Mathematics – Logic
Scientific paper
Jul 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970e%26psl...8..411h&link_type=abstract
Earth and Planetary Science Letters, Volume 8, Issue 6, p. 411-419.
Mathematics
Logic
3
Scientific paper
A method of dating sediments and soils is proposed which utilizes a uranium and actinium series dating of buried vertebrate fossils. Nuclide activities of238U,234U and230Th in some of the bones of a Rancholabrean aged faunal assemblage ranges from 43 dpm/g to 298 dpm/g and high231Pa activities were detected in a few bones. The method dates the riverbank Formation east of Sacramento, California, and the overlying San Joaquin soil as103,000 ± 6,000 years. The age is in accordance with cited geological evidence. Chronological migrations of uranium, uranium-uptake and leaching are related to moisture conditions and hardpan formation. In absence of ground waters, slower migrations of uranium in rain waters penetrating the soil profiles results in mean residence times (mrt) of uranium within fossils to be less than the total elapsed time. Where ground water has been present, absorption of uranium by fossils was rapid, the mean residence times of uranium are higher and equal to total elapsed time.234U/238U ratios are lower in the wetter zones where water facilititates some remixing of uranium isotopes. Losses of uranium from some of the fossils are related to carbonate leaching and windows in the hardpan where rain water has penetrated, resulting in excess231Pa activities.
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