Hydrothermal Alteration Maps of the Central and Southern Basin and Range Province of the United States Compiled From Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data

Advanced Spaceborne Thermal Emission and Reflection Radiometer
(ASTER) data and Interactive Data Language (IDL) logical operator
algorithms were used to map hydrothermally altered rocks in the
central and southern parts of the Basin and Range province of the
United States. The hydrothermally altered rocks mapped in this
study include (1) hydrothermal silica-rich rocks (hydrous quartz,
chalcedony, opal, and amorphous silica), (2) propylitic rocks
(calcite-dolomite and epidote-chlorite mapped as separate mineral
groups), (3) argillic rocks (alunite-pyrophyllite-kaolinite), and
(4) phyllic rocks (sericite-muscovite). A series of hydrothermal
alteration maps, which identify the potential locations of
hydrothermal silica-rich, propylitic, argillic, and phyllic rocks on
Landsat Thematic Mapper (TM) band 7 orthorectified images, and
shape files of hydrothermal alteration units are provided.