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Regional hydrothermal alteration maps compiled from remote sensing data (phyllic, argillic, propylitic, and silicic types) and regional geochemical datasets for the southwestern United States are now available in GIS format. Rock alteration and regional geochemical mapping have traditionally been used with geologic maps to define mineral exploration targets and as a guide to resource assessment, but these and other regional geophysical data, such as gravity and geomagnetics, have often not been thoroughly evaluated or integrated into mineral resource studies.
We will use geospatial and statistical techniques to integrate remote-sensing, geochemical, and other regional geophysical data into new quantitative methods to map mineral resource prospectivity. The new quantitative methods will provide a basis for investigating problems such as
The available geologic framework, remote-sensing coverage, regional geochemistry, and mineral deposit and prospect data for porphyry copper and epithermal-related mineralization in the southwestern U.S. will provide a well constrained study area to develop and test the new quantitative techniques. Digital datasets and geospatial-geostatistical algorithms that make up the new geospatial-statistical quantitative methods will be synthesized and compiled in a geographic information system that will allow for more efficient access and analysis of the data and assessment results. Thus, the new quantitative methods will enhance mineral assessments, regional mineralogical and tectonic studies, and exploration by effectively combining and using state-of-the-art remote sensing, geophysical and geochemical digital datasets to quantitatively identify and define potential deposit sites and map mineral resource prospectivity.
Our main tasks are listed below.
Berger, B.R., Mars, J.C., Denning, P.D., Phillips, J.D., Hammarstrom, J.M., Zientek, M.L, Dicken, C.L., and Drew, L.J., with contributions from Alexeiev, D., Seltmann, R., and Herrington, R.J., 2014, Porphyry copper assessment of western Central Asia: U.S. Geological Survey Scientific Investigations Report 2010–5090–N, 219 p., 8 plates, and spatial data, https://doi.org/10.3133/sir20105090N.
Mars, J.C., 2014, Regional mapping of hydrothermally altered igneous rocks along the Urumieh-Dokhtar, Chagai, and Alborz Belts of western Asia using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data and Interactive Data Language (IDL) logical operators—A tool for porphyry copper exploration and assessment: U.S. Geological Survey Scientific Investigations Report 2010–5090–O, 36 p., 10 plates, and spatial data, https://doi.org/10.3133/sir20105090O.
Mars, J.C., 2013, 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 (ver. 1.1, April 8, 2014): U.S. Geological Survey Open-File Report 2013–1139, 5 p., 13 plates, scale 1:1,300,000, https://doi.org/10.3133/ofr20131139.
Hammarstrom, J.M., Mars, J.C., Robinson Jr., G.R., Ludington, S., Zurcher, L., Folger, H., Gettings, M., Solano, F., and Kress, T., 2015, Copper in the Southern Basin and Range of the United States—Is anything left?: Geological Society of America Abstracts with Programs, Vol. 47, No. 7, p. 519. View Hammarstrom 2015 GSA abstract.
Mars, J., Hammarstrom, J., Robinson, G., Ludington, S., Zurcher, L., Folger, H., Gettings, M., Solano, F., and Kress, T., 2017, New Method to Integrate Remotely Sensed Hydrothermal Alteration Mapping into Quantitative Mineral Resource Assessments: 2017 International Geoscience and Remote Sensing Symposium (IGARSS), 23-28 July 2017, Fort Worth, TX.
Mars, J.C., Robinson Jr., G.R., Hammarstrom, J.M., Ludington, S., Zurcher, L., Folger, H., Gettings, M.E., Solano, F., and Kress, T., 2015, Integration of remote-sensing alteration mapping into new geospatial-statistical, quantitative mineral resource methods: Geological Society of America Abstracts with Programs, Vol. 47, No. 7, p. 74. View Mars 2015 GSA abstract.
John C. Mars
Eastern Mineral and Environmental Resources Science Center