USGS Series | Scientific Investigations Map |
---|---|
Report Number | 2777 |
Title | Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota |
Edition | Version 1.0 |
Language | ENGLISH |
Author(s) | Redden, Jack A.; DeWitt, Ed |
Year | 2008 |
Originating office | Central Mineral Resources Team |
USGS Library Call Number | |
Physical description | Report: iv, 44 p.; 2 Map Sheets - Sheet 1: 44 x 61.5 inches, Sheet 2: 43 x 57 inches; Downloads Directory |
ISBN | 9781411322141 |
Northernmost latitude | 0443000 |
Southernmost latitude | 0433000 |
Easternmost longitude | -1030000 |
Westernmost longitude | -1040000 |
For more information or ordering assistance, call 1-888-ASK-USGS (1-888-275-8747), visit http://ask.usgs.gov, contact any USGS Earth Science Information Center (ESIC), or write:
This 1:100,000-scale digital geologic map details the complex Early Proterozoic granitic rocks, Early Proterozoic supracrustal metamorphic rocks, and Archean crystalline basement of the Black Hills. The granitic rocks host pegmatite deposits renowned for their feldspar, mica, spodumene, and beryl. The supracrustal rocks host the Homestake gold mine, which produced more than 40 million ounces of gold over a 125-year lifetime. The map documents the Laramide deformation of Paleozoic and Mesozoic cover rocks; and shows the distribution of Laramide plutonic rocks associated with precious-metals deposits. Four 1:300,000-scale maps summarize Laramide structures; Early Proterozoic structures; aeromagnetic anomalies; and gravity anomalies. Three 1:500,000-scale maps show geophysical interpretations of buried Early Proterozoic to Archean rocks in western South Dakota and eastern Wyoming.