Other
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976moon...15..275b&link_type=abstract
The Moon, vol. 15, June-July 1976, p. 275-314.
Other
1
Fission, Lunar Crust, Lunar Evolution, Petrology, Crystallization, Exothermic Reactions, Lunar Mantle, Lunar Rocks, Magma, Olivine, Pyroxenes
Scientific paper
A previous model for the development of the primitive crust of a fissioned moon proposes that the primitive suite of upland rocks was formed by the disequilibrium crystallization and accumulation of plagioclase, which trapped various amounts of melt and mafics from an equilibriated mixture of crystals and liquids under the growing crust. An improved version of this model is analyzed in detail, and its implications regarding the composition and differentiation of a pyrolite moon of fission origin are discussed. It is found that a cotectic crystallization sequence, in which pyroxene was formed due to the reaction of sinking olivine with the melt at depths of 300 km and less, adequately accounts for the high amounts of olivine observed in the upland rocks and the occurrence of troctolites among the primitive rocks. This sequence also indicates that the release of large amounts of heat by the exothermic reaction, olivine + quartz (in melt) yields pyroxene, set the magma into convective motion after the dunite lower mantle had formed.
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