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Science 20 August 1993:
Vol. 261. no. 5124, pp. 1016 - 1018
DOI: 10.1126/science.261.5124.1016
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Articles

Evidence of Thermal Metamorphism on the C, G, B, and F Asteroids

Takahiro Hiroi 1, Carlé M. Pieters 2, Michael E. Zolensky 3, and Michael E. Lipschutz 4

1 SN3, NASA Johnson Space Center, Houston, TX 77058
2 Department of Geological Sciences, Brown University, Providence, RI 02912
3 SN2, NASA Johnson Space Center, Houston, TX 77058
4 Department of Chemistry, Purdue University, West Lafayette, IN 47907

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-Cl chondrites that have a weak ultraviolet 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 ultraviolet absorption and provides the best analog for those spectra. Comparison of ultraviolet 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.

Submitted on March 29, 1993
Accepted on July 1, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Extraterrestrial Water.
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The flux of meteorites to Antarctica.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)