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Rb-Sr systematics of Luna 20 and Apollo 16 samples

1972; Elsevier BV; Volume: 17; Issue: 1 Linguagem: Inglês

10.1016/0012-821x(72)90258-0

1385-013X

D. A. Papanastassiou, G. J. Wasserburg,

Space Exploration and Technology

Lunar soils from all missions indicate that an early lunar differentiation process occurred in the interval 4.3–4.6 AE and resulted in the formation of a crust rich in K, Rb, U and Th. An attempt has been made to identify rocks which were formed during this early differentiation event.