Data report; Dissolved and particulate organic carbon in the deep sediments of IODP Site U1363 near Grizzly Bare Seamount

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doi: 10.2204/iodp.proc.327.202.2015
Author(s): Lin, Huei-Ting; Hsieh, Chih-Chiang; Cowen, James P.; Rappé, Michael S.
Integrated Ocean Drilling Program, Expedition 327 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Hawaii, Department of Oceanography, Honolulu, HI, United States
Other:
Kyoto University, Japan
Integrated Ocean Drilling Program, United States
Lamont-Doherty Earth Observatory, United States
Rosenstiel School of Marine and Atmospheric Science, United States
University of Hawaii-Manoa, United States
University of Southampton, United Kingdom
Tonji University, China
École Normale Supérieure, France
Aarhus Universitet, Denmark
University of Southern California, United States
University of Alaska-Fairbanks, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Juan de Fuca ridge-flank hydrogeology; Expedition 327 of the riserless drilling platform from and to Victoria, British Columbia (Canada); Sites U1362, U1301, 1027, and U1363, 5 July-5 September 2010
Volume Author(s): Fisher, Andrew; Tsuji, Takeshi; Petronotis, Katerina; Mrozewski, Stefan; Becker, Keir; Cowen, James P.; Harris, Michelle; Hulme, Samuel M.; Inderbitzen, Katherine; Ji Fuwu; Masui, Reona; Miyamoto, Hiroki; Morvan, Sylvain; Orcutt, Beth; Rutter, Jennifer; Turner, Amanda G.; Wheat, C. Geoffrey; Winslow, Dustin M.
Source: Proceedings of the Integrated Ocean Drilling Program; Juan de Fuca ridge-flank hydrogeology; Expedition 327 of the riserless drilling platform from and to Victoria, British Columbia (Canada); Sites U1362, U1301, 1027, and U1363, 5 July-5 September 2010, Andrew Fisher, Takeshi Tsuji, Katerina Petronotis, Stefan Mrozewski, Keir Becker, James P. Cowen, Michelle Harris, Samuel M. Hulme, Katherine Inderbitzen, Ji Fuwu, Reona Masui, Hiroki Miyamoto, Sylvain Morvan, Beth Orcutt, Jennifer Rutter, Amanda G. Turner, C. Geoffrey Wheat and Dustin M. Winslow; Integrated Ocean Drilling Program, Expedition 327 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.327, 16p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 51 refs.; illus., incl. sect., 2 tables, sketch map
Summary: Marine sediments are a primary reservoir for the long-term storage of organic matter, and the rate of burial and oxidation of this sedimentary organic material help to regulate both atmospheric oxygen and carbon dioxide concentrations. To evaluate the impact of circulating basement fluid on the preservation of deeply buried organic carbon, sedimentary profiles of dissolved and particulate organic carbon (DOC and POC) near the sediment/basement interface were obtained from sediment coring at Site U1363 during Integrated Ocean Drilling Program Expedition 327. Sedimentary DOC increased from 0.25 mM at 1 m below the sea water/sediment interface to a maximum of 0.86 mM at mid-depth (8-11 meters below seafloor [mbsf]), before subsequently decreasing to a minimum of 0.10 mM at the sediment/basement interface (222.7 mbsf). Thus, the oceanic basement appears to be a net sink for sedimentary DOC. Sedimentary DOC and alkalinity profiles were similar and inversely mirror those of sulfate, suggesting that the buildup of DOC in sediment pore water is related to remineralization of sedimentary POC. The sedimentary POC content at Site U1363 ranged from 47 to 391 µmol-C/g, with δ13C values from -25.3 ppm to -22.4 ppm. The total particulate nitrogen (PN) content ranged from 4.1 to 32.9 µmol-N/g, with d 15 N values from 1.8 ppm to 7.2 ppm and a POC:PN ratio of 12±2 (n=54). No depth-specific systematic variations in POC, PN, POC:PN ratio, δ13C-POC or δ15N-PN were detected, and no significant correlations between sedimentary DOC and POC concentrations were observed.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Alkalinity; Burial; C-13/C-12; Carbon; Cores; East Pacific; Expedition 327; Fluid flow; Geochemistry; Grizzly Bare Seamount; IODP Site U1363; Integrated Ocean Drilling Program; Isotope ratios; Isotopes; Juan de Fuca Ridge; Marine sediments; North Pacific; Northeast Pacific; Ocean floors; Organic carbon; Outcrops; Pacific Ocean; Particulate materials; Pore water; Seamounts; Sediments; Solutes; Stable isotopes
Coordinates: N471719 N471736 W1280145 W1280210
Record ID: 2015044802
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