Other
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31...31k&link_type=abstract
Earth and Planetary Science Letters, Volume 31, Issue 1, p. 31-36.
Other
7
Scientific paper
Unsupported 226Ra (t1/2 = 1620 years) in marine sediments can provide a basis for measuring rates of accumulation of the order of centimeters per thousand years. The excess radium apparently enters the sediments incorporated in phytoplankton. The sensitivity of the method depends upon the initial value of the unsupported 226Ra and of the value of 230Th, a parent of 226Ra, in the sedimentary components. 226Ra dating was applied to a sediment taken from the slope of the San Clemente Basin in the Southern California coastal region. Rates of sedimentation over two half-lives of the nuclide were found to be either 5.2 or 5.3 cm/1000 years depending upon which of two models for the geochronology is used. One model assumes that the 230Th brings to the deposit an amount of 226Ra in equilibrium with it. The other is based upon the growth of the 226Ra from the 230Th in the sedimentary components. s238+239Pu and 210Pb levels in the upper strata indicated sedimentation rates of the order of 100-500 cm/1000 years, i.e. much faster accumulations. We suggest these derived rates are spurious and reflect bioturbative activities of surface-living organisms.
Bruland K.
Goldberg David E.
Koide Minoru
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