This map was developed by the U.S. Geological Survey Mineral Resources Program to depict the fundamental geologic features for the western part of the Fortymile mining district of east-central Alaska, and to delineate the location of known bedrock mineral prospects and their relationship to rock types and structural features.
This geospatial map database presents a 1:63,360-scale geologic map for the Kechumstuk fault zone and surrounding area, which lies 55 km northwest of Chicken, Alaska. The Kechumstuk fault zone is a northeast-trending zone of faults that transects the crystalline basement rocks of the Yukon-Tanana Upland of the western part of the Fortymile mining district. The crystalline basement rocks include Paleozoic metasedimentary and metaigneous rocks as well as granitoid intrusions of Triassic, Jurassic, and Cretaceous age. The geologic units represented by polygons in this dataset are based on new geologic mapping and geochronological data coupled with an interpretation of regional and new geophysical data collected by the Alaska Department of Natural Resources, Division of Geological and Geophysical Surveys. The geochronological data are reported in the accompanying geologic map text and represent new U-Pb dates on zircons collected from the igneous and metaigneous units within the map area.
|Publication Subtype||USGS Numbered Series|
|Title||Geologic map of the Kechumstuk fault zone in the Mount Veta area, Fortymile mining district, east-central Alaska|
|Series title||Scientific Investigations Map|
|Edition||Version 1.1: March 12, 2014; Version 1.0: March 10, 201|
|Publisher||U.S. Geological Survey|
|Publisher location||Reston, VA|
|Contributing office(s)||Central Mineral and Environmental Resources Science Center|
|Description||1 Plate: 45.00 x 36.00 inches; HTML Document|
|Other Geospatial||Fortymile Mining District|
|Datum||1927 North American Datum|
|Projection||Universal Transverse Mercator projection|
|Online Only (Y/N)||Y|
|Additional Online Files (Y/N)||Y|
|Google Analytics Metrics||Metrics page|