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Varentsov, Igor M; Sakharov, B A; Drits, Victor A; Tsipursky, S I; Choporov, Dmitry Ya; Aleksandrova, V A (1983): Chemical composition of upper Cenozoic at DSDP Leg 70 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.815445, Supplement to: Varentsov, IM et al. (1983): Hydrothermal deposits of the Galapagos Rift zone, Leg 70: mineralogy and geochemistry of major components. In: Honnorez, J; Von Herzen, RP; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 70, 235-268, https://doi.org/10.2973/dsdp.proc.70.111.1983

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Abstract:
The hydrothermal deposits that we analyzed from Leg 70 are composed of ferruginous green clays and fragments of manganese-hydroxide crust.
Data from X-ray diffraction, IR-spectroscopy, electron diffraction, and chemical analyses indicate that the hydrothermal green clays are composed of disordered mixed-layer phases of celadonite-nontronite.
Electron diffraction shows that the parameters of the unit cells and the degree of three-dimensional ordering of mixed-layer phases with 80% celadonite interlayers are very close to Fe-micas of polymorphic modification IM-celadonite. In some sections, there is a tendency for the number of celadonite layers to increase with depth.
The manganese-hydroxide crust fragments are predominantly composed of todorokite (buserite).
An essential feature of hydrothermal accumulation is the sharp separation of Fe and Mn. Ba/Ti and Ba/Sr ratios are typical indicators of hydrothermal deposits. Sediments composing the hydrothermal mounds were deposited from moderately heated waters, which had extracted the components from solid basalts in environments where there were considerable gradients of temperature, eH, and pH. The main masses of Fe and Mn were deposited in the late Pleistocene. Postsedimentary alteration of deposited hydrothermal sediments led to their slight recrystallization and, in the green clays, to celadonitization.
Further, factor analysis (by Varentsov) of chemical components from these hydrothermal deposits revealed paragenetic assemblages. Green clays corresponding to a definite factor assemblage were formed during the main stage of hydrothermal mineral formation. Manganese hydroxide and associated components were largely accumulated during an early stage and at the end of the main stage.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 0.585500 * Median Longitude: -86.107213 * South-bound Latitude: 0.566700 * West-bound Longitude: -86.132200 * North-bound Latitude: 0.609800 * East-bound Longitude: -86.090000
Date/Time Start: 1979-11-15T00:00:00 * Date/Time End: 1979-11-27T00:00:00
Event(s):
70-506 * Latitude: 0.609800 * Longitude: -86.099800 * Date/Time: 1979-11-15T00:00:00 * Elevation: -2710.0 m * Penetration: 36.7 m * Recovery: 22.7 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 27.9 m cored; 8.8 m drilled; 81.5 % recovery
70-506C * Latitude: 0.607700 * Longitude: -86.091300 * Date/Time: 1979-11-15T00:00:00 * Elevation: -2710.0 m * Penetration: 31.3 m * Recovery: 29.7 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 31.3 m cored; 0 m drilled; 95 % recovery
70-507D * Latitude: 0.566700 * Longitude: -86.090000 * Date/Time: 1979-11-20T00:00:00 * Elevation: -2689.0 m * Penetration: 38.7 m * Recovery: 36.5 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 38.7 m cored; 0 m drilled; 94.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 8) Chemical composition of upper Cenozoic sediments at DSDP Hole 70-506. https://doi.org/10.1594/PANGAEA.815443
  2. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 9) Chemical composition of upper Cenozoic sediments at DSDP Hole 70-506C. https://doi.org/10.1594/PANGAEA.815444
  3. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 5) Chemical composition of upper Cenozoic sediments at DSDP Hole 70-507D. https://doi.org/10.1594/PANGAEA.815440
  4. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 6) Chemical composition of upper Cenozoic sediments at DSDP Hole 70-507F. https://doi.org/10.1594/PANGAEA.815441
  5. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 7) Chemical composition of upper Cenozoic sediments at DSDP Hole 70-507H. https://doi.org/10.1594/PANGAEA.815442
  6. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 4) Crystallochemical study of hydrothermal green clay at DSDP Hole 70-509B. https://doi.org/10.1594/PANGAEA.815439
  7. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 2) Chemical composition of upper Cenozoic sediments at DSDP Hole 70-509B. https://doi.org/10.1594/PANGAEA.815437
  8. Varentsov, IM; Sakharov, BA; Drits, VA et al. (1983): (Table 3) Parameters of unit cells of samples of monomineral components of green hydrothermal clays at DSDP Hole 70-509B. https://doi.org/10.1594/PANGAEA.815438