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-μm region (TM channel 7, TM7) and commonly lack features in the 1.6-μm 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.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Preliminary evaluation of the landsat-4 thematic mapper data for mineral exploration


    Beteiligte:
    Podwysocki, M.H. (Autor:in) / Power, M.S. (Autor:in) / Jones, O.D. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.1985


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Landsat thematic mapper attitude data processing

    SEHN, G. / MILLER, S. | AIAA | 1984


    Discrimination of rock types using Landsat Thematic Mapper data

    Patel, Nilanchal / Rampal, K.K. | Elsevier | 1992


    Preliminary Evaluation of Thematic Mapper Image Data Quality

    Macdonald, R. B. / Hall, F. G. / Pitts, D. E. et al. | NTRS | 1985


    Landsat-D Thematic Mapper Technical Working Group Meeting

    Hovis, W. / Nichols, J. / Potter, A. et al. | NTRS | 1975