| Автор | Felzer, Benjamin |
| Автор | Hauff, Phoebe |
| Автор | Goetz, Alexander F. H. |
| Дата выпуска | 1994 |
| dc.description | Buddingtonite, an ammonium‐bearing feldspar diagnostic of volcanic‐hosted alteration, can be identified and, in some cases, quantitatively measured using short‐wave infrared (SWIR) reflectance spectroscopy. In this study over 200 samples from Cuprite, Nevada, were evaluated by X ray diffraction, chemical analysis, scanning electron microscopy, and SWIR reflectance spectroscopy with the objective of developing a quantitative remote‐sensing technique for rapid determination of the amount of ammonium or buddingtonite present, and its distribution across the site. Based upon the Hapke theory of radiative transfer from particulate surfaces, spectra from quantitative, physical mixtures were compared with computed mixture spectra. We hypothesized that the concentration of ammonium in each sample is related to the size and shape of the ammonium absorption bands and tested this hypothesis for samples of relatively pure buddingtonite. We found that the band depth of the 2.12‐μm NH<sub>4</sub> feature is linearly related to the NH<sub>4</sub> concentration for the Cuprite buddingtonite, and that the relationship is approximately exponential for a larger range of NH<sub>4</sub> concentrations. Associated minerals such as smectite and jarosite suppress the depth of the 2.12‐μm NH<sub>4</sub> absorption band. Quantitative reflectance spectroscopy is possible when the effects of these associated minerals are also considered. |
| Формат | application.pdf |
| Копирайт | Copyright 1994 by the American Geophysical Union. |
| Тема | ELECTROMAGNETICS |
| Тема | Scattering and diffraction |
| Тема | MINERAL PHYSICS |
| Тема | Optical, infrared, and Raman spectroscopy |
| Тема | Mineral Physics: X ray, neutron, and electron spectroscopy and diffraction |
| Тема | RADIO SCIENCE |
| Тема | Remote sensing |
| Название | Quantitative reflectance spectroscopy of buddingtonite from the Cuprite mining district, Nevada |
| Тип | article |
| DOI | 10.1029/93JB02975 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Solid Earth |
| Том | 99 |
| Первая страница | 2887 |
| Последняя страница | 2895 |
| Выпуск | B2 |
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