The age of ferroan anorthosite 60025 - Oldest crust on a young moon?

Details The age of ferroan anorthosite 60025 - Oldest crust on a young moon? The age of ferroan anorthosite 60025 - Oldest crust on a young moon?

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..90..119c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 90, no. 2, Oct. 1988, p. 119-130.

Physics

91

Anorthosite, Earth-Moon System, Lunar Crust, Lunar Rocks, Radioactive Age Determination, Chemical Evolution, Magma, Planetary Evolution, Rare Earth Elements, Terrestrial Planets

Scientific paper

Sm-Nd isotopic data for mineral separates from the ferroan anorthosite 60025, which define a precise isochron of 4.44 + or - 0.02 Ga age, are discussed. This age is about 110 Myr younger than the formation of the first large solid objects in the solar nebula. If the moon is as old as the oldest meteorite, the relatively young age determined for 60025 implies that the magma ocean did not form synchronously with lunar formation or that the magma ocean required over 100 Myr to reach the stage of ferroan anorthosite crystallization. It is proposed that the accumulated body of radiogenic isotope data for lunar rocks permit the moon to be as young as 4.44-4.51 Ga. This is consistent with the idea that the materials that make up the moon were derived from the earth.

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