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Age of an Apollo 15 mare basalt; Lunar crust and mantle evolution

Wasserburg, G. J. and Papanastassiou, D. A. (1971) Age of an Apollo 15 mare basalt; Lunar crust and mantle evolution. Earth and Planetary Science Letters, 13 (1). pp. 97-104. ISSN 0012-821X. doi:10.1016/0012-821x(71)90110-5.

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An internal Rb-Sr isochron for the large basalt boulder 15555 returned from the edge of Hadley rille by the Apollo 15 mission yields an age 3.32 ± 0.06 AE and an initial ⁸⁸Sr/⁸⁶Sr, I = 0.69934 ± 5. This age andI value fall well within the range obtained for the Apollo 12 basalts from the Ocean of Storms and may indicate that extensive lava flows occurred at ∼ 3.3 AE over widespread areas of the moon. The Sr composition of the anorthosite 15415 is as low as that of plagioclase extracted from the Apollo 11 low K rocks. The initial Sr composition of 15415 for an assumed age of 3.3 to 4.6 AE is extremely primitive and provides further evidence for an extremely short formation interval (3 to 1 × 10⁶ yr) of a nonchondritic moon with respect to an origin in time defined by BABI. The initial ⁸⁷Sr/⁸⁶Sr for crystalline rocks returned from all lunar missions is correlated with the concentration of Rb and correspondingly K, U and Th. This correlation places distinctive constraints on the evolution of lunar magmas and the internal structure of the moon.

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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:We thank A.L. Albee for a continuing interest and support. J. Brown, T. Wen and Lily Ray followed each sample through demanding stages of Rb and Sr evolution. This work was supported by NASA under contract NAS-9-8074.
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Caltech Division of Geological and Planetary Sciences2087
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ID Code:117928
Deposited By: Tony Diaz
Deposited On:02 Dec 2022 19:51
Last Modified:02 Dec 2022 19:51

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