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Whitman, Jill M; Berger, Wolfgang H (1993): Pliocene-Pleistocene carbon isotope record of foraminifera from DSDP Site 89-586 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.780397, Supplement to: Whitman, JM; Berger, WH (1993): Pliocene-Pleistocene carbon isotope record, Site 586, Ontong Java Plateau. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 333-348, https://doi.org/10.2973/odp.proc.sr.130.030.1993

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Abstract:
Oceanographic changes in the western equatorial Pacific during the past 6 m.y. are inferred from carbon isotopic analyses of planktonic and benthic foraminifers from Ontong Java Plateau (DSDP Site 586). Sample spacing is 1.5 m (ca. 35,000-75,000 yr). An overall trend of d13C toward lighter values is evident for the last 5 m.y. in all four foraminiferal taxa analyzed (G. sacculifer, Pulleniatina, P. wuellerstorfi, and O. umbonatus). This trend is interpreted as an enrichment of the global ocean with 12C, because of the addition of carbon from organic carbon reservoirs (or lack of removal of carbon to such reservoirs), as a consequence of an overall drop in sea level. Differences between shallow- and deep-water d13C decrease slightly during this time interval, suggesting a moderate drop in productivity. This drop is not sufficient to explain the drop in sedimentation rate, however, much of which apparently must be ascribed to winnowing effects.
A marked convergence in the d13C values of planktonic taxa exists within the last 2 m.y. We propose that this convergence indicates nutrient depletion in thermocline waters, caused by the vigorous removal of phosphate in marginal upwelling regions, or by the stripping of intermediate waters in their source regions. No large shifts are seen in the carbon isotope record of the last 6 m.y., in contrast to the oxygen isotope record. Some indication of cyclicity is present, with a period between 0.5 and 1.0 m.y. (especially in the earlier portion of the record).
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -0.497300 * Longitude: 158.498200
Date/Time Start: 1982-11-19T00:00:00 * Date/Time End: 1982-11-19T00:00:00
Event(s):
89-586_Site * Latitude: -0.497300 * Longitude: 158.498200 * Date/Time: 1982-11-19T00:00:00 * Elevation: -2207.0 m * Penetration: 12.029 m * Recovery: 5.328 m * Location: South Pacific * Campaign: Leg89 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 62 cores; 548.7 m cored; 0 m drilled; 97.1% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Whitman, JM; Berger, WH (1993): (Appendix B) Benthic foraminifera in DSDP Site 89-586 sediments. https://doi.org/10.1594/PANGAEA.780394
  2. Whitman, JM; Berger, WH (1993): (Appendix C) Stable carbon isotope ratios of foraminifera at DSDP Site 89-586. https://doi.org/10.1594/PANGAEA.780396
  3. Whitman, JM; Berger, WH (1993): (Appendix A) Grain-size distribution of DSDP Site 89-586 sediments. https://doi.org/10.1594/PANGAEA.780392