Determining mineralogical variations of aeolian deposits using thermal infrared emissivity and linear deconvolution methods

Aeolian Research
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Abstract

We apply linear deconvolution methods to derive mineral and glass proportions for eight field sample training sites at seven dune fields: (1) Algodones, California; (2) Big Dune, Nevada; (3) Bruneau, Idaho; (4) Great Kobuk Sand Dunes, Alaska; (5) Great Sand Dunes National Park and Preserve, Colorado; (6) Sunset Crater, Arizona; and (7) White Sands National Monument, New Mexico. These dune fields were chosen because they represent a wide range of mineral grain mixtures and allow us to gauge a better understanding of both compositional and sorting effects within terrestrial and extraterrestrial dune systems. We also use actual ASTER TIR emissivity imagery to map the spatial distribution of these minerals throughout the seven dune fields and evaluate the effects of degraded spectral resolution on the accuracy of mineral abundances retrieved. Our results show that hyperspectral data convolutions of our laboratory emissivity spectra outperformed multispectral data convolutions of the same data with respect to the mineral, glass and lithic abundances derived. Both the number and wavelength position of spectral bands greatly impacts the accuracy of linear deconvolution retrieval of feldspar proportions (e.g. K-feldspar vs. plagioclase) especially, as well as the detection of certain mafic and carbonate minerals. In particular, ASTER mapping results show that several of the dune sites display patterns such that less dense minerals typically have higher abundances near the center of the active and most evolved dunes in the field, while more dense minerals and glasses appear to be more abundant along the margins of the active dune fields.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Determining mineralogical variations of aeolian deposits using thermal infrared emissivity and linear deconvolution methods
Series title Aeolian Research
DOI 10.1016/j.aeolia.2017.12.001
Volume 30
Year Published 2018
Language English
Publisher Elsevier
Contributing office(s) Eastern Mineral and Environmental Resources Science Center
Description 43 p.
First page 54
Last page 96
Country United States
State Alaska, Arizona, California, Colorado, Idaho, Nevada, New Mexico
Other Geospatial Algodones, Big Dune, Bruneau, Great Kobuk Sand Dunes, Great Sand Dunes National Park and Preserve, Sunset Crater, White Sands National Monument