Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15...25s&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Physics
12
Breccia, Geochemistry, Highlands, Lunar Composition, Lunar Crust, Petrology, Abundance, Apollo 14 Flight, Apollo 16 Flight, Basalt, Electron Probes, Microstructure, Rare Earth Elements, Moon, Highlands, Clasts, Breccias, Apollo 14, 14305, Samples, Lunar, Petrology, Geochemistry, Comparisons, Crust, Alkali, Anorthosite, Compositon, Mineralogy, Trace Elements, Abundance, Fractionation, Magma, Formation, Parent Material, Source, Mixing, Kreep
Scientific paper
Data are presented on the petrography and mineral chemistry of six pristine highland clasts chipped from the polymict lunar breccia 14305. Major and trace elements in the clasts were determined by instrumental neutron activation analysis, and mineral analyses were performed by electron microprobe. Mg-suite clasts have 'eastern' geochemical affinities, reaffirming the importance of local variations in geochemistry. These local variations are superimposed on the moon-wide, longitudinal variations noted by Warren and Wasson (1980). Alkali anorthosites and Mg-suite troctolites and anorthosites are not comagmatic, and cannot be related to a single parent magma by either fractional crystallization or variable assimilation of KREEP. Both magma suites may have assimilated varied amounts of KREEP into distinct parent magmas. Alternatively, alkali anorthosites may have crystallized directly from a KREEP-basalt parent magma. A thick crust of ferroan anorthosite probably never existed on the western lunar nearside, or was removed by basin-forming impacts prior to intrusion of later plutonic suites.
Laul J. C.
Shervais John W.
Smith Matthew R.
Taylor Lawrence A.
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