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Radiocarbon Dating, Chronologic Framework, and Changes in Accumulation Rates of Holocene Estuarine Sediments from Chesapeake Bay

Published online by Cambridge University Press:  20 January 2017

Steven M. Colman
Affiliation:
U.S. Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts, 02543, E-mail: scolman@usgs.gov
Pattie C. Baucom
Affiliation:
U.S. Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts, 02543, E-mail: scolman@usgs.gov
John F. Bratton
Affiliation:
U.S. Geological Survey, 384 Woods Hole Road, Woods Hole, Massachusetts, 02543, E-mail: scolman@usgs.gov
Thomas M. Cronin
Affiliation:
U.S. Geological Survey, National Center, Reston, Virginia, 20192
John P. McGeehin
Affiliation:
U.S. Geological Survey, National Center, Reston, Virginia, 20192
Debra Willard
Affiliation:
U.S. Geological Survey, National Center, Reston, Virginia, 20192
Andrew R. Zimmerman
Affiliation:
Virginia Institute of Marine Science, Gloucester Point, Virginia, 23062
Peter R. Vogt
Affiliation:
Naval Research Laboratory, Code 7420, 4555 Overlook Avenue SW, Washington, DC, 20375-5320

Abstract

Rapidly accumulating Holocene sediments in estuaries commonly are difficult to sample and date. In Chesapeake Bay, we obtained sediment cores as much as 20 m in length and used numerous radiocarbon ages measured by accelerator mass spectrometry methods to provide the first detailed chronologies of Holocene sediment accumulation in the bay. Carbon in these sediments is a complex mixture of materials from a variety of sources. Analyses of different components of the sediments show that total organic carbon ages are largely unreliable, because much of the carbon (including coal) has been transported to the bay from upstream sources and is older than sediments in which it was deposited. Mollusk shells (clams, oysters) and foraminifera appear to give reliable results, although reworking and burrowing are potential problems. Analyses of museum specimens collected alive before atmospheric nuclear testing suggest that the standard reservoir correction for marine samples is appropriate for middle to lower Chesapeake Bay. The biogenic carbonate radiocarbon ages are compatible with 210Pb and 137Cs data and pollen stratigraphy from the same sites.

Post-settlement changes in sediment transport and accumulation is an important environmental issue in many estuaries, including the Chesapeake. Our data show that large variations in sediment mass accumulation rates occur among sites. At shallow water sites, local factors seem to control changes in accumulation rates with time. Our two relatively deep-water sites in the axial channel of the bay have different long-term average accumulation rates, but the history of sediment accumulation at these sites appears to reflect overall conditions in the bay. Mass accumulation rates at the two deep-water sites rapidly increased by about fourfold coincident with widespread land clearance for agriculture in the Chesapeake watershed.

Type
Research Article
Copyright
University of Washington

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