Glassy Spherules in Suevite from the Reis Crater, Germany, with Implications for the Formation of Meteoritic Chondrules

Details Glassy Spherules in Suevite from the Reis Crater, Germany, with Implications for the Formation of Meteoritic Chondrules Glassy Spherules in Suevite from the Reis Crater, Germany, with Implications for the Formation of Meteoritic Chondrules

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1165s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1165

Computer Science

2

Chondrules: Formation, Impact Melt, Melt Spherules, Ries Crater: Germany, Suevite

Scientific paper

In order to constrain impact theories for the origin of meteoritic chondrules, we have examined 53 glassy spherules (with a wide range of devitrification but on a fine scale), 5 lithic spherules, 10 accretionary spherules, and two irregular glass fragments (of similar size to the spherules) from the suevite of the Ries Crater in Germany. These objects indicate that size-sorted glassy spherules can be produced by impact although in the case of the Ries impact they are rare. Except when badly weathered, the spherules have the same composition as the macroscopic glasses. Ballistic calculations for the Ries impact and laboratory experiments suggest that little or no devitrification should have occurred during free-flight, and that the devitrification that is observed occurred subsequently. The lack of coarse-grained devitrification textures in the spherules is not an argument against the formation of meteoritic chondrules by impact, but is the result of very fast cooling rates for Ries ejecta. The rarity of the glassy spherules, compared to meteoritic chondrules, cannot be addressed until we have a better understanding of nature of asteroid surfaces and processes occurring during their early impact history.

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