Other
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..331r&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Other
7
Basalt, Cooling, Kreep, Lunar Rocks, Petrography, Apollo 15 Flight, Crystallization, Glass, Rates (Per Time), Volcanology
Scientific paper
Most Apollo 15 KREEP basalts have textures indicative of linear cooling rates. Some samples have textures indicative of two-stage cooling. Two-stage cooling is common in volcanic, dynamic environments but cannot be expected in the static environment of crystallization of impact melt sheets, even basinscale ones. Therefore these Apollo 15 KREEP basalts, and by extrapolation all the other clast-free, homogeneous, meteoritic-siderophile-absent Apollo 15 KREEP should be reexamined with the constraint that the Apollo 15 KREEP basalts were produced by igneous processes at 3.9 Ga, but managed to retain the trace element characteristics established at about 4.4 Ga. The common acceptance of total remelting by impact at 3.9 Ga, such as the Imbrium basin event, in the interpretation of the isotopic and chemical data is not permissible.
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