Effects of the chemical environment on the spectroscopic properties of clays: Applications for Mars

Details Effects of the chemical environment on the spectroscopic properties of clays: Applications for Mars Effects of the chemical environment on the spectroscopic properties of clays: Applications for Mars

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993chwe.work....4b&link_type=abstract

In Lunar and Planetary Inst., MSATT Workshop on Chemical Weathering on Mars p 4-6 (SEE N93-31933 12-91)

Biology

Absorption Spectra, Chemical Composition, Clays, Mars Environment, Mars Surface, Planetary Evolution, Planetary Geology, Soils, Weathering, Cations, Gamma Rays, Iron, Montmorillonite, Mossbauer Effect, Near Infrared Radiation, Reflectance, Spectroscopy, Viking Mars Program, Water

Scientific paper

Laboratory studies of Mars soil analogs pose unique problems, since soils interact readily with their environment and exhibit variable characteristics depending on the environment. We have performed a series of experiments focusing on the spectral properties of clays and how they vary as a function of composition and environment, including examination of fundamental as well as overtone absorptions, that occur in the mid- and near-IR, respectively. Smectite clays have been selected in our laboratory experiments as a primary surface analog for Mars because of their compatibility with results of the Viking biology experiments, their stability under current martian conditions, and their compatibility with reflectance spectra of Mars. We prepared a number of monoionic montmorillonites in order to examine the influence of cations on the water molecules in the clay interlayer region. Moessbauer spectra of several montmorillonites with variable amounts of interlayer iron confirm the presence of ferrihydrite.

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