaceous) vein quartz. For stratigraphic completeness, data are also reported here for a limited number of unaltered and unmineralized samples of black and gray shale, laminated carbonate-rich shale, lithic turbidite, bedded siliceous rock, calcareous radiolarite, and tectonic melange. Detailed descriptions of the sampled sulfide deposits and their stratigraphic settings are given in Slack and others (2004a) and Kelley and others (2004a, b). The geochemical analyses are presented here in Microsoft Excel and .dbf spreadsheet formats in order to facilitate calculations and plotting of data. A related geochemical database on unaltered Paleozoic sedimentary rocks of the western Brooks Range is available in Slack and others (2004b).