Processes controlling the regional distribution of 210Pb, 226Ra and anthropogenic zinc in estuarine sediments

Details Processes controlling the regional distribution of 210Pb, 226Ra and anthropogenic zinc in estuarine sediments Processes controlling the regional distribution of 210Pb, 226Ra and anthropogenic zinc in estuarine sediments

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..76...23h&link_type=abstract

Earth and Planetary Science Letters, Volume 76, Issue 1-2, p. 23-34.

Physics

8

Scientific paper

The concentration of 226Ra in bottom sediments in Chesapeake Bay is lower than in incoming sediments and decreases systematically in the seaward direction, reflecting both a seaward increase in sediment grain size and a displacement of Ra from sediments as salinity increases. The amount of 226Ra lost from sediments approximately balances that gained by the water. In the seaward 150 km of this estuary, where atmospheric deposition is the dominant 210Pbex source, the 210Pbex/Org-C ratio is virtually constant in surface samples because the production of carbon is apparently regulated so as to be roughly constant per unit area. From independent productivity estimates, about 10% of the carbon is found to survive remineralization in the estuary long enough to be incorporated into surface sediments. Zinc is enriched in surface sediments of the northern two-thirds of the Bay by a factor of 2-3 over shales. The Znex/Org-C ratio decreases systematically southward, unlike the 210Pb/Org-C ratio. This reflects a regional decline southward in deposition of anthropogenic Zn from the atmosphere. A negative 210Pb anomaly is the most distinctive indicator of sediments deposited by a major flood in 1972 and testifies to the importance of such events in estuarine sedimentation.

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