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A collection of maps identifying hydrothermally altered rocks in the central and southern Basin and Range province of the United States. The maps were compiled using ASTER satellite data and IDL logical operator algorithms by the CEOS_EXTRA organization. They delineate four alteration types: hydrothermal silica-rich, propylitic, argillic, and phyllic rocks.
Data includes shapefiles for alteration units, requiring GIS software for full analysis. The base maps are provided as Landsat Thematic Mapper band 7 orthorectified images.