Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8137011 | Icarus | 2015 | 16 Pages |
Abstract
Mineralogically diagnostic spectral parameters extracted from this new data are most consistent with a surface assemblage of fine-grained intimately mixed olivine (â¼60-70%, â¼Fo61-71) and low nickel (<â¼7-8% Ni) NiFe metal. The Fo estimate is consistent with previous estimates (Fo66±5) by Sanchez et al. (Sanchez, J.A., Reddy, V., Kelley, M.S., Cloutis, E.A., Bottke, W.F., Nesvorný, D., Lucas, M.P., Hardersen, P.S., Gaffey, M.J., Abell, P.A., Le Corre, L. [2014]. Icarus 228, 288-300), but not with the estimate (â¼Fo90) of Sunshine et al. (Sunshine, J.M., Bus, S.J., Corrigan, C.M., McCoy, T.J., Burbine, T.H. [2007]. Meteorit. Planet. Sci. 42, 155-170). The surface assemblage appears to contain a small component (â¼8-10%) of igneous pyroxene (weakly constrained at â¼Fs50Wo10). The parent lithology of the surface regolith may be similar to a pallasite assemblage, although none of the three known types of pallasites are good mineralogical matches.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
Michael J. Gaffey, Vishnu Reddy, Sherry Fieber-Beyer, Edward Cloutis,