The Lunar Devitrified Glass Spherules: Implications for the Origin of Meteoritic Chondrules

Details The Lunar Devitrified Glass Spherules: Implications for the Origin of Meteoritic Chondrules The Lunar Devitrified Glass Spherules: Implications for the Origin of Meteoritic Chondrules

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1167s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1167

Computer Science

4

Chondrules: Formation, Melt: Impact, Spherules: Lunar

Scientific paper

Devitrified glass spherules (DGS) from three thin sections of Apollo 14 regolith breccias (14318, 6; 14318, 46 and 14315, 20) have been classified (type X, equant plagioclase, and type Y, plagioclase lathes both in a devitrified mafic mesostasis), the abundance and size distributions determined and their bulk compositions and the compositions of plagioclase and mesostasis in type Y have been determined. The abundance and size distributions of the DGS resembled those of chondrules in the CM chondrite Murchison. Their coarse textures suggest fairly slow cooling (<1 degree C/s). The bulk compositions of the DGS do not resemble any of the regoliths of the Apollo sites, including Apollo 14, or any of the common impact glasses, but resemble those of impact spherules from the lunar meteorites. It is suggested that the DGS are ejecta from the Imbrium impact and that only impact events of this size are capable of producing melt spherules with sufficiently slow cooling rates and the long free flight times required on the moon. Smaller impacts produce glassy spherules and agglutinates. While much remains unclear, difficulties with a nebula origin and new developments in chondrule chronology, asteroid surfaces and impact ejecta behavior, mean that the formation of meteoritic chondrules by impact is a reasonable possibility to explore.

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