A search for spectral alteration effects in chondritic gas-rich breccias

Details A search for spectral alteration effects in chondritic gas-rich breccias A search for spectral alteration effects in chondritic gas-rich breccias

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept...85b&link_type=abstract

In NASA, Washington, Reports of Planetary and Geology and Geophysics Program, 1986 p 85-86 (SEE N87-23341 16-91)

Physics

Geophysics

Asteroids, Breccia, Chemical Composition, Chondrites, Regolith, Absorption Spectra, Albedo, Metals, Spectrum Analysis

Scientific paper

Several samples of gas-rich breccias were selected, including slabs of the Kapoeta howardite, the ordinary chondrites Dubrovnik, Cangas de Onis, and Dimmit. Numerous 0.8 to 2.5 micron reflection spectra of selected areas on sawed or broken surfaces were measured with the Planetary Geosciences Division spectrogoniometer. While these spectra are not directly comparable to those of powered samples, comparisons within the data set should reveal any spectral differences due to weathering. These results indicate that unknown regolith processes do not confer the ordinary-chondrite parent bodies with an altered layer exhibiting S-class spectral properties. This is consistent with recent interpretations of the new Q-class of asteroids as the ordinary-chondrite parent bodies. However, significant spectral effects do occur in asteroid regoliths: darkening and suppression of absorption bands in highly shocked material, as seen previously in the so-called black chondrites; and segregation of metal in large impact melt pools on chondritic asteroids, which may have achondritic spectra. Neither of these effects is likely to be significant in interpreting current integral-disk spectra, but should be searched for in spectral maps returned by future spacecraft.

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