Dekov, Vesselin M; Kuptsov, Vladimir M (1992): Uranium and thorium isotopes and sedimentation rates in metalliferous sediments from the western flank of the East Pacific Rise at 21°-22°S [dataset publication series]. P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, PANGAEA, https://doi.org/10.1594/PANGAEA.759107, Supplement to: Dekov, VM; Kuptsov, VM (1992): Late Quaternary rates of accumulation of metal-bearing sediments on the East Pacific Rise. Oceanology, 32(1), 94-101
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Abstract:
Isotopic compositions of uranium (234U and 238U) and thorium (230Th and 232Th) were measured in metalliferous sediments from the western flank of the East Pacific Rise at 21°-22°S, in the area of hydrothermal activity and massive sulfide accumulation at the axis of the EPR. Concentration of 232Th (on the carbonate-free base) is consistent with composition of mafic extrusive rocks; isotope ratios 232Th/238U and 234U/238U indicate that about 70% of uranium passes into sediments from sea water with hydrothermal iron hydroxide. Mean sedimentation rates are calculated for seven cores by the nonequilibrium 230Th method with use of the constant concentration model. Flux of 230Th to bottom sediments is calculated and its mean value is used to determine sedimentation rate in four other cores. The constant flux model is used to calculate change of sedimentation rate with depth for seven cores over time interval of 100-300 ky. Sedimentation rates varied not much (0.3-0.6 cm/ky). The greatest changes occurred in two cores: one located near massive sulfide structures, and another near the spreading axis. Determinations of mean rates by the radiocarbon method and the nonequilibrium thorium method are in good agreement.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: -21.234076 * Median Longitude: -114.457387 * South-bound Latitude: -22.080000 * West-bound Longitude: -114.723333 * North-bound Latitude: -20.500000 * East-bound Longitude: -114.241700
Event(s):
GF4-85 * Latitude: -21.561667 * Longitude: -114.510000 * Elevation: -3140.0 m * Location: Southeast Pacific * Campaign: GF4 * Basis: Geolog Fersman * Method/Device: Gravity corer (Russian type) (RGC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Dekov, VM; Kuptsov, VM (1992): (Table 1) Concentrations of major and radioactive elements in metalliferous sediments from the western flank of the East Pacific Rise at 21°-22°S. https://doi.org/10.1594/PANGAEA.759103
- Dekov, VM; Kuptsov, VM (1992): (Table 2) Calculated sedimentation rates based on the constant concentration model and the constant flux model, western flank of the East Pacific Rise at 21°-22°S. https://doi.org/10.1594/PANGAEA.759105