Preliminary evaluation of the landsat-4 thematic mapper data for mineral exploration
Advances in Space Research
By: M. H. Podwysocki, M.S. Power, and O. D. Jones
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Abstract
Landsat-4 Thematic Mapper (TM) data recorded over an arid terrain were analyzed to determine the applicability of using of TM data for identifying and mapping hydrothermally altered, potentially mineralized rocks. Clays, micas, and other minerals bearing the OH anion in specific crystal lattice positions have absorption bands in the 2.2-??m region (TM channel 7, TM7) and commonly lack features in the 1.6-??m region (TM5). Channel ratios TM5/TM7, TM5/TM4, and TM3/TM1 were combined into a color-ratio-composite (CRC) image and used to distinguish hydrothermally altered rocks, unaltered rocks, and vegetation. These distinctions are made possible by using the TM5 and TM7, channels which are not available in the Landsat multispectral scanner (MSS). Digital masking was used to eliminate ambiguities due to water and shadows. However, some ambiguities in identification resulted between altered volcanic rocks and unaltered sedimentary deposits that contained clays, carbonates, and gypsum, and between altered volcanic rocks and volcanic tuffs diagenetically altered to zeolites. However, compared to MSS data, TM data should greatly improve the ability to map hydrothermally altered rocks in arid terrains. ?? 1985.
Suggested Citation
Podwysocki, M.H., Power, M., and Jones, O.D., 1985, Preliminary evaluation of the landsat-4 thematic mapper data for mineral exploration: Advances in Space Research, v. 5, no. 5, p. 13-20, https://doi.org/10.1016/0273-1177(85)90252-2.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Preliminary evaluation of the landsat-4 thematic mapper data for mineral exploration |
| Series title | Advances in Space Research |
| DOI | 10.1016/0273-1177(85)90252-2 |
| Volume | 5 |
| Issue | 5 |
| Year Published | 1985 |
| Language | English |
| Publisher | Elsevier |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Advances in Space Research |
| First page | 13 |
| Last page | 20 |