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Geologic map of the east half of the Lime Hills 1:250,000-scale quadrangle, Alaska

Open-File Report 2013-1090

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Abstract

This map is compiled from geologic mapping conducted between 1985 and 1992 by the U.S. Geological Survey as part of the Alaska Mineral Resource Assessment Program. That mapping built upon previous USGS work (1963–1988) unraveling the magmatic history of the Alaska–Aleutian Range batholith. Quaternary unit contacts depicted on this map are derived largely from aerial-photograph interpretation. K-Ar ages made prior to this study have been recalculated using 1977 decay constants. The east half of the Lime Hills 1:250,000-scale quadrangle includes part of the Alaska–Aleutian Range batholith and several sequences of sedimentary rocks or mixed sedimentary and volcanic rocks. The Alaska–Aleutian Range batholith contains rocks that represent three major igneous episodes, (1) Early and Middle Jurassic, (2) Late Cretaceous and early Tertiary, and (3) middle Tertiary; only rocks from the latter two episodes are found in this map area. The map area is one of very steep and rugged terrain; elevations range from a little under 1,000 ft (305 m) to 9,828 ft (2,996 m). Foot traverses are generally restricted to lowermost elevations. Areas suitable for helicopter landings can be scarce at higher elevations. Most of the area was mapped from the air, supplemented by direct examination of rocks where possible. This restricted access greatly complicates understanding some of the more complex geologic units. For example, we know there are plutons whose compositions vary from gabbro to granodiorite, but we have little insight as to how these phases are distributed and what their relations might be to each other. It is also possible that some of what we have described as compositionally complex plutons might actually be several distinct intrusions.

Study Area

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geologic map of the east half of the Lime Hills 1:250,000-scale quadrangle, Alaska
Series title:
Open-File Report
Series number:
2013-1090
Year Published:
2013
Language:
English
Publisher:
U.S. Geological Service
Publisher location:
Reston, VA
Contributing office(s):
Alaska Science Center
Description:
Map: 35 inches x 28 inches; Readme: PDF file; Metadata folder; GIS Data: ZIP file
Country:
United States
State:
Alaska
Other Geospatial:
Lime Hills
Datum:
North American Datum of 1927
Projection:
Universal Transverse Mercator, Zone 5N
Scale:
250000
Online Only (Y/N):
Y
Additional Online Files(Y/N):
Y