Pristine Rocks, Remote Sensing, and the Lunar Magmasphere Hypothesis

Details Pristine Rocks, Remote Sensing, and the Lunar Magmasphere Hypothesis Pristine Rocks, Remote Sensing, and the Lunar Magmasphere Hypothesis

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nvmi.conf...75w&link_type=abstract

Workshop on New Views of the Moon: Integrated Remotely Sensed, Geophysical, and Sample Datasets, p. 75

Other

Geochemistry, Magma, Lunar Exploration, Lunar Surface, Regolith, Kreep, Remote Sensing, Lunar Prospector

Scientific paper

The strongest evidence for the lunar magmasphere hypothesis is still the pronounced geochemical bimodality among pristine nonmare rocks. Magnesium-suite (MgS) rocks have a distinctly higher mg ratio than ferroan anorthositic suite (FAS) cumulates of otherwise similar geochemistry (e.g., Na/Ca, REE, and especially Eu/AI). Well-sampled FAS rocks are uniformly anorthositic, and must have been buoyant over their FeO-rich parent melts. Well-sampled MgS rocks have consistently moderate play contents' and must have been negatively buoyant in relation to their parent melts. Ferroan chemistry is an expected outcome of magmasphere fractionation. MgS chemistry is consistent with origin by localized "serial magmatism," where the primary magmas were prone to assimilate magma ocean residuum (urKREEP) on the way from mantle to crust.

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