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Smith, C H; O'Connell, Suzanne B (1990): Grain shape of sediment from the Weddell Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.753898, Supplement to: Smith, CH; O'Connell, SB (1990): Provenance and glacial history of very fine quartz sand from the Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 89-109, https://doi.org/10.2973/odp.proc.sr.113.149.1990

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Abstract:
Very fine quartz sand was examined from Paleogene and Neogene sediments of ODP Sites 693, 694, 695, 696, and 697 to determine their grain roundness using Fourier analysis and SEM surface texture characteristics. The objective of this study was to identify grain roundness and surface texture characteristics unique to East (Site 693) and West (Sites 695, 696, and 697) Antarctica and to glacial regimes. Once identified, these distinguishing features could then be used to determine changes in source area and glacial conditions in the central Weddell Sea Basin (Site 694).
Three end members of very fine quartz sand are recognized in the Oligocene to Pleistocene sediments of the Weddell Sea: angular, rounded, and intermediate. End member 1 (angular) consists of extremely angular grains with numerous fracture textures. Previous investigations suggested that these sands are derived from crystalline rocks that fractured during formation or deformation and/or were exposed to weathering by ice. In this study, however, the correlation of angularity with ice activity is problematical as the most angular sands were recovered in the lower Oligocene sediments of the South Orkney Microcontinent, a period of temperate climatic conditions. End member 3 (rounded) consists of rounded grains with chemically and mechanically produced surface textures. These sands are presumed to be derived from the Beacon-type rocks in East Antarctica and the sedimentary deposits of the Northern Antarctic Peninsula. End member 2 (intermediate) grains display crystalline nodes and grain embayments. They are thought to be derived from felsic intrusives, East Antarctic quartzites, basement metamorphics of the South Orkney Microcontinent, and/or the Andean intrusive series of West Antarctica.
Unfortunately, no features unique to either the East or West Antarctic sediment sources or to glacial conditions could be isolated. Therefore, the objective of determining provenance changes and sediment erosion and transport mechanisms could not be achieved using this approach.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -64.986867 * Median Longitude: -34.036449 * South-bound Latitude: -70.832000 * West-bound Longitude: -43.451600 * North-bound Latitude: -61.810000 * East-bound Longitude: -14.573500
Date/Time Start: 1987-01-30T09:00:00 * Date/Time End: 1987-03-07T13:30:00
Event(s):
113-693A * Latitude: -70.832000 * Longitude: -14.573500 * Date/Time Start: 1987-01-30T09:00:00 * Date/Time End: 1987-02-05T03:15:00 * Elevation: -2371.0 m * Penetration: 483.9 m * Recovery: 213.58 m * Location: Weddell Sea * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 51 core; 483.9 m cored; 0 m drilled; 44.1 % recovery
113-693B * Latitude: -70.832000 * Longitude: -14.574400 * Date/Time Start: 1987-02-05T03:15:00 * Date/Time End: 1987-02-07T21:00:00 * Elevation: -2371.0 m * Penetration: 401.2 m * Recovery: 92.16 m * Location: Weddell Sea * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 167.4 m cored; 0 m drilled; 55.1 % recovery
113-694B * Latitude: -66.847000 * Longitude: -33.447100 * Date/Time Start: 1987-02-10T16:30:00 * Date/Time End: 1987-02-14T13:37:00 * Elevation: -4664.0 m * Penetration: 188.6 m * Recovery: 64.93 m * Location: Weddell Sea * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 184.7 m cored; 0 m drilled; 35.2 % 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. Smith, CH; O'Connell, SB (1990): (Appendix-Table 1) Grain shape of sediments of ODP Site 113-693. https://doi.org/10.1594/PANGAEA.753882
  2. Smith, CH; O'Connell, SB (1990): (Appendix-Table 2) Grain shape of sediments of ODP Site 113-694. https://doi.org/10.1594/PANGAEA.753884
  3. Smith, CH; O'Connell, SB (1990): (Appendix-Table 3) Grain shape of sediments of ODP Site 113-695. https://doi.org/10.1594/PANGAEA.753885
  4. Smith, CH; O'Connell, SB (1990): (Appendix-Table 4) Grain shape of sediments of ODP Site 113-696. https://doi.org/10.1594/PANGAEA.753886
  5. Smith, CH; O'Connell, SB (1990): (Appendix-Table 5) Grain shape of sediments of ODP Hole 113-697B. https://doi.org/10.1594/PANGAEA.753887
  6. Smith, CH; O'Connell, SB (1990): (Table 2) Correlation of harmonic 19 mean amplitude values to Krumbein roundness values for endmember saples, OD Leg 113. https://doi.org/10.1594/PANGAEA.753880