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Hu, X; Wang, Yan-Long; Schmitt, Roman A (1988): Chemical composition of sediments at DSDP Site 72-516 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.707379, Supplement to: Hu, X et al. (1988): Geochemistry of sediments on the Rio Grande Rise and the redox evolution of the South Atlantic Ocean. Geochimica et Cosmochimica Acta, 52(1), 201-207, https://doi.org/10.1016/0016-7037(88)90068-3

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Abstract:
Sediment samples (32) from DSDP Holes 516 and 516F, Leg 72 were subjected to INAA (instrumental neutron activation analysis). Thirty-two major, minor and trace elements were determined. Ce anomalies, Ce_a = Ce (obs.)/Ce* (interpolated between La and Nd and relative to the NASC (North American Shale Composite)) = Ce (obs.)/[1.44 La (obs.) + 0.66 Nd (obs.)], in the carbonate phase were obtained. Calculations indicate that the Ce anomaly changed from 0.80 (80 My), 0.68 (67 My) to 0.30 (56 My), 0.27 (39 My) and 0.12–0.43 (avg. 0.26) (15?0.3 My). The Ce anomaly change observed at ~55 My coincides with the Ce anomaly change at ~58 My in marine carbonates from the Walvis Ridge, Hole 525A. These changes are attributed to improved water circulation caused by either the widening of the north-south Atlantic passage, subsidence of the Rio Grande Rise or subsidence of the Romanche Fracture Zone. The ultimate driving force behind the Ce anomaly changes is related to the pH and pO2 of the seawater and also related to global circulation of bottom ocean water and transport of the external terrestrial input from riverine or/and aeolian sources.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -30.276400 * Median Longitude: -35.285100 * South-bound Latitude: -30.276500 * West-bound Longitude: -35.285200 * North-bound Latitude: -30.276300 * East-bound Longitude: -35.285000
Date/Time Start: 1980-03-11T00:00:00 * Date/Time End: 1980-03-11T00:00:00
Event(s):
72-516 * Latitude: -30.276300 * Longitude: -35.285200 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 183.3 m * Recovery: 148.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 166.1 m cored; 17.2 m drilled; 89.2 % recovery
72-516F * Latitude: -30.276500 * Longitude: -35.285000 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 1270.6 m * Recovery: 690.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1092.5 m cored; 9 m drilled; 63.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Hu, X; Wang, Y-L; Schmitt, RA (1988): (Appendix, Table 1) Element concentrations in sediment samples from DSDP Hole 72-516. https://doi.org/10.1594/PANGAEA.707378
  2. Hu, X; Wang, Y-L; Schmitt, RA (1988): (Appendix, Table 1) Element concentrations in sediment samples from DSDP Hole 72-516F. https://doi.org/10.1594/PANGAEA.707377
  3. Hu, X; Wang, Y-L; Schmitt, RA (1988): (Table 2) Al203 of tephra and clay fractions in noncarbonate matter of sediments at DSDP Site 72-516. https://doi.org/10.1594/PANGAEA.707374