|Southeastern Section - 57th Annual Meeting (10–11 April 2008)|
|Paper No. 31-4|
|Presentation Time: 1:30 PM-5:30 PM|
SEDIMENT CHRONOLOGY TO AID IN HISTORICAL ANALYSIS OF SEDIMENTATION RATES, PCB AND TRACE METAL INFLUXES IN LAKE ANNA SEDIMENTS, VIRGINIA
BROWN, Virginia K., Earth and Environmental Sciences, University of Mary Washington, 1301 College Avenue, Fredericksburg, VA 22401, email@example.com, ARMENTROUT, Gail, Department of Chemistry, University of Mary Washington, Fredericksburg, VA 22401, GIANCARLO, Leanna, Chemistry, University of Mary Washington, Fredericksburg, VA 22401, and ODHIAMBO, Ben K., Earth and Environmental Sciences, University of Mary Washington, Fredericksburg, VA 22401|
Damming of the North Anna River in 1972 created Lake Anna, a cooling water source for the Dominion nuclear power plant as well as a popular recreation site in Spotsylvania and Orange counties, Virginia. Sediment cores from seven locations within the lake and three locations in the adjoining Waste Heat Treatment Facilities (WHTF) were analyzed for 210Pb and polychlorinated biphenyls (PCBs) to examine the environmental evolution of the reservoir system. Given the history of mining in the watershed, sediment samples were also analyzed for Al, Ba, Zn, Cd, Cu, Fe, Mn, and Pb to establish their distribution and loading history in the lake sediments. Based on previous studies, increased concentrations of PCBs were found in fish tissue from Lake Anna. The source of PCBs in the lake is still unknown; therefore, dated sediment cores provide ability of historical analysis and information about possible upland erosion and source sites for both PCBs and trace metals.
210Pb results suggest that sediment accumulation in the lake has been relatively low, but varies from 0.082 g cm-2y-1 at core 1 in the upper sections to 0.054 g cm-2y-1 at core 7 in the mid-lower reaches. The CRS model results display steady increase in accumulation rates with a slightly higher modern rates probably reflection the modern changes in the watershed. In addition, the 210Pb results shows that sediments above 13 cm represent post inundation lacustrine deposits whereas below are predominantly pre-1972 fluvial deposits.
Southeastern Section - 57th Annual Meeting (10–11 April 2008)
General Information for this Meeting
|Session No. 31--Booth# 15|
Undergraduate Research Session (Posters) II
Hilton Charlotte University Place: University Lake Ballroom Suites A, B, C
1:30 PM-5:30 PM, Friday, 11 April 2008
Geological Society of America Abstracts with Programs, Vol. 40, No. 4, p. 73
© Copyright 2008 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.