Computer Science
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53..400b&link_type=abstract
Earth and Planetary Science Letters, Volume 53, Issue 3, p. 400-408.
Computer Science
26
Scientific paper
The deployment of particle interceptor traps (PITs) in the three inner basins of the Southern California Bight (Santa Barbara, Santa Monica, and San Pedro) where preserved, laminated, bottom sediments occur, provides a natural calibration between the parameters determined with the PITs and those derived from the historical sedimentary deposits. The accumulation rates and chemical composition of the PIT materials compare favorably with these recently deposited bottom sediments. The ratio of the measured particle collection rate to the sediment accumulation rate for these three basins averaged 0.93+/-0.20. Radionuclide (210Pb, 228Th/232Th) and trace element (Fe, Cu, Zn, Cd, Pb) compositions of the PIT materials and surface sediments agree within, generally, 30% in each basin.
An application of PITs as a sampling system in an outer basin (San Nicolas) where the sedimentary record has been obscured by bioturbation is also presented to further demonstrate the utility of PITs for spatial and temporal studies of various aspects of particle transport and sediment deposition. Based on the calibration of the PITs in the three inner basins we conclude from the comparison of the radionuclide and trace element compositions between the PIT materials and surface sediments from the San Nicolas Basin that recently deposited sedimentary material has been mixed by bioturbation with older material from the last several hundred years. Excess 210Pb and the 228Th/232Th activity ratio in the PIT material are 6 and 15 times higher than in the surface sediment. Total Pb and 1N HNO3-leachable Pb are 4- and 8-fold higher in the PIT material.
Bruland Kenneth W.
Franks Robert P.
Landing William M.
Soutar Andrew
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