Ce-Nd-Sr Isotope Systematics of Eucrites and Lunar Rocks

Abstract

The La-Ce data of Millbillillie are plotted in Figure 2. The age of Millbillillie #2 is The data for Millbillillie #2 do not fall on the 4.52 Ga ref-erence isochron. There is a possibility that the La-Ce decay system was reset. The fine-grained crystalline clast of Millbillillie #1 made a cluster due to the difficulty in mineral separation. Two different trends between Millbillillie #1 and #2 are also recognized in Figure 2, as well as in the Sm-Nd decay system (Figure 1a) and clearer than it. This fact indicates that Millbillillie is a poly-mict eucrite, too.