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Wise, Sherwood W; Schlich, Roland; et al. (1992): Calcium carbonate concentrations in Miocene and Pliocene sediments of ODP Hole 120-751A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.757589, Supplement to: Peirce, John W; Weissel, Jeffrey K; et al. (1989): Proceedings of the Ocean Drilling Program, 120 Initial Reports. Proceedings of the Ocean Drilling Program, Ocean Drilling Program, 120, 648 pp, https://doi.org/10.2973/odp.proc.ir.120.1989

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Abstract:
Detailed records of % calcium carbonate and calcium carbonate mass accumulation rate (MAR) for Site 751, located on the Southern Kerguelen Plateau, are presented. The shallow-water site contains a Neogene section with well-preserved carbonate sediments. These sediments record variations in the oceanography of the Antarctic surface waters. Carbonate sedimentation patterns reflect changing modes of biogenic sedimentation in the Miocene and Pliocene Antarctic Ocean.
Drilling at Site 751 recovered 166 m of early Miocene to Pleistocene siliceous and calcareous biogenic oozes. Three hiatuses, however, were detected: one between 14.8 and 12 Ma, another between 8.9 and 6.7 Ma, and a third between 5.08 and 5.36 Ma. Sedimentation rates were about 20 m/m.y. throughout the Miocene and <10 m/m.y. during the Pliocene and Pleistocene.
Key events in the depositional history are as follows: (1) a dramatic decrease in carbonate content, from 75% to near 0%, near the Miocene/Pliocene boundary; and (2) minima in % carbonate occur at 16.7, 16.3, 12.2, 11.7, and 9.8 Ma. The % carbonate record shows variability about a mean of ~70% and then a sharp drop near the Miocene/Pliocene boundary. The carbonate MAR record, however, exhibits a series of steplike changes throughout the Miocene. The terminal Miocene event in the carbonate MAR record is not as dramatic as in the % carbonate record, as carbonate MARs had already decreased to about 15% of their middle Miocene values.
Related to:
Howard, William R (1992): Data Report: Carbonate sedimentation durimng the Miocene and Pliocene on the southern Kerguelen Plateau (Site 751). In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 1073-1077, https://doi.org/10.2973/odp.proc.sr.120.206.1992
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -57.726000 * Longitude: 79.814800
Date/Time Start: 1988-04-18T20:00:00 * Date/Time End: 1988-04-19T23:30:00
Event(s):
120-751A * Latitude: -57.726000 * Longitude: 79.814800 * Date/Time Start: 1988-04-18T20:00:00 * Date/Time End: 1988-04-19T23:30:00 * Elevation: -1644.0 m * Penetration: 166.2 m * Recovery: 162.92 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg120 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 166.2 m cored; 0 m drilled; 98 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets

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Datasets listed in this publication series

  1. Wise, SW; Schlich, R; et al. (1992): (Table 1) Age datums of ODP Hole 120-751A. https://doi.org/10.1594/PANGAEA.757587
  2. Wise, SW; Schlich, R; et al. (1992): (Table 2) Carbonate content of ODP Hole 120-751A. https://doi.org/10.1594/PANGAEA.757588