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Distribution of Potential Hydrothermally Altered Rocks in Central Colorado Derived From Landsat Thematic Mapper Data: A Geographic Information System Data Set

机译:科罗拉多州中部潜在水热蚀变岩石的分布源自Landsat专题制图数据:地理信息系统数据集

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As part of the Central Colorado Mineral Resource Assessment Project, the digital image data for four Landsat Thematic Mapper scenes covering central Colorado between Wyoming and New Mexico were acquired and band ratios were calculated after masking pixels dominated by vegetation, snow, and terrain shadows. Ratio values were visually enhanced by contrast stretching, revealing only those areas with strong responses (high ratio values). A color-ratio composite mosaic was prepared for the four scenes so that the distribution of potentially hydrothermally altered rocks could be visually evaluated. To provide a more useful input to a Geographic Information System-based mineral resource assessment, the information contained in the color-ratio composite raster image mosaic was converted to vector-based polygons after thresholding to isolate the strongest ratio responses and spatial filtering to reduce vector complexity and isolate the largest occurrences of potentially hydrothermally altered rocks. From 2004 to 2008, the United States Geological Survey (USGS) Central Colorado Assessment Project (CCAP) was charged with conducting a mineral resource assessment of Federal lands, primarily U.S. National Forest land, in central Colorado (fig. 1). As part of the mineral resource assessment, Landsat Thematic Mapper (TM) imagery data were used to help target areas where the exposed rocks might be hydrothermally altered, providing an indication of the location of potentially mineralized areas that may contain mineral deposits.

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