NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Hydrothermal Alteration on Basaltic Mauna Kea Volcano as a Template for Identification of Hydrothermal Alteration on Basaltic MarsCertain samples of palagonitic tephra from Mauna Kea Volcano (Hawaii) are spectral analogues for bright martian surface materials at visible and near-IR wavelengths because both are characterized by a ferric absorption edge extending from about 400 to 750 nm and relatively constant reflectivity extending from about 750 nm to beyond 2000 nm. Palagonite is a yellow or orange isotropic mineraloid formed by hydration and devitrification of basaltic glass. For Mars-analogue palagonite, the pigment is nanometersized ferric oxide particles (np-Ox) dispersed throughout an allophane-like hydrated basaltic glass matrix. Crystalline phyllosilicates are not generally detected, and the hydration state of the is not known. The poorly crystalline nature of glass alteration products implies relatively low temperature formation pathways. We report here x-ray diffraction, major element, Mossbauer, and VNIR data for 9 basaltic tephras. Thermal emission spectra are reported in a separate abstract. Our multidisciplinary approach both tightly constrains mineralogical interpretations and maximizes overlap with datasets available for the martian surface available now and in the future.
Document ID
20030111516
Document Type
Conference Paper
Authors
Morris, R. V. (NASA Johnson Space Center Houston, TX, United States)
Graff, T. G. (Arizona State Univ. Tempe, AZ, United States)
Ming, D. W. (Arizona State Univ. Tempe, AZ, United States)
Mertzman, S. A. (Franklin and Marshall Coll. Lancaster, PA, United States)
Bell, J. F., III (Cornell Univ. Ithaca, NY, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar and Planetary Science and Exploration
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

IDRelationTitle20030110578Analytic PrimaryLunar and Planetary Science XXXIV
Document Inquiry