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Open-File Report 2013–1090

Geologic Map of the East Half of the Lime Hills 1:250,000-Scale Quadrangle, Alaska

By Bruce M. Gamble, Bruce L. Reed, Donald H. Richter, and Marvin A. Lanphere

Thumbnail of and link to report PDF (25.5 MB)Introduction

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.

First posted May 31, 2013

         Files for viewing and printing:

  • Map PDF (25.5 MB).

For additional information contact:
Alaska Science Center staff
U.S. Geological Survey
4210 University Dr.
Anchorage, AK 99508
Alaska Mineral Resources
Alaska Science Center

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Suggested citation:

Gamble, B.M, Reed, B.L., Richter, D.H, and Lanphere, M.A, 2013, Geologic map of the east half of the Lime Hills 1:250,000-scale quadrangle, Alaska: U.S. Geological Survey Open-File Report 2013–1090, scale 1:250,000 and GIS data, http://pubs.usgs.gov/of/2013/1090/.


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