Temperature dependence of Fe/++/ crystal field spectra - Implications to mineralogical mapping of planetary surfacesResults are reported of Fe(++) crystal field spectral measurements for olivines and pyroxenes up to 400 C. The results are correlated with crystal structure data at elevated temperatures, and the validity of remote-sensed identifications of minerals on hot surfaces of the moon and Mercury is assessed. Two techniques were used to obtain spectra of minerals at elevated temperatures using a spectrophotometer. One employed a diamond cell assembly or a specially designed sample holder to measure polarized absorption spectra of heated single crystals. For the other technique, a sample holder was designed to attach to a diffuse reflectance accessory to produce reflectance spectra of heated powdered samples. Polarized absorption spectra of forsterite at 20-400 C are shown in a graph. Other graphs show the temperature dependence of Fe(++) crystal field bands in olivines, the diffuse reflectance spectra of olivine at 40-400 C, the polarization absorption spectra of orthopyroxene at 30-400 C, the diffuse reflectance spectra of pigeonite at 40-400 C, and unpolarized absorption spectra of lunar pyroxene from Apollo 15 rock 15058.
Document ID
19780057712
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sung, C.-M. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Singer, R. B. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Parkin, K. M. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Burns, R. G. (MIT Cambridge, Mass., United States)
Osborne, M. (Wellesley College Wellesley, Mass., United States)