Trace elements in basaltic fragments from Luna 16 soils

Details Trace elements in basaltic fragments from Luna 16 soils Trace elements in basaltic fragments from Luna 16 soils

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1539w&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 539.

Other

Lunar Maria, Trace Elements, Basalt, Aluminum Oxides, Lunar Probes, Lunar Soil, Lunar Composition, Fragments, Chemical Elements

Scientific paper

Aluminous mare basalts are the dominant lithology at the Luna 16 landing site in Mare Fecunditatis. For trace element analysis by micro-INAA techniques, we selected 23 of the 52 Luna 16 basaltic soil fragments studied by Kurat et al. (1976) and used a microcoring technique to extract microgram-sized samples from grain mount thin sections. Microprobe analyses suggest that most fragments are typical Luna 16 aluminous mare basalts, whereas one is a very-low-Ti (VLT) basalt. Fifteen fragments have bow-shaped REE patterns similar to those observed in much larger mg-sized Luna 16 fragments. Five other fragments are probably related to the main group Luna 16 basalts, but are either enriched in Ba, LREE, Ta, U and Th or up to a factor of 2-3 more enriched in all REE and incompatible trace elements. Trace element abundances show that three fragments are clearly different from the main group Luna 16 basalts: two samples show almost flat REE patterns and are about a factor of two lower in REE, whereas the third sample is similar in all trace elements to Apollo 17 VLTs. Apparently, this grain has been transported from Mare Serenitatis.

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