NEEP602 Course Notes (Fall 1996)
Resources from Space
TABLE 8. Changes to major lunar features: Mare basalt stage
1. Partial melting of the upper mantle, probably from the base of the crust downward, sequentially produced mare basalts and enhanced the ultramafic character of the upper mantle as a whole.
Basaltic maria partially filled most nearside basins, adding to the gravitational anomalies in Nectaris and younger large basins. Basaltic magma also permeated much of the lunar crust, further contributing to crustal strength.
3. Late-stage pyroclastic eruption of magmas derived from deep-source materials took place in regions under extensional stress, particularly near the edges of young large basins with significant mare basalt fill.
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