Chemistry of the Apollo 12 highland component

Details Chemistry of the Apollo 12 highland component Chemistry of the Apollo 12 highland component

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..241l&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Other

Kreep, Lunar Composition, Lunar Rocks, Apollo 12 Flight, Geochemistry, Lunar Geology, Petrology, Regolith

Scientific paper

Eleven chemical highland groups are identified in Apollo 12 fragments and a range of petrographic types is found. Among the chemical groups, four are newly recognized; one group is a very high-K KREEP-La at 520X with a -Eu anomaly at 50X, and the other three have positive anomalies as follows (1) a poikilitic/granulitic rock with La at 130X, (2) anorthosite with La at 30X and Eu at 90X, and (3) anorthosite with La at 12X and Eu at 25X. The Apollo 12 highland suite is dominated by high-K Kreep and is similar to the Apollo 12 highland suite is dominated by hign-K Kreep and is similar to the Apollo 14 highland suite. The presence of high-K Kreep explains the relatively high LIL contents in the Apollo 12 soils. The plutonic suite data exhibit a trend in Eu anomaly versus longitude. Several parent magmas are suggested to explain the wide variety of plutonic and other highland suites observed at the Apollo 11 and 12 sites.

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