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Pichat, Sylvain; Sims, Kenneth W W; Francois, Roger; McManus, Jerry F; Brown Leger, Susan; Albarède, Francis (2004): Major element concentration and radionuclides of equatorial Pacific deep-sea sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.755548, Supplement to: Pichat, S et al. (2004): Lower export production during glacial periods in the equatorial Pacific derived from (231Pa/230Th)xs,0 measurements. Paleoceanography, 19(4), PA4023, https://doi.org/10.1029/2003PA000994

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Abstract:
The (231Pa/230Th)xs,0 records obtained from two cores from the western (MD97-2138; 1°25'S, 146°24'E, 1900 m) and eastern (ODP Leg 138 Site 849, 0°11.59'N, 110°31.18'W, 3851 m) equatorial Pacific display similar variability over the last 85000 years, i.e. from isotopic stages 1 to 5a, with systematically higher values during the Holocene, isotopic stage 3 and isotopic stage 5a, and lower values, approaching the production rate ratio of the two isotopes (0.093), during the colder periods corresponding to isotopic stages 2 and 4. We have also measured the 230Th-normalized biogenic preserved and terrigenous fluxes, as well as major and trace elements concentrations, in both cores. The (231Pa/230Th)xs,0 results combined with the changes in preserved carbonate and opal fluxes at the eastern site indicate lower productivity in the eastern equatorial Pacific during glacial periods. The (231Pa/230Th)xs,0 variations in the western equatorial Pacific (WEP) also seem to be controlled by productivity (carbonate and/or opal). The generally high (231Pa/230Th)xs,0 ratios (>0.093) of the profile could be due to opal and/or MnO2 in the sinking particles. The profiles of (231Pa/230Th)xs,0 and 230Th-normalized fluxes indicate a decrease in exported carbonate, and possibly opal, during isotopic stages 2 and 4 in MD97-2138. Using 230Th-normalized flux, we also show that sediments from the two cores were strongly affected by sediment redistribution by bottom currents suggesting a control of mass accumulation rates by sediment focusing variability.
Project(s):
International Marine Global Change Study (IMAGES)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 0.594560 * Median Longitude: -169.923484 * South-bound Latitude: -0.233300 * West-bound Longitude: 146.236000 * North-bound Latitude: 1.420000 * East-bound Longitude: -110.519710
Date/Time Start: 1991-06-07T23:25:00 * Date/Time End: 1991-06-10T12:04:00
Event(s):
138-849B * Latitude: 0.183050 * Longitude: -110.519710 * Date/Time Start: 1991-06-07T23:25:00 * Date/Time End: 1991-06-10T12:04:00 * Elevation: -3839.1 m * Penetration: 350.5 m * Recovery: 343.78 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 350.5 m cored; 0 m drilled; 98.1 % recovery
MD97-2138 (MD972138) * Latitude: 1.420000 * Longitude: 146.236000 * Recovery: 32.55 m * Campaign: MD106 (IMAGES III - IPHIS) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
MW9106-36BC (BC36) * Latitude: -0.233300 * Longitude: 158.950000 * Elevation: -2311.0 m * Location: Ontong Java Plateau * Campaign: MW9109 * Basis: Moana Wave * Method/Device: Box corer (BC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Pichat, S; Sims, KWW; Francois, R et al. (2004): (Table 1) Major element, opal, carbonate and MnO2 concentration from ODP Hole 138-849B. https://doi.org/10.1594/PANGAEA.755544
  2. Pichat, S; Sims, KWW; Francois, R et al. (2004): (Table 2) 231Pa, 230Th, 238U, 232Th and (231Pa/230Th)xs,0 from ODP Hole 138-849B. https://doi.org/10.1594/PANGAEA.755545
  3. Pichat, S; Sims, KWW; Francois, R et al. (2004): (Table 1) Major element, opal, carbonate and MnO2 concentration for sediment core MD97-2138. https://doi.org/10.1594/PANGAEA.755540
  4. Pichat, S; Sims, KWW; Francois, R et al. (2004): (Table 2) 231Pa, 230Th, 238U, 232Th and (231Pa/230Th)xs,0 for sediment core MD97-2138. https://doi.org/10.1594/PANGAEA.755541
  5. Pichat, S; Sims, KWW; Francois, R et al. (2004): (Table 2) 231Pa, 230Th, 238U, 232Th and (231Pa/230Th)xs,0 from sediment core MW9106-36BC. https://doi.org/10.1594/PANGAEA.755546