Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data Pichat, S.; Sims, K.W.W.; François, R.; McManus, J.F.; Brown-Leger, S.; Albarède, F. Pichat, S. Sims, K.W.W. François, R. McManus, J.F. Brown-Leger, S. Albarède, F. earth science/paleoclimate/paleoceanography (mineral matter,sediment,null,percent,null,paleoceanography,null,null,N,terrigenous sediment) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (manganese,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (manganese oxide,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (silicon,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (carbonate,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (iron,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (titanium,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 849>LATITUDE .18>LONGITUDE -110.52) 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. STUDY NOTES: 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). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Pichat, S. Investigator : Sims, K.W.W. Investigator : François, R. Investigator : McManus, J.F. Investigator : Brown-Leger, S. Investigator : Albarède, F. 2011-01-07 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10356 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.xls English https://www.ncdc.noaa.gov/paleo/study/10356 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.xls 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. START YEAR: 85360 cal yr BP * END YEAR: 4350 cal yr BP -110.52 .18 -110.52 .18