Prokopenko, Maria G; Hammond, Douglas E; Spivack, Arthur J; Stott, Lowell D (2006): Sediment and pore water C and N composition of ODP Holes 201-1227A and 201-1230A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.773410, Supplement to: Prokopenko, MG et al. (2006): Impact of long-term diagenesis on d15N of organic matter in marine sediments: Sites 1227 and 1230. In: Jørgensen, BB; D'Hondt, SL; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 201, 1-30, https://doi.org/10.2973/odp.proc.sr.201.117.2006
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Abstract:
This study addresses the problem of diagenetic fractionation of d15N in sedimentary organic matter by constructing isotopic mass balances for the sedimentary nitrogen and pore water ammonium at two Ocean Drilling Program (ODP) sites, 1227 and 1230. At Site 1230, ammonium production flux integrated through the sedimentary column indicates that >60% of organic matter is lost to decomposition. The d15N of pore water ammonium is <0.7 per mil different from that of the sedimentary organic matter, which implies that very little isotopic fractionation is associated with degradation of organic matter at this site. The constant d15N of the solid-phase sedimentary nitrogen through the whole profile supports this conclusion. Atomic C/N ratios (9-12) indicate that organic matter at this site is primarily of marine origin. At Site 1227, the sedimentary organic matter appears to be a mixture of terrestrial and marine components. Ammonium is ~4 heavier than the organic matter. The observed isotopic enrichment of pore water ammonium relative to the sedimentary nitrogen might indicate either the preferential decomposition of isotopically heavier marine fraction of the organic matter, or possibly, a nonsteady-state condition of the ammonium concentration and d15N profiles. Interpretation of the results at Site 1227 is further complicated by the contribution of ammonium with d15N of ~4 per mil that is diffusing upward from Miocene brines.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -9.051800 * Median Longitude: -80.269665 * South-bound Latitude: -9.112550 * West-bound Longitude: -80.583500 * North-bound Latitude: -8.991050 * East-bound Longitude: -79.955830
Date/Time Start: 2002-02-28T13:00:00 * Date/Time End: 2002-03-16T22:35:00
Event(s):
201-1227A * Latitude: -8.991050 * Longitude: -79.955830 * Date/Time Start: 2002-02-28T13:00:00 * Date/Time End: 2002-03-02T05:50:00 * Elevation: -427.5 m * Penetration: 151.1 m * Recovery: 100.51 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 151.1 m cored; 0 m drilled; 66.5 % recovery
201-1230A * Latitude: -9.112550 * Longitude: -80.583500 * Date/Time Start: 2002-03-11T00:38:00 * Date/Time End: 2002-03-16T22:35:00 * Elevation: -5086.2 m * Penetration: 278.3 m * Recovery: 187.33 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 277.3 m cored; 1 m drilled; 67.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Prokopenko, MG; Hammond, DE; Spivack, AJ et al. (2006): (Table T3) Sediment and pore water composition of ODP Hole 201-1227A. https://doi.org/10.1594/PANGAEA.773402
- Prokopenko, MG; Hammond, DE; Spivack, AJ et al. (2006): (Table T1) Sediment and pore water composition of ODP Hole 201-1230A. https://doi.org/10.1594/PANGAEA.773398