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Bohrmann, Gerhard; Ehrmann, Werner (1991): Bulk mineralogy of Cretaceous to Quaternary sediments from the Kerguelen Plateau [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758100, Supplement to: Bohrmann, G; Ehrmann, W (1991): Analysis of Sedimentary Facies Using Bulk Mineralogic Characteristics in Cretaceous to Quaternary Sediments from the Kerguelen Plateau: Sites 737, 738, and 744. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 211-223, https://doi.org/10.2973/odp.proc.sr.119.122.1991

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Abstract:
Carbonate-free portions of Upper Cretaceous to Holocene sediment samples from the Kerguelen Plateau in the southern Indian Ocean were investigated by X-ray diffraction. Downhole variations in the content of opal-A, opal-CT, quartz, feldspar, barite, and clinoptilolite were studied at Site 737 on the northern Kerguelen Plateau and at Sites 744 and 738 on the southern Kerguelen Plateau. The variation of these components reflects temporal changes in the depositional history of the Kerguelen Plateau as well as major differences in the sedimentary evolution between the northern plateau and the southern plateau.
Carbonate is the dominant component in the pelagic sediments on the Kerguelen Plateau. In addition, biogenic opal sedimentation plays an important role throughout most of the sequence. A major increase in opal accumulation is documented at all sites in late Miocene time, which is in accordance with the well-known increase in silica productivity probably caused by a major cooling step. Because of its position near the Polar Frontal Zone, sediments from Site 737 show a more extensive opal deposition than at Sites 744 and 738. An earlier productivity pulse is documented at Site 744 on the southern plateau within the early Oligocene, following the initial phase of intense East Antarctic glaciation. This cooling event resulted in higher amounts of ice-rafted terrigenous quartz and, to a lesser extent, feldspar. With the exception of the Site 744 sediments, opal deposition in Paleogene and older sediments can be reconstructed only from the diagenetic transformation products of opal-CT and probably clinoptilolite. In contrast to the southern sequence, on the northern Kerguelen Plateau higher amounts of clinoptilolite and no opal-CT were found. These major differences in the diagenetic environments may be due to extensive volcanism in the northern area. The volcanic influence at Site 737 is well recorded by the higher feldspar content and higher amounts of volcanic glass shards.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -58.172000 * Median Longitude: 78.805067 * South-bound Latitude: -62.709000 * West-bound Longitude: 73.032400 * North-bound Latitude: -50.228000 * East-bound Longitude: 82.787800
Date/Time Start: 1987-12-30T04:30:00 * Date/Time End: 1988-02-06T19:15:00
Event(s):
119-737A * Latitude: -50.228000 * Longitude: 73.032400 * Date/Time Start: 1987-12-30T04:30:00 * Date/Time End: 1987-12-31T17:15:00 * Elevation: -575.0 m * Penetration: 273.2 m * Recovery: 181.64 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 273.2 m cored; 0 m drilled; 66.5 % recovery
119-737B * Latitude: -50.228000 * Longitude: 73.032400 * Date/Time Start: 1987-12-31T17:15:00 * Date/Time End: 1988-01-04T09:30:00 * Elevation: -575.0 m * Penetration: 715.5 m * Recovery: 298.35 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 481.3 m cored; 0 m drilled; 62 % recovery
119-738B * Latitude: -62.709000 * Longitude: 82.787800 * Date/Time Start: 1988-01-10T16:30:00 * Date/Time End: 1988-01-11T18:45:00 * Elevation: -2263.0 m * Penetration: 214.3 m * Recovery: 170.85 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 214.3 m cored; 0 m drilled; 79.7 % 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. Bohrmann, G; Ehrmann, W (1991): (Appendix Table 1) Sediment composition of ODP Site 119-737. https://doi.org/10.1594/PANGAEA.758097
  2. Bohrmann, G; Ehrmann, W (1991): (Appendix Table 2) Sediment composition of ODP Site 119-738. https://doi.org/10.1594/PANGAEA.758098
  3. Bohrmann, G; Ehrmann, W (1991): (Appendix Table 3) Sediment composition of ODP Hole 119-744A. https://doi.org/10.1594/PANGAEA.758099