Computer Science
Scientific paper
Mar 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970e%26psl...8....1p&link_type=abstract
Earth and Planetary Science Letters, Volume 8, Issue 1, p. 1-19.
Computer Science
16
Scientific paper
87Rb-87Sr internal isochrons have been determined for six crystalline rocks from the Sea of Tranquillity, and all yield ages within the narrow range3.65±0.06 × 109yr. Differences in initial (87Sr/86Sr)I define at least two main rock groups which coincide with the two groups indicated by alkali content of the rocks. This demonstrates that at least two magnetic reservoirs were involved in the 3.65 × 109 yr event on the moon. The soil yields a model Rb-Sr age of 4.6 × 109 yr which suggests that it consists of an average over a variety of rock systems of different ages which represent a closed total system 4.6 × 109 yr old or the widespread existence of rocks of 4.6 × 109 yr age. A single peculiar rock fragment from the soil gives a model age of 4.4 × 109 yr.Initial Sr compositions for the lunar rocks and for soil fragments define a narrow range (0.6990-0.6994) whose lower limit is equal to the basaltic achondrite initial Sr. The moon, earth and basaltic achondrites represent planets with Rb/Sr much lower than in the sun. The moon and the basaltic achondrites must have separated from the solar nebula within a time interval of less than 4 × 106 yr. From consideration of Sr-Rb relations, if the moon formed by fission from the earth, it must have occurred prior to 4.4 × 109 yr ago.
Burnett Don S.
Papanastassiou Dimitri Anastassios
Wasserburg Gerald J.
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