@article {2092, title = {Organic carbon deposition on the North Carolina continental slope off Cape Hatteras (USA)}, journal = {Deep-Sea Research Part Ii-Topical Studies in Oceanography}, volume = {49}, year = {2002}, note = {607kxTimes Cited:31 Cited References Count:77 }, month = {2002}, pages = {4687-4709}, abstract = {The continental slope off Cape Hatteras, NC is a region of high sediment accumulation and organic matter deposition. Sediment accumulation rates range from 3 to 151 cm kyr(-1). Organic carbon deposition rates are 5-13 moles C m(-2) yr(-1), the highest reported for the slope off the eastern US. Burial efficiencies are 3-40\%. The organic matter deposited is marine in origin and a mix of old and young particles. High organic carbon deposition rates support remineralization throughout the upper 2-3 m of sediment. Deep bioirrigation to depths of 60-100 cm within the seabed affects the biogeochemistry of the sediments by extending the zone of sulfate reduction and by steepening DIC porewater gradients through the non-local exchange of porewater. Stable and radiocarbon isotope mixing curves for porewater dissolved inorganic carbon (DIC) indicate that the dominant source of DIC accumulating in the upper 2-3 m of the seabed is of nearly uniform delta(13)C (-21.10parts per thousand) and Delta(14)C (-546parts per thousand.). (C) 2002 Elsevier Science Ltd. All rights reserved.}, keywords = {anaerobic methane oxidation, early diagenesis, margin, marine-sediments, MATTER, middle-atlantic-bight, sea-floor, shelf, south, waters}, isbn = {0967-0645}, author = {Thomas, C. J. and Blair, N. E. and Alperin, M. J. and DeMaster, D. J. and Jahnke, R. A. and Martens, C. S. and Mayer, L.} }