1,721,517 research outputs found
(Table T3) Geochemistry of modern surface sediments in the eastern tropical Pacific with Bio-Ba/Corg ratios
No full textBiogenic barium flux in the eastern equatorial Pacific Ocean
No full textWe present the first regional-scale records of biogenic Barium (xsBa) fluxes in the Panama basin of the eastern-equatorial margin of the Pacific Ocean in order to assess xsBa as a paleoproductivity proxy. Measurements of xsBa from thirteen cores that range in water depths from about 700 ¬¬to 3000 m show an increase in 230Th normalized xsBa mass accumulation rates (MARs) with increasing water depth during both Marine Oxygen Isotope Stages (MIS) 1 and 2. The correlation of xsBa MARs with depth are strong despite differences in bulk sediment mass accumulation rates and differing degrees of sediment redistribution. We interpret the increasing xsBa with water depth as likely due to the continued decomposition and remineralization of falling and/or resuspended biogenic particles. xsBa does not seem to be affected by diagenetic sulfate reduction in most of the cores. Calculated estimates of xsBa preservation in the sediment pile are high and fluctuate between 45% - 52% throughout the last 25 kyr. Although xsBa fluxes can be a robust indicator of paleoproductivity, caution is needed if a) there is evidence of sulfate reduction in sediments being analyzed, and b) one is trying to quantify differences in paleoproductivity among sites that are located at different depths in the water column
Attenuated gamma ray of ODP Site 138-847
No full textHere we present an updated age model for ODP Site 138-847. This dataset uses GRA to align ODP 847 to the ODP 849 CCSF depth scale and age model presented by Lyle et al. (2019, doi:10.5194/cp-15-1715-2019
Splice intervals of ODP Site 138-847
No full textHere we present an updated age model for ODP Site 138-847. This work builds on the work of Lyle et al. (2019, doi:10.5194/cp-15-1715-2019). This dataset is the splice table for ODP Site 847 B, C and D
Offset of ODP Site 138-847
No full textAbstract: Here we present an updated age model for ODP Site 138-847. This work builds on the work of Lyle et al. (2019, doi:10.5194/cp-15-1715-2019). This dataset is the offset table for ODP Site 847 A, B, C and D
New age model with Mg/Ca T. sacculifer values of ODP Site 138-847
No full textHere we present an updated age model for ODP Site 138-847. This work builds on the work of Lyle et al. (2019, doi:10.5194/cp-15-1715-2019). This Mg/Ca dataset was originally published by Wara et al., 2005
Data to reconstruct biogenic sedimentary component time series from the Miocene Pacific to study the biological pump
No full textWe measured over 1,600 samples for POC and CaCO3, from 5 Sites of the Deep-Sea Drilling Project, Ocean Drilling Program, and Integrated Ocean Drilling Program (Sites 574, 884, 1208, U1337, and U1338) from the equatorial Pacific and North Pacific. Freeze-dried sediment samples were analyzed using coulometry and furnace methodologies presented in Lyle et al., (2000) which provide accurate POC values at very low levels. These data were analyzed from 2008 to 2012. We include XRF data for Sites 574, and interpreted XRF data for Sites U1337 and U1338. We have also included data reported for Sites 806 and 807 (Stax and Stein, 1993) from the western equatorial Pacific. We made a continuous sediment splice for Site 574 and created new age models for all drill sites to calculate mass accumulation rates to ~20 million years ago or to the base of the Neogene sediments at each drill site. Age models are also presented in the data sets
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