Mapping of hydrothermal alteration in the Cuprite mining district, Nevada, using aircraft scanner images for the spectral region 0.46 to 2.36µm

Research Article| December 01, 1977 Mapping of hydrothermal alteration in the Cuprite mining district, Nevada, using aircraft scanner images for the spectral region 0.46 to 2.36µm Michael J. Abrams; Michael J. Abrams 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103 Search for other works by this author on: GSW Google Scholar Roger P. Ashley; Roger P. Ashley 2U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Lawrence C. Rowan; Lawrence C. Rowan 3U.S. Geological Survey, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar Alexander F. H. Goetz; Alexander F. H. Goetz 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103 Search for other works by this author on: GSW Google Scholar Anne B. Kahle Anne B. Kahle 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103 Search for other works by this author on: GSW Google Scholar Geology (1977) 5 (12): 713–718. https://doi.org/10.1130/0091-7613(1977)52.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Michael J. Abrams, Roger P. Ashley, Lawrence C. Rowan, Alexander F. H. Goetz, Anne B. Kahle; Mapping of hydrothermal alteration in the Cuprite mining district, Nevada, using aircraft scanner images for the spectral region 0.46 to 2.36µm. Geology 1977;; 5 (12): 713–718. doi: https://doi.org/10.1130/0091-7613(1977)52.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Color composites of Landsat Multispectral Scanner ratio images that display variations in the intensity of ferric-iron absorption bands are highly effective for mapping limonitic altered rocks but are ineffective for mapping nonlimonitic altered rocks. Analysis of 0.45- to 2.5-µm field and laboratory spectra shows that iron-deficient opalized rocks in the Cuprite mining district, Nevada, have an intense OH-absorption band near 2.2 µm, owing to their content of clay minerals and alunite, and that this spectral feature is absent or weak in adjacent unaltered tuff and basalt. Altered rocks in the district can be discriminated from unaltered rocks with few ambiguities by use of color-ratio composite images derived from multispectral (0.46 to 2.36 µm) aircraft data. In addition, some effects of mineralogical zoning can be discriminated within the altered area. Only variations in amounts of limonite can be discerned in shorter wavelength aircraft data, Landsat Multispectral Scanner bands, and color aerial photographs. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.