Whole Rock Geochemical Data For Altered And Mineralized Rocks, Red Dog Zn-Pb-Ag District, Western Brooks Range, Alaska

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 mélange. 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).

[Summary provided by the USGS.]

本报告呈现了取自阿拉斯加北部布鲁克斯山脉西部红狗锌-铅-银（Zn-Pb-Ag）矿区的220件经蚀变且多矿化的岩石样品的地球化学分析数据。该数据集为Slack等人（2004a）开展的一项研究提供了基础，此项研究聚焦红狗矿床及西北10公里处的Anarraaq矿床围岩中的热液硅化作用及相关蚀变作用。该硫化物矿床赋存于密西西比纪库纳组（Moore等，1986）的Ikalukrok岩段（非正式命名）中。本次分析的主要岩石类型包括黑色页岩、灰色页岩、未矿化层状重晶石、矿化（富硫化物）层状重晶石、富硫化物硅质岩（由重晶石交代形成）、块状及半块状硫化物、脉状玉髓，以及布鲁克期（白垩纪）脉状石英。为保证地层学研究的完整性，本次报告还收录了少量未蚀变、未矿化的样品数据，包括黑色页岩、灰色页岩、纹层状富碳酸盐页岩、岩屑浊积岩、层状硅质岩、钙质放射虫岩以及构造混杂岩。关于本次采样的硫化物矿床及其地层背景的详细描述，可参见Slack等人（2004a）以及Kelley等人（2004a、b）的文献。本次地球化学分析数据以Microsoft Excel和.dbf电子表格格式提供，以方便数据计算与绘图操作。另有一份关于布鲁克斯山脉西部未蚀变古生代沉积岩的相关地球化学数据库，可参见Slack等人（2004b）的文献。[由美国地质调查局（USGS）提供本摘要]