| Preliminary Report on Using Imaging Spectroscopy to Map Ultramafic        Rocks, Serpentinites, and Tremolite-Actinolite-Bearing Rocks in California |  |
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| By Gregg A. Swayze1, Chris T. Higgins2, John P. Clinkenbeard2, Raymond F. Kokaly1, Roger N. Clark1, Gregory P. Meeker1, and Stephen J. Sutley1 |
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| **1**U.S. Geological Survey, MS964 Box 25046, Denver Federal              Center, Denver, Colo. 80225**2**California Department of Conservation, California Geological Survey, 801 K Street, MS 13-40, Sacramento, Calif. 95814 |
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| **Open-File Report 2004–1304** |
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| **Version 1.0** |
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| 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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| - OF 2004–1304 PDF file (24.4            MB)   ****Large File Warning**** | **Full Report, including figures.***(This version of the report is accessible as defined in    Section 508.)* |
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| Text-Only PDF file                      (280 KB) | **Text-Only version of the report.** |
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| - Figure 1 PDF file (677 KB) | **Location of AVIRIS low-altitude flight lines** |
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| - Figure 2A PDF file (1.70 MB) | **Flagstaff Hill mineral map** |
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| - Figure 2B PDF file (1.89 MB) | **Details of Iron Mountain area** |
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| - Figure 3 PDF file (2.33 MB) | **Garden Valley mineral map** |
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| - Figure 4A PDF file (1.31 MB) | **Little Bald Mountain mineral map** |
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| - Figure 4B PDF file (2.88 MB) | **Details of Bear Creek Quarry area** |
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| - Figure 5A PDF file (1.83 MB) | **Red Hill mineral map** |
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| - Figure 5B PDF file (3.42 MB) | **Details of Red Hill mineral map** |
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| - Figure 6 PDF file (167 KB) | **Reflectance spectra of vibrational absorptions of some minerals** |
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| - Figure 7A PDF file (2.93 MB) | **Scanning electron micrograph of chrysotile fibers in a hand sample** |
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| - Figure 7B PDF file (2.36 MB) | **Scanning elecron micrograph of chrysotile fibers on non-fibrous grain** |
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| U.S. Department of the Interior | U.S. Geological Survey      URL: https://pubsdata.usgs.gov/pubs/of/2004/1304/Questions or Assistance: USGS Web ContactPage Last Modified: Sat Jan 12 23:32 EDT 2013 |  |

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