Thermal infrared exploration in the Carlin trend, northern Nevada
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Abstract
Experimental Thermal Infrared Multispectral Scanner (TIMS) aircraft data have been acquired for the Rodeo Creek NE 7 1/2 minute quadrangle, Eureka County, northern Nevada, covering the Carlin gold mine. A simple model has been developed to extract spectral emissivities for mapping surface lithology and alteration based on the physical properties of geologic materials. Emissivity-ratio images were prepared that allow generalized lithologic discrimination, identification of areas with high silica content, and the first reported detection of the carbonate secondary reststrahlen feature. Together with thermal-inertia images, they permit identification of areas of subtle lithologic variation not shown on conventional geologic maps. Emissivity-ratio spectra extracted from the data compare favorably with modeled laboratory spectra and establish for the first time the link among theory, measured physical properties, and color-composited TIMS images. Identification of previously unknown silicification in the Tertiary volcanic rocks and mapping of a silicified structure and possible extensions in alluvium indicate that TIMS data can be a valuable tool for detecting subtle alteration associated with mineralization, particularly in less accessible or less well-known areas.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Thermal infrared exploration in the Carlin trend, northern Nevada |
| Series title | Geophysics |
| DOI | 10.1190/1.1442773 |
| Volume | 55 |
| Issue | 1 |
| Year Published | 1990 |
| Language | English |
| Publisher | Society of Exploration Geophysicists |
| Description | 10 p. |
| First page | 70 |
| Last page | 79 |
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