The 25-km Discontinuity: Implications for Lunar History

Details The 25-km Discontinuity: Implications for Lunar History The 25-km Discontinuity: Implications for Lunar History

Oct 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973sci...182..158s&link_type=abstract

Science, Volume 182, Issue 4108, pp. 158-161

Mathematics

Logic

9

Scientific paper

The lunar velocity profile and laboratory data on terrestrial and lunar rocks are constraints on models of lunar history. They show that shockinduced microcracks are absent from the rocks present in the moon today at depths of 25 to 60 kilometers. All possible causes of this observation are examined, and the most likely explanations are that either the rocks at depths of 25 to 60 kilometers formed after the major impacts ceased or the microcracks have annealed at temperatures of about 600 degrees C over geologically long times.

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