Analysis of small scale lunar gravity anomalies: Implications for crater formation and crustal history

Details Analysis of small scale lunar gravity anomalies: Implications for crater formation and crustal history Analysis of small scale lunar gravity anomalies: Implications for crater formation and crustal history

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........4d&link_type=abstract

Ph.D. Thesis California Inst. of Tech., Pasadena.

Computer Science

1

Gravity Anomalies, Lunar Craters, Lunar Crust, Lunar Evolution, Lunar Gravitation, Igneous Rocks, Impact Damage, Intrusion, Lunar Mantle, Lunar Maria, Meteorite Craters, Porosity

Scientific paper

Anomalies in the local gravity field of the moon which arise from lateral density variations within the planetary body were examined to infer the subsurface structure and possibly characterize the processes which formed these features. Results of the analysis include: (1) young lunar craters have negative Bouguer gravity anomalies most likely caused by the presence of a large lens of low density material; (2) the old, unfilled lunar craters have zero Bouguer anomalies, suggesting that the porosity initially produced by the impact events was removed by the intrusion of igneous material or by compacting of the crust during the seismic shaking which accompanied the formation of the last lunar multiringed basins; (3) the positive Bouguer anomaly of a small, multiringed basin, Grimaldi, is accounted for by the mare material lying within the inner ring, a plug of high density lunar mantle material, and a ring of low density ejecta material; (4) two nonimpact features, Lamont and Marius Hills, have positive Bouguer anomalies most likely associated with intrusive activity within the lunar crust.

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