Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010m%26ps...45.1929z&link_type=abstract
Meteoritics & Planetary Science, Volume 45, Issue 12, pp. 1929-1947.
Other
2
Scientific paper
Northwest Africa (NWA) 2977 is an olivine-gabbro lunar meteorite that has a distinctly different petrographic texture from other lunar basalts. We studied this rock with a series of in situ analytical methods. NWA 2977 consists mainly of olivine and pyroxene with minor plagioclase. It shows evidence of intense shock metamorphism, locally as high as shock-stage S6. Olivine adjacent to a melt vein has been partially transformed into ringwoodite and Al,Ti-rich chromite grains have partially transformed into their high-pressure polymorph (possibly CaTi2O4-structure). Olivine in NWA 2977 contains two types of lithic inclusions. One type is present as Si,Al-rich melt inclusions that are composed of glass and, in most cases, dendritic pyroxene. The other type is mafic and composed of relatively coarse-grained augite with accessory chromite, RE-merrillite, and baddeleyite. Two Si,Al-rich melt inclusions are heavy rare earth elements (REE) enriched, whereas the mafic inclusion has high REE concentrations and a KREEP-like pattern. The mafic inclusion could be a relict fragment captured during the ascent of the parent magma of NWA 2977, whereas the Si,Al-rich inclusions may represent the original NWA 2977 melt. The calculated whole-rock composition has a KREEP-like REE pattern, suggesting that NWA 2977 has an affinity to KREEP rocks. Baddeleyite has recorded a young crystallization age of 3123 ± 7 Ma (2σ), which is consistent with results from previous whole-rock and mineral Sm-Nd and Rb-Sr studies. The petrography, mineralogy, trace element geochemistry, and young crystallization age of NWA 2977 support the possibility of pairing between NWA 2977 and the olivine-gabbro portion of NWA 773.
Floss Christine
Hsu Wei-Biao
Li Qiu-Li
Li Xian-Hua
Liu Yang
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