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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 |
| Open-File Report 2004–1304 |
| Version 1.0 |
| Published 2004 |
| 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 the mineral maps. |
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Full Report, including figures. (This version of the report is accessible as defined in Section 508.) |
| Text-Only version of the report. |
| Location of AVIRIS low-altitude flight lines |
| Flagstaff Hill mineral map |
| Details of Iron Mountain area |
| Garden Valley mineral map |
| Little Bald Mountain mineral map |
| Details of Bear Creek Quarry area |
| Red Hill mineral map |
| Details of Red Hill mineral map |
| Reflectance spectra of vibrational absorptions of some minerals |
| Scanning electron micrograph of chrysotile fibers in a hand sample |
| Scanning elecron micrograph of chrysotile fibers on non-fibrous grain |
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