History and genesis of lunar troctolite 76535 or: How old is old

Details History and genesis of lunar troctolite 76535 or: How old is old History and genesis of lunar troctolite 76535 or: How old is old

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.2009l&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 2. (A77-34651 15-91) New York, Pergamon

Physics

16

Feldspars, Lunar Evolution, Lunar Rocks, Radioactive Age Determination, Argon Isotopes, Cosmic Rays, Igneous Rocks, Lunar Temperature

Scientific paper

The history of lunar troctolite 76535 was investigated on the basis of information from the Sm-147-Nd-143 mineral isochron age, the Nd-143 evolution, extinct Pu-224, the Kr-81-Kr exposure age and the cosmic ray exposure record. It was found that the troctolite minerals last equilibrated 4.26 plus or minus 0.06 AE ago and that the Sm-Nd system became closed at this time. The rock remained at temperatures where the loss of radiogenic Ar-40 was small.

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