Mapping Lithologic Units on Cinder Cones at the Summit of Mauna Kea Using AVIRIS Hyperspectral Reflectance Data

Details Mapping Lithologic Units on Cinder Cones at the Summit of Mauna Kea Using AVIRIS Hyperspectral Reflectance Data Mapping Lithologic Units on Cinder Cones at the Summit of Mauna Kea Using AVIRIS Hyperspectral Reflectance Data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p71a0441g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P71A-0441

Other

5415 Erosion And Weathering, 5464 Remote Sensing, 5470 Surface Materials And Properties, 8424 Hydrothermal Systems (8135)

Scientific paper

Spectral reflectance data (0.4 to 2.4 micrometers) derived from the Airborne Visible Infrared Imaging Spectrometer (AVIRIS) instrument are used in combination with field and laboratory work to map the distribution of ferric oxide minerals and phyllosilicates exposed on cinder cones at the summit of Mauna Kea Volcano, Hawaii. Analysis of 0.4 to 1.1 micrometer data identified electronic transition features for hematite, palagonite, and jarosite. Three spectrally distinct units of hematite are identified and mapped based on the depth of the ferric absorption features. Kaolinite, montmorillonite, and saponite are also identified and mapped based on metal-OH absorptions in the wavelength region of 2.0 to 2.5 micrometers. Analysis of laboratory reflectance spectra of tephra samples collected from thirteen sites on Puu Poliahu are consistent with the AVIRIS data and thus provide validation for the derived unit map. Surfaces of relatively fresh, uneroded cinder cones are typically dominated by the concentrically zoned hematite units where hematite with the deepest ferric absorption bands occurs at the summit of the cones. Surfaces of eroded, hydrothermally altered cinder cones such as Puu Poliahu, have several localized exposures of the phyllosilicate, alunite, and jarosite units that may reflect strong alteration along fractures that focused hydrothermal fluids. Apparent alteration zones (as sensed remotely) are amplified by downslope mass wasting around mineralized outcropping zones.

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