Composition, structure, and age of the Apollo 16 subregolith basement as deduced from the chemistry of post‐imbrium melt bombs

@inproceedings{Borchardt1986CompositionSA,
  title={Composition, structure, and age of the Apollo 16 subregolith basement as deduced from the chemistry of post‐imbrium melt bombs},
  author={R. Borchardt and Dieter St{\"o}ffler and Bernhard Spettel and Herbert Palme and Heinrich Waenke and Klaus Wacker and Elmar K. Jessberger},
  year={1986}
}
Irregularly shaped, slag-like impact-melt bombs with variolitic crystallization texture, mostly 1 to 10 cm in size, occur throughout the regolith of the Apollo 16 landing site. We have analyzed 16 samples from Stations 11 and 13 near North Ray Crater using the microscope, electron microscope, microprobe, neutron activation, and 40Ar-39Ar age-dating techniques. We interpret the melt rocks as rapidly quenched, high-velocity ejecta (“glass bombs”) from impact craters less than 1.5 km in diameter… CONTINUE READING