[PPS08-P11] U-Pb systematics of lunar meteorite NWA 2977
In this study, in order to investigate the thermal history of NWA 2977, we carried out the in-situ U-Pb dating of phosphate grains in/out of the SMV, using Nanoscale Secondary Ion Mass Spectrometer (NanoSIMS) at the Atmosphere and Ocean Research Institute, University of Tokyo. Most of the phosphates give a crystallization age of 3132±67 Ma (1σ). Whereas, one grain out of the SMV shows a slightly disturbed U-Pb systematics, indicating the very recent shock event (< 346 Ma). At the conference, we also discuss μ-value (238U/204Pb) of NWA2977.