Preliminary Report on Using Imaging Spectroscopy to Map Ultramafic
Rocks, Serpentinites, and Tremolite-Actinolite-Bearing Rocks in California
By Gregg A. Swayze1, Chris T. Higgins2, John P. Clinkenbeard2, Raymond F. Kokaly1, Roger N. Clark1, Gregory P. Meeker1, and Stephen J. Sutley1
1U.S. Geological Survey, MS964 Box 25046, Denver Federal
Center, Denver, Colo. 80225
2California Department of Conservation, California Geological Survey, 801 K Street, MS 13-40, Sacramento, Calif. 95814
| Open-File Report 2004–1304
|Airborne Visible/InfraRed Imaging Spectrometer (AVIRIS) data were collected
in approximately 3-kilometer-wide swaths over selected areas in El Dorado
and Plumas Counties that contain serpentinite and ultramafic rocks as part
of an experiment to determine if potentially asbestos-bearing rocks could
be identified spectrally. Mineral maps created from the AVIRIS data were
used successfully to delineate exposures of serpentine and tremolite-actinolite/talc
in areas with up to 70 percent vegetation cover in some cases. In other
cases, the density of vegetation is so high that it prevented spectral
identification by AVIRIS of minerals in those areas, thus there may be
more serpentine and tremolite-actinolite/talc present than is shown on
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