Clays and Clay Minerals, Vol. 55, No. 1, 1–17, 2007.
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Authors
Bishop, Janice L.
Schiffman, Peter
Murad, Enver
Dyar, M. Darby
Drief, Ahmed
Lane, Melissa D.
Issue Date
2007
Type
Article
Language
Keywords
Periodicals , Geology , Altered Tephra , Alunite , EMPA , Infrared Spectroscopy , Jarosite , Mars , Mossbauer , SEM , Smectite , Solfataric Alteration , XRD
Alternative Title
Characterization Of Alteration Products In Tephra From Haleakala, Maui: A Visible-infrared Spectroscopy, Mo¨ssbauer spectroscopy, Xrd, Empa And Tem Study
Abstract
Altered basaltic tephra from Haleakala, Maui, are characterized using multiple techniques in order to identify the minerals formed under a variety of conditions and to understand the soil formation processes here. We collected samples that are representative of typical bulk weathered material in the crater, as well as solfataric alteration in a hydrothermal environment. For this study X-ray diffraction, electron probe microanalysis, scanning electron microscopy and transmission electron microscopy are coupled with spectroscopic techniques including Mo¨ ssbauer, visible-infrared reflectance, transmission infrared, and thermal infrared emission spectroscopies to analyze these samples. The unaltered tephra are composed of feldspar, glass, pyroxene and olivine. Observed alteration products include Fe oxides, phyllosilicates and sulfates, as well as SAED amorphous Al-Si-bearing material. These samples are potential analogs for altered volcanic material on Mars as the pedogenic influences and contact with plants and animals are minimal. Results from this study may help to determine spectral signatures of these samples that could be used for identification on Mars of the minerals observed here.
Description
Clays and Clay Minerals, Vol. 55, No. 1, 1–17, 2007. Characterization Of Alteration Products In Tephra From Haleakala, Maui: A Visible-infrared Spectroscopy, Mo¨ssbauer spectroscopy, Xrd, Empa And Tem Study. Janice L. Bishop; Peter Schiffman; Enver Murad; M. Darby Dyar; Ahmed Drief; Melissa D. Lane. DOI: 10.1346/CCMN.2007.0550101. Copyright © 2007, The Clay Minerals Society.
Citation
Clays and Clay Minerals, Vol. 55, No. 1, 1–17, 2007.
Publisher
The Clay Minerals Society
License
Copyright © 2006-2018, The Clay Minerals Society