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  • 1
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    Unknown
    In:  CASI
    Publication Date: 2019-06-27
    Description: Ten potential target areas for metallic mineral exploration were selected on the basis of a photo-lineament interpretation of the ERTS image 1172-17141 in central Colorado. An evaluation of bias indicated that prior geologic knowledge of the region had little, if any, effect on target selection. In addition, a contoured plot of the frequency of photo-lineament intersections was made to determine what relationships exist between the photo-lineaments and mineral districts. Comparison of this plot with a plot of the mineral districts indicates that areas with a high frequency of intersections commonly coincide with known mineral districts. The results of this experiment suggest that photo-lineaments are fractures or fracture-controlled features, and their distribution may be a guide to metallic mineral deposits in Colorado, and probably other areas as well.
    Keywords: GEOPHYSICS
    Type: PAPER-G14 , NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. A; p 785-796
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Topography was found to be the most important factor defining folds on ERTS-1 imagery of northwestern Colorado; tonal variations caused by rock reflectance and vegetation type and density are the next most important factors. Photo-linears mapped on ERTS-1 imagery of central Colorado correlate well with ground-measured joint and fracture trends. In addition, photo-linears have been successfully used to determine the location and distribution of metallic mineral deposits in the Colorado Mineral Belt. True color composites are best for general geologic analysis and false color composites prepared with positive/negative masks are useful for enhancing local geologic phenomena. During geologic analysis of any given area, ERTS-1 imagery from several different dates should be studied.
    Keywords: GEOPHYSICS
    Type: E74-10330 , NASA-CR-136825 , REPT-73-5 , PR-9
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-10041 , NASA-CR-130320
    Format: application/pdf
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  • 4
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-11047 , NASA-CR-133931
    Format: application/pdf
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