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Lalou, Claude; Brichet, Evelyne; Leclaire, Héloïse; Duplessy, Jean-Claude (1983): Radiochemistry at DSDP Leg 54 and 70 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.816015, Supplement to: Lalou, C et al. (1983): Uranium series disequilibrium and isotope stratigraphy in hydrothermal mound samples from DSDP Sites 506–509, Leg 70 and Site 424, Leg 54: An attempt at chronology. In: Honnorez, J; Von Herzen, RP; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 70, 303-314, https://doi.org/10.2973/dsdp.proc.70.115.1983

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Abstract:
Use of the hydraulic piston corer during DSDP Leg 70 in the Galapagos mounds area allowed recovery of an undisturbed sedimentary sequence down to the basement. It thus became possible to establish the chronology of different events.
Several holes on and off the mounds were studied, using uranium series disequilibrium methods of age determination and oxygen isotope stratigraphy. The following sequence was thereby established:
1) From 600,000 to 300,000 years ago there was normal pelagic sedimentation, with an injection of uranium-rich solution, probably of hydrothermal origin, between 400,000 and 300,000 years ago.
2) From 300,000 to 90,000 years ago, nontronitic clay formed, replacing a pre-existing sediment.
3) From 60,000 to 20,000 years ago, manganese oxide deposits formed, probably also replacing pre-existing sediments.
4) About 19,000 years ago there occurred a uranium injection from seawater, attributed to the end of the hydrothermal circulation.
In some holes, especially Hole 424, Leg 54, younger manganese oxides have been found, indicating that some mounds may be presently active.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 0.597578 * Median Longitude: -86.117826 * South-bound Latitude: 0.588800 * West-bound Longitude: -86.132200 * North-bound Latitude: 0.607700 * East-bound Longitude: -86.091300
Date/Time Start: 1977-05-23T00:00:00 * Date/Time End: 1979-11-27T00:00:00
Event(s):
54-424 * Latitude: 0.593800 * Longitude: -86.130300 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2685.0 m * Penetration: 76 m * Recovery: 36.4 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 66.5 m cored; 9.5 m drilled; 54.8 % recovery
54-424A * Latitude: 0.588800 * Longitude: -86.130200 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2708.0 m * Penetration: 34 m * Recovery: 13.8 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 34 m cored; 0 m drilled; 40.5 % recovery
54-424B * Latitude: 0.597000 * Longitude: -86.130300 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2705.0 m * Penetration: 46.5 m * Recovery: 30.3 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 46.5 m cored; 0 m drilled; 65.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Lalou, C; Brichet, E; Leclaire, H et al. (1983): (Table 3) Radiochemistry of Mn deposits at DSDP Hole 54-424. https://doi.org/10.1594/PANGAEA.816011
  2. Lalou, C; Brichet, E; Leclaire, H et al. (1983): (Table 6) Radiochemistry in the basal sediments at DSDP Site 54-424. https://doi.org/10.1594/PANGAEA.816014
  3. Lalou, C; Brichet, E; Leclaire, H et al. (1983): (Table 1) Radiochemistry in the upper sediments at DSDP Holes 54-424B and 70-506C. https://doi.org/10.1594/PANGAEA.816009
  4. Lalou, C; Brichet, E; Leclaire, H et al. (1983): (Table 5) Radiochemistry in the basal sediment at DSDP Hole 70-506C. https://doi.org/10.1594/PANGAEA.816013
  5. Lalou, C; Brichet, E; Leclaire, H et al. (1983): (Table 2) Radiochemistry in the upper sediments at DSDP Hole 70-509B. https://doi.org/10.1594/PANGAEA.816010
  6. Lalou, C; Brichet, E; Leclaire, H et al. (2013): (Table 4) Radiochemistry in green nontronitic clay in DSDP Holes 54-424, 54-424B and 70-506C. https://doi.org/10.1594/PANGAEA.816012