Lunar mascons - Another model and its implications

Details Lunar mascons - Another model and its implications Lunar mascons - Another model and its implications

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974moon...11....9k&link_type=abstract

The Moon, vol. 11, Sept.-Oct. 1974, p. 9-17.

Astronomy and Astrophysics

Astronomy

3

Astronomical Models, Gravity Anomalies, Lunar Maria, Mascons, Basalt, Lunar Evolution, Lunar Surface, Mathematical Models, Melting, Meteoritic Damage

Scientific paper

A mascon model is proposed in which the mass excess of the mare basalts in the circular maria is supported isostatically by mass deficits at depth. The model predicts the observed positive gravity anomalies surrounded by negative ring anomalies and explains the absence of gravity anomalies over the irregular maria. The model implies that mare basalts were derived by partial melting of a source region at depth due to pressure relief resulting from the excavation of the circular mare basins, and that the crystalline residuum in the source region is of lower density than the original source rock. The trace element enrichment and near cotectic character of Apollo 11 and 12 lavas reported by some investigators may be caused by extensive magma fractionation enroute from an origin in the circular maria to the final, distant emplacement sites.

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