Lithologies contributing to the clast population in Apollo 17 LKFM basaltic impact melts

Details Lithologies contributing to the clast population in Apollo 17 LKFM basaltic impact melts Lithologies contributing to the clast population in Apollo 17 LKFM basaltic impact melts

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ga17.conf...42n&link_type=abstract

In Lunar Science Inst., Workshop on Geology of the Apollo 17 Landing Site p 42-44 (SEE N93-18786 06-91)

Computer Science

Basalt, Igneous Rocks, Impact Melts, Lithology, Lunar Crust, Lunar Geology, Lunar Rocks, Lunar Soil, Minerals, Anorthosite, Apollo 17 Flight, Breccia, Highlands, Lunar Landing Sites, Olivine, Pyroxenes

Scientific paper

LKFM basaltic impact melts are abundant among Apollo lunar samples, especially those from Apollo 15, 16, and 17. They are generally basaltic in composition, but are found exclusively as impact melts. They seem to be related to basins and so could represent the composition of the lower lunar crust. They contain lithic clasts that cannot be mixed in any proportion to produce the composition of the melt matrix; components rich in transition elements (Ti, Cr, Sc) and REE are not considered. To search for the mysterious cryptic component, we previously investigated the mineral clast population in two Apollo 14 LKFM basaltic impact melts, 15445 and 15455. The cryptic component was not present in the mineral clast assemblage of these breccias either, but some olivine and pyroxene grains appeared to be from lithologies not represented among identified igneous rocks from the lunar highlands. In addition, none of the mineral clasts could be unambiguously assigned to a ferroan anorthosite source. We have now extended this study to Apollo 17, starting with two LKFM impact melt breccias (76295 and 76315) from the Apollo 17 station 6 boulder. The results from the study are presented.

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