Singh, Ajay Kumar; Marcantonio, Franco; Lyle, Mitchell W (2020): Biogenic barium flux in the eastern equatorial Pacific Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.922600
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Abstract:
We 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.
Keyword(s):
Supplement to:
Singh, Ajay Kumar; Marcantonio, Franco; Lyle, Mitchell W (2020): An Assessment of xsBa Flux as a Paleoproductivity Indicator and its Water‐Depth Dependence in the Easternmost Equatorial Pacific Ocean. Paleoceanography and Paleoclimatology, 35, e2020PA003945, https://doi.org/10.1029/2020PA003945
Coverage:
Median Latitude: 2.775000 * Median Longitude: -85.615000 * South-bound Latitude: -0.420000 * West-bound Longitude: -86.300000 * North-bound Latitude: 6.140000 * East-bound Longitude: -85.200000
Minimum DEPTH, sediment/rock: 0.0025 m * Maximum DEPTH, sediment/rock: 0.2300 m
Event(s):
MV1014-01-1MC * Latitude: 5.490000 * Longitude: -85.440000 * Elevation: -1760.0 m * Campaign: MV1014 * Basis: Melville * Method/Device: MultiCorer (MUC)
MV1014-01-7MC * Latitude: 6.140000 * Longitude: -86.300000 * Elevation: -1995.0 m * Campaign: MV1014 * Basis: Melville * Method/Device: MultiCorer (MUC)
MV1014-02-9MC * Latitude: -0.420000 * Longitude: -85.200000 * Elevation: -2452.0 m * Campaign: MV1014 * Basis: Melville * Method/Device: MultiCorer (MUC)
Comment:
xsBa estimations (xsBa= total xsBa -detrital xsBa) made using Ba/Th versus Ba/Al detrital corrections and their comparison is shown here.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Singh, Ajay Kumar | |||
| 2 | Latitude of event | Latitude | Singh, Ajay Kumar | |||
| 3 | Longitude of event | Longitude | Singh, Ajay Kumar | |||
| 4 | DEPTH, sediment/rock | Depth sed | m | Singh, Ajay Kumar | Geocode | |
| 5 | AGE | Age | ka BP | Singh, Ajay Kumar | Geocode | |
| 6 | Barium | Ba | mg/kg | Singh, Ajay Kumar | ||
| 7 | Aluminium | Al | % | Singh, Ajay Kumar | ||
| 8 | Barium excess | Ba xs | mg/kg | Singh, Ajay Kumar | xsBa(Al) | |
| 9 | Barium excess | Ba xs | mg/kg | Singh, Ajay Kumar | xsBa(Th) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
124 data points