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Evidence of thermal metamorphism on the C, G, B, and F asteroids (1993)

Pieters, Carle M. ; Lipschutz, Michael E. ; Hiroi, Takahiro ; [et al.]

In: Other Sources

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Publication Date: 2019-08-28

Description: Reflectance spectra (0.3 to 2.6 micrometers) of 14 C, G, B, and F asteroids and 21 carbonaceous chondrite powders are compared in detail. Only three thermally metamorphosed CM-CI chondrites that have a weak UV absorption are shown to have close counterparts among those asteroids. Reflectance spectra of heated Murchison CM2 chondrite are compared with the average C and G type asteroid spectra. Murchison heated at 600 to 1000 C exhibits a similar weak UV absorption and provides the best analog for those spectra. Comparison of UV absorption strengths between 160 C, G, B, and F asteroids and carbonaceous chondrites suggests that surface minerals of most of those asteroids are thermally metamorphosed at temperatures around 600 to 1000 C.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Science (ISSN 0036-8075); 261; 5124; p. 1016-1018.

Format: text

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