Sm-Nd isotopic systematics and REE abundance studies of the ALH-765 eucrite

Analyses of Sm-Nd systematics and REE concentrations were carried out for the whole rock and mineral separates from the ALH-765 meteorite. A Sm-Nd age of 4.52 + or - 0.09 (2 sigma) b.y. and an initial Nd-143/Nd-144 ratio of 0.50675 + or 0.00011 (2 sigma) have been obtained. The previously reported Ce irregularities have been re-examined in this work. The large Ce anomalies and some minor Sm-Nd system disturbances observed for the meteorite may be interpreted as results of terrestrial weathering effects.