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

Details Evidence of thermal metamorphism on the C, G, B, and F asteroids Evidence of thermal metamorphism on the C, G, B, and F asteroids

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...261.1016h&link_type=abstract

Science (ISSN 0036-8075), vol. 261, no. 5124, p. 1016-1018.

Astronomy and Astrophysics

Astronomy

64

Asteroids, Astronomical Spectroscopy, Carbonaceous Chondrites, Metamorphism (Geology), Magnesium, Murchison Meteorite, Reflectance, Silicates, Ultraviolet Absorption

Scientific paper

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.

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