TY - JOUR
T1 - Recent organic carbon accumulation (~100 years) along the Cabo Frio, Brazil upwelling region
AU - Sanders, Christian J.
AU - Caldeira, Pedro P.
AU - Smoak, Joseph M.
AU - Ketterer, Michael E.
AU - Belem, Andre
AU - Mendoza, Ursula M.N.
AU - Cordeiro, Lívia G.M.S.
AU - Silva-Filho, Emmanoel V.
AU - Patchineelam, Sambasiva R.
AU - Albuquerque, Ana Luiza S.
N1 - Funding Information:
This work was supported by Grant # 0050.0048388.08.9 from Geochemistry Network (Rede Temática de Geoquímica) of the Petroleum National Agency (Agência Nacional do Petróleo) and Petrobras, in cooperation with Universidade Federal Fluminense (UFF) with FAPERJ and CAPES support, Grant ( E-26/101.952/2009 ), and a Southern Cross University post-doctoral fellowship to Christian J. Sanders. MEK acknowledges support from the Arizona Technology Research and Innovation Fund (TRIF) for the purchase of the quadrupole ICPMS.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/3/1
Y1 - 2014/3/1
N2 - Six sediment cores were obtained from the Cabo Frio shelf region of coastal Brazil to quantify the accumulation of organic carbon in a highly productive upwelling region. The sampled locations, 10-60km offshore at ~100m water depth, were investigated for excess 210Pb (210Pbex) as well as 239+240Pu fallout activities to determine sedimentary dynamics. The 210Pbex and 239+240Pu dating models show that the sediment accumulation rates varied substantially throughout this complex hydrodynamic system (0.8-5.5mmyr-1). Excess 210Pb and 239+240Pu fluxes indicate lateral transport, with varying intensity along the continental shelf. The stations with the greatest 210Pbex and 239+240Pu sediment inventories are also the sites with the highest carbon accumulation rates (CAR). The total organic carbon (TOC) and total nitrogen (TN) contents, along with the δ13C results, indicate that the organic matter deposited in this region is mainly of marine origin. The results of this work suggest that lateral transport, with varying intensity along the shelf, contribute to the large quantities of marine plankton buried at specific depositional settings in the Cabo Frio upwelling region (~1-8mol of OCcm-2yr-1).
AB - Six sediment cores were obtained from the Cabo Frio shelf region of coastal Brazil to quantify the accumulation of organic carbon in a highly productive upwelling region. The sampled locations, 10-60km offshore at ~100m water depth, were investigated for excess 210Pb (210Pbex) as well as 239+240Pu fallout activities to determine sedimentary dynamics. The 210Pbex and 239+240Pu dating models show that the sediment accumulation rates varied substantially throughout this complex hydrodynamic system (0.8-5.5mmyr-1). Excess 210Pb and 239+240Pu fluxes indicate lateral transport, with varying intensity along the continental shelf. The stations with the greatest 210Pbex and 239+240Pu sediment inventories are also the sites with the highest carbon accumulation rates (CAR). The total organic carbon (TOC) and total nitrogen (TN) contents, along with the δ13C results, indicate that the organic matter deposited in this region is mainly of marine origin. The results of this work suggest that lateral transport, with varying intensity along the shelf, contribute to the large quantities of marine plankton buried at specific depositional settings in the Cabo Frio upwelling region (~1-8mol of OCcm-2yr-1).
KW - Lateral transport
KW - Organic sediments
KW - Pb and Pu geochronology
KW - Sedimentation
KW - TOC/TN molar ratio
KW - δC
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U2 - 10.1016/j.csr.2013.10.009
DO - 10.1016/j.csr.2013.10.009
M3 - Article
AN - SCOPUS:84895072990
SN - 0278-4343
VL - 75
SP - 68
EP - 75
JO - Continental Shelf Research
JF - Continental Shelf Research
ER -