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Barrett, T J; Taylor, Paul N; Lugowski, J (1987): Chemical and isotope compositions of main phases of metalliferous sediments from holes of DSDP Leg 92 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.707359, Supplement to: Barrett, TJ et al. (1987): Metalliferous sediments from DSDP Leg 92: The East Pacific Rise transect. Geochimica et Cosmochimica Acta, 51(9), 2241-2253, https://doi.org/10.1016/0016-7037(87)90278-X

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Abstract:
The carbonate-free metalliferous fraction of thirty-nine sediment samples from four DSDP Leg 92 sites has been analyzed for 12 elements, and a subset of 16 samples analyzed for Pb isotopic composition. The main geochemical features of this component are as follows: i) very high concentrations of Fe and Mn, typically 25-39% and 5-14%, respectively; ii) Al and Ca contents generally less than 2% and 5%, respectively; iii) high Cu (1000-2000 ppm), and Zn and Ni (500-1000 ppm) values; and iv) Co and Pb concentrations of 100-250 ppm. In terms of element partitioning within the metalliferous fraction, amorphous to poorly crystallized oxide-oxyhydroxides removed by the second leach carry virtually all of the Mn, and about 90% of the Ca, Sr and Ni. The well-crystallized goethite-rich material removed by the third leach carries the majority of Fe, Cu, and Pb. These relations hold for sediments as young as ~1-2 Ma, indicating early partitioning of hydrothermal Fe and Mn into separate phases.
Calculated mass accumulation rates (MAR) for Fe, Mn, Cu, Pb, Zn and Ni in the bulk sediment show the same overall trends at three of the sites, with greatest MAR values near the basement, and a general decrease in MAR values towards the tops of the holes (for sediments deposited above the lysocline). These relations strongly support the concept of a declining hydrothermal contribution of these elements away from a ridge axis. Nevertheless, MAR values for these metals up to ~200 km from the ridge axis are orders of magnitude higher than on abyssal seafloor plains where there is no hydrothermal influence. Mn/Fe ratios throughout the sediment column at two sites indicate that the composition of the hydrothermal precipitates changed during transport through seawater, becoming significantly depleted in Mn beyond ~200-300 km from the axis, but maintaining roughly the same proportion of Fe.
Most of the Pb isotope data for the Leg 92 metalliferous sediments form approximately linear arrays in the conventional isotopic plots, extending from the middle of the field for mid-ocean ridge basalts toward the field for Mn nodules. The array of data lying between these two end-members is most readily interpreted in terms of simple linear mixing of Pb derived from basaltic and seawater end-member sources. The least radiogenic sediments reflect the average Pb isotope composition of discharging hydrothermal solutions and ocean-ridge basalt at the EPR over the ~4-8 Ma B.P. interval. Pb in sediments deposited up to 250 km from the axis can be almost entirely of basaltic-hydrothermal origin. Lateral transport of some basaltic Pb by ocean currents appears to extend to distances of at least 1000 km west of the East Pacific Rise.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -19.065483 * Median Longitude: -121.643197 * South-bound Latitude: -19.451500 * West-bound Longitude: -129.770500 * North-bound Latitude: -18.806300 * East-bound Longitude: -116.840800
Date/Time Start: 1983-03-02T00:00:00 * Date/Time End: 1983-03-26T00:00:00
Event(s):
92-597 * Latitude: -18.806300 * Longitude: -129.770500 * Date/Time: 1983-03-02T00:00:00 * Elevation: -4166.0 m * Penetration: 54.7 m * Recovery: 41.8 m * Location: South Pacific * Campaign: Leg92 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 45.1 m cored; 9.6 m drilled; 92.7 % recovery
92-597A * Latitude: -18.807200 * Longitude: -129.770300 * Date/Time: 1983-03-02T00:00:00 * Elevation: -4163.0 m * Penetration: 48.6 m * Recovery: 48.7 m * Location: South Pacific * Campaign: Leg92 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 49.6 m cored; 0 m drilled; 98.2 % recovery
92-598 * Latitude: -19.004700 * Longitude: -124.676800 * Date/Time: 1983-03-17T00:00:00 * Elevation: -3699.0 m * Penetration: 52.4 m * Recovery: 41.2 m * Location: South Pacific * Campaign: Leg92 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 52.4 m cored; 0 m drilled; 78.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
19 datasets

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Datasets listed in this publication series

  1. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 1) Element concentrations in the carbonate fraction of DSDP Hole 92-597A sediments. https://doi.org/10.1594/PANGAEA.707323
  2. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 1) Element concentrations in the carbonate fraction of DSDP Hole 92-598 sediments. https://doi.org/10.1594/PANGAEA.707324
  3. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 1) Element concentrations in the carbonate fraction of DSDP Hole 92-599 sediments. https://doi.org/10.1594/PANGAEA.707325
  4. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 1) Element concentrations in the carbonate fraction of DSDP Hole 92-601 sediments. https://doi.org/10.1594/PANGAEA.707326
  5. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-597A sediments. https://doi.org/10.1594/PANGAEA.707328
  6. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-598 sediments. https://doi.org/10.1594/PANGAEA.707329
  7. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-599 sediments. https://doi.org/10.1594/PANGAEA.707330
  8. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-599B sediments. https://doi.org/10.1594/PANGAEA.707331
  9. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-600C sediments. https://doi.org/10.1594/PANGAEA.707332
  10. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-601 sediments. https://doi.org/10.1594/PANGAEA.707333
  11. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A) Composition of metalliferous component of DSDP Hole 92-602A sediments. https://doi.org/10.1594/PANGAEA.707334
  12. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A') Accumulation rates of Fe and Mn in sediments from DSDP Hole 92-597A. https://doi.org/10.1594/PANGAEA.707337
  13. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A') Accumulation rates of Fe and Mn in sediments from DSDP Hole 92-598. https://doi.org/10.1594/PANGAEA.707338
  14. Barrett, TJ; Lugowski, J (1987): (Table 2A') Accumulation rates of Fe and Mn in sediments from DSDP Hole 92-599. https://doi.org/10.1594/PANGAEA.707339
  15. Taylor, PN; Lugowski, J (1987): (Table 2A') Accumulation rates of Fe and Mn in sediments from DSDP Hole 92-599B. https://doi.org/10.1594/PANGAEA.707340
  16. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A') Accumulation rates of Fe and Mn in sediments from DSDP Hole 92-600C. https://doi.org/10.1594/PANGAEA.707341
  17. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 2A') Accumulation rates of Fe and Mn in sediments from DSDP Hole 92-601. https://doi.org/10.1594/PANGAEA.707342
  18. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 3A) Proportions of main phases/fractions of 18 metalliferous sediment samples from DSDP Leg 92. https://doi.org/10.1594/PANGAEA.707351
  19. Barrett, TJ; Taylor, PN; Lugowski, J (1987): (Table 4) Pb isotopic composition of DSDP Leg 92 sediments. https://doi.org/10.1594/PANGAEA.707356