Multispectral Imaging At The Needles Area (Kratt, Et Al., 2005)
Exploration Activity: Multispectral Imaging At The Needles Area (Kratt, Et Al., 2005)
|Exploration Activity Details|
|Location||The Needles Area|
|Exploration Technique||Multispectral Imaging|
Over 2000 km2 of 5-m resolution Hymap hyperspectral data was acquired in 2004. Subsequent image processing and data analysis has identified reflectance spectra for alunite, kaolinite/halloysite, illite, gypsum, vegetation, and carbonate. A portable spectrometer is being used for in situ validation, along with laboratory measurements and x-ray diffraction analyses of samples collected in teh field. We are in the process of producing and validating mineral maps that will be used to narrow the scope of exploration to areas where mineral and vegetation distributions suggest the possible presence of geothermal activity. So far, remotely-sensed gypsum anoalies have led to the identification of at least two previously unknown groups of warm and hot springs. These springs are thought to occur where sulfate-rich groundwater is mixing with calcium in teh soil and being precipitated as an evaporite crust.
- Chris Kratt, Wendy Calvin, Mark Coolbaugh (2005) Hyperspectral Mineral Mapping For Geothermal Exploration On The Pyramid Lake Paiute Reservation, Nevada