Ruthberg, Randye L; Goldstein, Steven L; Hemming, Sidney R; Anderson, Robert F (2005): (Table 2) Detrital Sr isotope ratios of sediment core RC11-83 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.837313, Supplement to: Ruthberg, RL et al. (2005): Sr isotope evidence for sources of terrigenous sediment in the southeast Atlantic Ocean: Is there increased available Fe for enhanced glacial productivity? Paleoceanography, 20(1), PA1018, https://doi.org/10.1029/2003PA000999
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Abstract:
Sr isotope ratios of the terrigenous sediments from the Cape Basin (southeast Atlantic Ocean) exhibit a systematic pattern of climate-related variability from the Holocene through the last glacial period. Values are high during warm climate intervals (marine isotope stages (MISs) 1 and 3) and lower during full glacial periods (MISs 2 and 4). The variability is large (87Sr/86Sr = 0.717-0.723), and the rapid changes correspond temporally to abrupt climate change during the MIS 5a/4 and 2/1 transitions and through MIS 3. The Sr isotope variability corresponds to changes in d13C of benthic foraminifera at orbital frequencies and within periods of rapid variability. Prior studies have suggested that benthic d13C records from the Cape Basin follow Greenland ice core variability and thus global overturning circulation. Other studies suggest that these benthic d13C records contain a strong overprint from isotopically light carbon, possibly associated with high fluxes of organic matter to the seabed. We explore the scenario that the relationship between lower terrigenous 87Sr/86Sr and lighter benthic d13C may reflect high productivity during cold climatic intervals as a result of iron fertilization of the southern Atlantic Ocean. Increased supply of iron during cold periods may be associated with greater terrigenous sediment fluxes from South America, characterized by a less-radiogenic Sr isotopic signature.
Further details:
Charles, Christopher D; Lynch-Stieglitz, Jean; Ninnemann, Ulysses S; Fairbanks, Richard G (1996): (Table 1) Age determination of sediment core RC11-83. PANGAEA, https://doi.org/10.1594/PANGAEA.837314
Charles, Christopher D; Lynch-Stieglitz, Jean; Ninnemann, Ulysses S; Fairbanks, Richard G (1996): Climate connections between the hemisphere revealed by deep sea sediment core/ice core correlations. Earth and Planetary Science Letters, 142(1-2), 19-27, https://doi.org/10.1016/0012-821X(96)00083-0
Coverage:
Latitude: -41.600000 * Longitude: 9.717000
Date/Time Start: 1967-02-24T00:00:00 * Date/Time End: 1967-02-24T00:00:00
Minimum DEPTH, sediment/rock: 0.84 m * Maximum DEPTH, sediment/rock: 14.85 m
Event(s):
RC11-83 * Latitude: -41.600000 * Longitude: 9.717000 * Date/Time: 1967-02-24T00:00:00 * Elevation: -4718.0 m * Recovery: 15.28 m * Campaign: RC11 (RC1112) * Basis: Robert Conrad * Method/Device: Piston corer (PC)
Comment:
The average 87Sr/86Sr values and external reproducibility measured for SRM 987 over three intervals during which samples were measured are: 0.71031 ± 3 (2 s external reproducibility, n = 8), 0.71026 ± 4 (2 s external reproducibility, n = 38), 0.71023 ± 3 (2 s external reproducibility, n = 16). These errors are far less than the isotopic difference among samples. Because our samples had a wide range in composition, higher precision data was not required, allowing us to minimize analytical time which greatly contributed to the efficiency of this method. The external error is taken to be the best estimate of the analytical uncertainty. The procedural blank is ~500 pg, which comprises less than 0.05% of sample Sr. The RC11-83 ages are derived from the age model of Charles et al. (1996).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Strontium-87/Strontium-86 ratio | 87Sr/86Sr | Ruthberg, Randye L |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
73 data points