Mathematics – Logic
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..381c&link_type=abstract
Earth and Planetary Science Letters, Volume 49, Issue 2, p. 381-392.
Mathematics
Logic
6
Scientific paper
The flux of 226Ra from bottom sediments has been determined from patterns of 226Ra/230Th disequilibrium in ten deep-sea cores from the world oceans. Values range from <~ 0.0015 dpm/cm2 yr (in the Atlantic) to 0.21 dpm/cm2 yr (in the north equatorial Pacific). The flux is poorly related to sediment type, but is inversely correlated in a non-linear fashion with sediment accumulation rate. There is a direct relationship between the production rate of 226Ra near the sediment-water interface (i.e. the integrated 230Th activity in the biologically mixed zone) and the 226Ra flux. The 226Ra concentration in near-bottom water follows the geographic variation in the 226Ra flux. The high flux from north equatorial Pacific sediments especially is reflected in the high bottom water 226Ra concentrations in that area. The data suggest that both rate of circulation and the magnitude of the radium flux influence the near-bottom 226Ra concentration.
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