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87Rb87Sr age of soils and rock from Mare Crisium Luna 24

1978; Elsevier BV; Volume: 16; Issue: 2 Linguagem: Inglês

10.1016/0031-9201(78)90081-x

1872-7395

J. L. Birck, Claude J. Allègre,

Archaeology and ancient environmental studies

Abstract The soil and one gabbroic fragment from Mare Crisium, brought back by the Luna-24 mission, have been measured through the 87 Rb/ 87 Sr method. The soil is one of the least radiogenic from the moon, comparable with Luna-16 soils. The gabbroic rock, which has a very low Rb/Sr ratio, gives an internal isochron age of 3.74 ± 0.58 Ga and an initial Sr ratio of 0.699085 ± 0.000070.