Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p71a0453p&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P71A-0453
Mathematics
Logic
5464 Remote Sensing, 5470 Surface Materials And Properties, 5494 Instruments And Techniques, 6215 Extraterrestrial Materials
Scientific paper
Laboratory characterisation of terrestrial analogues of planetary materials is a fundamental step for a correct analysis of remote sensing data returned by space instrumentation or ground-based observations. Among the most common minerals in our Solar System, the plagioclase feldspars, that we know are present on the surface of Mars, of the Moon and probably of the most of the solid planetary bodies. In this work we show morphological, chemical and infrared spectroscopic analysis of a large suite of plagioclases having different end-member composition (the albite-anorthite series). For each of the four powdered samples, with size ranges <20, 20-50, 50-100, 100-200 microns, we give the dimensional analysis and the spectral behaviour in the 6000-400 cm-1 spectral interval at a resolution of 2 cm-1. In the analysis of the diffuse reflectance spectra we found a clear shift of the main stretching vibration bands towards the lower wavenumbers with the increasing of anorthite content, in agreement with previous studies. This effect is evident for the Christiansen feature (Cf) too. Since the Cf is usually more diagnostic in retrieving mineral composition from infrared data, especially for finer dusty samples, we tried to find a clear relation between the anorthite content of the plagioclase material and the location of the Cf. Moreover, by applying the Lorentz oscillator model to the specular reflectance data, we were able to retrieve the optical constants. The set of spectroscopic results forms a reference frame useful to obtain quantitative information from planetary observations once used in appropriate radiation transfer models.
Colangeli Luigi
Esposito Floriana
Palomba Ernesto
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