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Scientific Investigations Map 3291

Geologic Map of the Kechumstuk Fault Zone in the Mount Veta Area, Fortymile Mining District, East-Central Alaska

By Warren C. Day, J. Michael O’Neill, Cynthia Dusel-Bacon, John N. Aleinikoff, and Christopher R. Siron

Thumbnail of and link to report PDF (35.5 MB)Abstract

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.

First posted March 10, 2014

Revised March 12, 2014

For additional information, contact:
Director, Central Mineral and Environmental Resources Science Center
U.S. Geological Survey
Box 25046, MS 973
Denver, CO 80225

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Suggested citation:

Day, W.C., O’Neill, J.M., Dusel-Bacon, Cynthia, Aleinikoff, J.N., Siron, C.R., 2014, Geologic map of the Kechumstuk fault zone in the Mount Veta area, Fortymile mining district, east-central Alaska (ver. 1.1, March 12, 2014): U.S. Geological Survey Scientific Investigations Map 3291, scale 1:63,360,

ISSN 2329-132X (online)

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