Other
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..26...69b&link_type=abstract
Earth and Planetary Science Letters, vol. 26, no. 1, May 1975, p. 69-80.
Other
3
Geochronology, Lunar Crust, Lunar Evolution, Lunar Rocks, Radioactive Age Determination, Apollo Flights, Chemical Composition, Geochemistry, Petrology, Solar Wind
Scientific paper
Measurements of Rb-Sr systematics, K-Ar gas retention ages, and the isotopic compositions of He, Ne, and Ar have been performed for lunar troctolite 76535. Other investigators have presented evidence that this important rock formed as a cumulate at depth, which would make it an important link in the early chronology of the moon. Rb-Sr data do not define an isochron. Total Ar-40/K ages of whole rock and plagioclase range from 4.40-4.54 b.y. The trapped Ne and Ar in 76535 cannot be uniquely characterized as either 'planetary derived' or solar wind derived, but appear to have characteristics of both. The data suggest that 76535 formed 4.3-4.6 b.y. ago, and the accumulation process and/or subsequent annealing may have incorporated excess noble gases. Separation of radiogenic parents and daughters with incomplete isotopic equilibration may also have occurred during cooling or during a subsequent 'event'.
Bansal B. M.
Bogard Donald D.
Nyquist Larry E.
Shih Chia-You
Wiesmann Henry
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