Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data LAST UPDATE: 1/2011 (Original receipt by WDC Paleo) CONTRIBUTORS: Pichat, S., K.W.W. Sims, R. Francois, J.F. McManus, S. Brown-Leger, and F. Albarède. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2011-004 WDC PALEO CONTRIBUTION SERIES CITATION: Pichat, S., et al. 2010. Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2011-004. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Pichat, S., K.W.W. Sims, R. François, J.F. McManus, S. Brown Leger, and F. Albarède. 2004. Lower export production during glacial periods in the equatorial Pacific derived from (231Pa/230Th)xs,0 measurements in deep-sea sediments. Paleoceanography, 19, PA4023, doi:10.1029/2003PA000994. 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 (Ocean Drilling Program Leg 138 Site 849, 0°11.59'N, 110°31.18'W, 3851 m) equatorial Pacific display similar variability over the last 85,000 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 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. ADDITIONAL REFERENCE: Mix, A.C., N.G. Pisias, W. Rugh, J. Wilson, A. Morey, and T.K. Hagelberg. 1995. Benthic foraminifer stable isotope record from site 849 (0-5 Ma): Local and global climate changes. Proc. Ocean Drill. Program Sci. Results, 138, 371-412. GEOGRAPHIC REGION: Eastern Equatorial Pacific PERIOD OF RECORD: 85 KYrBP - present FUNDING SOURCES: French Minister of Research, EURODOC grant of Region Rhone-Alpes (SAFIR-980065327), CNRS-NSF grant, US National Science Foundation, Mellon awards. DESCRIPTION: 230Th, 231Pa, 232Th, 238U activities, (231Pa/230Th)xs,0 ratio, opal, carbonate, MnO2 and major elements concentrations for ODP849. Radionuclide concentrations were obtained by isotope dilution SF-ICP-MS. Major elements concentrations were measured by ICP-AES. Opal, carbonate and MnO2 were determined by normative calculations. Age model is based on oxygen isotope stratigraphy on Cibicides wuellerstorfi (Mix et al., 1995). ODP Site 849: 0°11.59'N, 110°31.18'W, 3851 m water depth. DATA: Table 1: 238U and 232Th activities, 230Th and 231Pa excess activities decay corrected to the time of deposition and (230Th/231Pa) excess activity ratios decay corrected to the time of deposition for ODP849 (ODP Leg 138, Site 849). Age model is based on oxygen isotope stratigraphy on Cibicides wuellerstorfi (Mix et al., 1995). -a, -b, -c: full replicates (dissolution, chemistry, measurement) sample age depth (238U) (232Th) (230Th)xs,0 (231Pa)xs,0 (231Pa/230Th)xs,0 name (ka BP) (cm) (dpm/g) (dpm/g) (dpm/g) (dpm/g) ODP012 4.35 11.8 0.27 0.03 11.11 1.29 0.116 ODP032 8.25 31.8 0.19 0.03 8.95 1.06 0.119 ODP042 10.52 42.2 0.19 0.05 9.25 1.08 0.116 ODP052 12.53 51.8 0.17 0.06 9.96 1.10 0.110 ODP062 14.56 61.7 0.13 0.05 10.52 1.02 0.097 ODP072 17.07 73.7 0.12 0.07 9.91 0.91 0.092 ODP082 18.95 82.3 0.12 0.08 11.10 0.99 0.089 ODP102 23.57 102.1 0.12 0.06 9.00 0.86 0.095 ODP112 26.04 112.1 0.11 0.05 8.50 0.71 0.084 ODP122 28.63 121.8 0.15 0.04 7.91 0.79 0.100 ODP142 34.36 141.6 0.12 0.05 8.31 0.89 0.107 ODP162-a 41.07 162.1 0.12 0.05 9.07 0.92 0.101 ODP162-b 41.07 162.1 0.12 0.03 9.05 0.89 0.098 ODP162-c 41.07 162.1 0.12 0.03 8.93 0.91 0.102 ODP182 48.57 182.1 0.12 0.05 7.55 0.84 0.111 ODP202 55.79 201.7 0.16 0.10 14.53 1.28 0.088 ODP222 63.19 222.3 0.18 0.14 21.72 1.86 0.086 ODP232 66.37 231.9 0.14 0.12 20.07 1.84 0.092 ODP252 72.59 251.9 0.12 0.06 13.40 1.45 0.108 ODP272 78.87 272.4 0.16 0.09 18.75 1.72 0.092 ODP292 85.36 291.8 0.13 0.10 20.39 1.99 0.098 Table 2: Major element concentrations and estimates of percent opal, carbonate, terrigenous and MnO2 obtained by normative calculations. -1, -2: replicate measurements, -ave: average value for the replicate measurements sample age depth Al Ca Fe Mn Si Ti opal carbonate terrigenous MnO2 name (ka BP) (cm) (wt%) (wt%) (wt%) (wt%) (wt%) (wt%) % % % % OPD032 8.25 31.8 0.32 28.8 0.29 0.34 6.9 bdl 13.5 - 14.2 71.5-71.9 3.2 - 3.9 0.53 ODP072-1 17.07 73.7 0.24 31.2 0.20 0.12 3.7 bdl 6.7 - 7.2 77.5-77.9 2.4 - 3.0 0.19 ODP072-2 17.07 73.7 0.26 31.0 0.20 0.13 3.8 bdl 6.7 - 7.3 77.1-77.5 2.6 - 3.2 0.2 ODP072-ave 17.07 73.7 0.25 31.1 0.20 0.13 3.8 bdl 6.7 - 7.2 77.3-77.7 2.5 - 3.1 0.19 ODP082 18.95 82.3 0.20 30.7 0.19 0.18 3.3 bdl 6.1 - 6.5 76.3-76.6 2.0 - 2.5 0.27 ODP102 23.57 102.1 0.16 31.2 0.18 0.13 3.8 bdl 7.6 - 7.9 77.7-77.9 1.6 - 1.9 0.2 ODP122-1 28.63 121.8 0.15 26.5 0.15 0.10 4.3 bdl 8.9 - 9.3 66.0-66.2 1.5 - 1.9 0.15 ODP122-2 28.63 121.8 0.11 31.4 0.16 0.10 4.3 bdl 9.2 - 9.4 78.3-78.4 1.1 - 1.4 0.16 ODP122-ave 28.63 121.8 0.13 29.0 0.16 0.10 4.3 bdl 9.1 - 9.4 72.2-72.3 1.3 - 1.6 0.15 ODP182 48.57 182.1 0.14 31.2 0.19 0.16 6.1 bdl 13.4 - 13.7 77.6-77.8 1.4 - 1.8 0.25 ODP202 55.79 201.7 0.40 25.8 0.36 0.84 9.1 bdl 18.2 - 19.1 63.9-64.4 4.0 - 5.0 1.32 ODP222 63.19 222.3 0.66 25.3 0.51 0.29 9.5 bdl 16.9 - 18.3 62.2-63.1 6.6 - 8.2 0.44 ODP232 66.37 231.9 0.45 24.3 0.38 0.15 8.4 bdl 16.0 - 16.9 59.9-60.5 4.5 - 5.6 0.23 ODP272 78.87 272.4 0.51 23.2 0.38 0.42 10.3 bdl 20.2 - 21.3 57.0-57.7 5.1 - 6.3 0.65