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Filippelli, Gabriel M; Delaney, Margaret Lois (1996): Phosphorus partition and acumulation rates in sediments of ODP Legs 130 and 138 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.708079, Supplement to: Filippelli, GM; Delaney, ML (1996): Phosphorus geochemistry of Equatorial Pacific sediments. Geochimica et Cosmochimica Acta, 60(9), 1479-1495, https://doi.org/10.1016/0016-7037(96)00042-7

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Abstract:
Understanding phosphorus (P) geochemistry and burial in oceanic sediments is important because of the role of P for modulating oceanic productivity on long timescales. We investigated P geochemistry in seven equatorial Pacific sites over the last 53 Ma, using a sequential extraction technique to elucidate sedimentary P composition and P diagenesis within the sediments. The dominant P-bearing component in these sediments is authigenic P (61-86% of total P), followed in order of relative dominance by iron-bound P (7-17%), organic P (3-12%), adsorbed P (2-9%), and detrital P (0-1%). Clear temporal trends in P component composition exist. Organic P decreases rapidly in younger sediments in the eastern Pacific (the only sites with high sample resolution in the younger intervals), from a mean concentration of 2.3 µmol P/g sediment in the 0-1 Ma interval to 0.4 µmol/g in the 5- 6 Ma interval. Over this same time interval, decreases are also observed for iron-bound P (from 2.1 to 1.1 µmol P/g) and adsorbed P (from 1.5 to 0.7 µmol P/g). These decreases are in contrast to increases in authigenic P (from 6.0-9.6 µmol P/g) and no significant changes in detrital P (0.1 µmol P/g) and total P (12 µmol P/g).
These temporal trends in P geochemistry suggest that (1) organic matter, the principal shuttle of P to the seafloor, is regenerated in sediments and releases associated P to interstitial waters, (2) P associated with iron-rich oxyhydroxides is released to interstitial waters upon microbial iron reduction, (3) the decrease in adsorbed P with age and depth probably indicates a similar decrease in interstitial water P concentrations, and (4) carbonate fluorapatite (CFA), or another authigenic P-bearing phase, precipitates due to the release of P from organic matter and iron oxyhydroxides and becomes an increasingly significant P sink with age and depth. The reorganization of P between various sedimentary pools, and its eventual incorporation in CFA, has been recognized in a variety of continental margin environments, but this is the first time these processes have been revealed in deep-sea sediments. Phosphorus accumulation rate data from this study and others indicates that the global pre-anthropogenic input rate of P to the ocean (20x10**10 mol P/yr) is about a factor of four times higher than previously thought, supporting recent suggestions that the residence time of P in the oceans may be as short as 10000-20000 years.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 2.159473 * Median Longitude: -166.157613 * South-bound Latitude: -3.094930 * West-bound Longitude: 156.625000 * North-bound Latitude: 7.921310 * East-bound Longitude: -90.480760
Date/Time Start: 1990-01-31T00:45:00 * Date/Time End: 1991-08-09T06:00:00
Event(s):
130-803D * Latitude: 2.433000 * Longitude: 160.541000 * Date/Time Start: 1990-01-31T00:45:00 * Date/Time End: 1990-02-07T03:30:00 * Elevation: -3412.2 m * Penetration: 656 m * Recovery: 494.96 m * Location: North Pacific Ocean * Campaign: Leg130 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 71 core; 656 m cored; 0 m drilled; 75.5 % recovery
130-804B * Latitude: 0.937000 * Longitude: 161.650000 * Date/Time Start: 1990-02-08T07:00:00 * Date/Time End: 1990-02-08T23:30:00 * Elevation: -3860.7 m * Penetration: 137.7 m * Recovery: 141.61 m * Location: North Pacific Ocean * Campaign: Leg130 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 137.7 m cored; 0 m drilled; 102.8 % recovery
130-804C * Latitude: 0.937000 * Longitude: 161.650000 * Date/Time Start: 1990-02-08T23:30:00 * Date/Time End: 1990-02-10T18:30:00 * Elevation: -3861.1 m * Penetration: 312.5 m * Recovery: 273.78 m * Location: North Pacific Ocean * Campaign: Leg130 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 312.5 m cored; 0 m drilled; 87.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 130-803D sediments. https://doi.org/10.1594/PANGAEA.708070
  2. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 130-804B sediments. https://doi.org/10.1594/PANGAEA.708071
  3. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 130-804C sediments. https://doi.org/10.1594/PANGAEA.708072
  4. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 130-806B sediments. https://doi.org/10.1594/PANGAEA.708073
  5. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 130-807A sediments. https://doi.org/10.1594/PANGAEA.708074
  6. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 130-807C sediments. https://doi.org/10.1594/PANGAEA.708075
  7. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 138-844B sediments. https://doi.org/10.1594/PANGAEA.708076
  8. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 138-846B sediments. https://doi.org/10.1594/PANGAEA.708077
  9. Filippelli, GM; Delaney, ML (1996): (Appendix A) Phosphorus partition and acumulation rates in ODP Hole 138-851B sediments. https://doi.org/10.1594/PANGAEA.708078