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Hambrey, Mike J; Ehrmann, Werner; Larsen, Birger (1991): Geochemistry, clay mineralogy and grain size distribution in various sediment cores drilled during ODP Leg 119 on the Antarctic continental shelf off Prydz Bay. PANGAEA, https://doi.org/10.1594/PANGAEA.588238, Supplement to: Hambrey, MJ et al. (1991): Cenozoic glacial record of the Prydz Bay continental shelf, East Antarctica. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 77-132, https://doi.org/10.2973/odp.proc.sr.119.200.1991

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Abstract:
Drilling was undertaken at five sites (739-743) on ODP Leg 119 on a transect across the continental shelf of Prydz Bay, East Antarctica, to elucidate the long-term glacial history of the area and to examine the importance of the area with respect to the development of the East Antarctic ice sheet as a whole. In addition to providing a record of glaciation spanning 36 m.y. or more, Leg 119 has provided information concerning the development of a continental margin under the prolonged influence of a major ice sheet. This has allowed the development of a sedimentary model that may be applicable not only to other parts of the Antarctic continental margin, but also to northern high-latitude continental shelves.
The cored glacial sedimentary record in Prydz Bay consists of three major sequences, dominated by diamictite:
1. An upper flat-lying sequence that ranges in thickness from a few meters in inner and western Prydz Bay to nearly 250 m in the outer or eastern parts of the bay. The uppermost few meters consist of Holocene diatom ooze and diatomaceous mud with a minor ice-rafted component overlying diamicton and diamictite of late Miocene to Quaternary age. The diamictite is mainly massive, but stratified varieties and minor mudstone and diatomite also occur.
2. An upper prograding sequence cored at Sites 739 and 743, unconformly below the flat-lying sequence. This consists of a relatively steep (4° inclination) prograding wedge with a number of discrete sedimentary packages. At Sites 739 and 743 the sequence is dominated by massive and stratified diamictite, some of which shows evidence of slumping and minor debris flowage.
3. A lower, more gently inclined, prograding sequence lies unconformably below the flat-lying sequence at Site 742 and the upper prograding sequence at Site 739. This extends to the base of both sites, to 316 and 487 mbsf, respectively.
It is dominated by massive, relatively clast-poor diamictite which is kaolinite-rich, light in color, and contains sporadic carbonate-cemented layers. The lower part of Site 742 includes well-stratified diamictites and very poorly sorted mudstones. The base of this site has indications of large-scale soft-sediment deformation and probably represents proximity to the base of the glacial sequence.
Facies analysis of the Prydz Bay glacial sequence indicates a range of depositional environments. Massive diamictite is interpreted largely as waterlain till, deposited close to the grounding line of a floating glacier margin, although basal till and debris flow facies are also present. Weakly stratified diamictite is interpreted as having formed close to or under the floating ice margin and influenced by the input of marine diatomaceous sediment (proximal glaciomarine setting).
Well-stratified diamictite has a stronger marine input, being more diatom-rich, and probably represents a proximal-distal glaciomarine sediment with the glaciogenic component being supplied by icebergs. Other facies include a variety of mudstones and diatom-rich sediments of marine origin, in which an ice-rafted component is still significant. None of the recovered sediments are devoid of a glacial influence.
The overall depositional setting of the prograding sequence is one in which the grounded ice margin is situated close to the shelf edge. Progradation was achieved primarily by deposition of waterlain till. The flat-lying sequence illustrates a complex sequence of advances and retreats across the outer part of the shelf, with intermittent phases of ice loading and erosion.
The glacial chronology is based largely on diatom stratigraphy, which has limited resolution. It appears that ice reached the paleoshelf break by earliest Oligocene, suggesting full-scale development of the East Antarctic ice sheet by that time. The ice sheet probably dominated the continental margin for much of Oligocene to middle Miocene time. Retreat, but not total withdrawal of the ice sheet, took place in late Miocene to mid-Pliocene time. The late Pliocene to Pleistocene was characterized by further advances across, and progradation of, the continental shelf. Holocene time has been characterized by reduced glacial conditions and a limited influence of glacial processes on sedimentation.
Project(s):
Coverage:
Median Latitude: -67.531556 * Median Longitude: 75.368939 * South-bound Latitude: -68.764000 * West-bound Longitude: 74.690500 * North-bound Latitude: -66.916000 * East-bound Longitude: 76.681900
Date/Time Start: 1988-01-18T14:30:00 * Date/Time End: 1988-02-03T20:00:00
Event(s):
119-739A * Latitude: -67.285000 * Longitude: 75.081800 * Date/Time Start: 1988-01-18T14:30:00 * Date/Time End: 1988-01-18T19:30:00 * Elevation: -423.0 m * Penetration: 5.6 m * Recovery: 5.73 m * Location: Prydz Bay * Campaign: Leg119 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 5.6 m cored; 0 m drilled; 102.3 % recovery
119-739B * Latitude: -67.285000 * Longitude: 75.081800 * Date/Time Start: 1988-01-18T19:30:00 * Date/Time End: 1988-01-19T03:00:00 * Elevation: -423.0 m * Penetration: 7.2 m * Recovery: 1.92 m * Location: Prydz Bay * Campaign: Leg119 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 7.2 m cored; 0 m drilled; 26.7 % recovery
119-739C * Latitude: -67.285000 * Longitude: 75.081800 * Date/Time Start: 1988-01-19T03:00:00 * Date/Time End: 1988-01-23T05:30:00 * Elevation: -423.0 m * Penetration: 486.8 m * Recovery: 168.5 m * Location: Prydz Bay * Campaign: Leg119 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 486.8 m cored; 0 m drilled; 34.6 % recovery
Size:
36 datasets

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Datasets listed in this Collection

  1. Ehrmann, W; Hambrey, MJ; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91218
  2. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-739A. https://doi.org/10.1594/PANGAEA.91266
  3. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-739B. https://doi.org/10.1594/PANGAEA.91267
  4. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91268
  5. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-740A. https://doi.org/10.1594/PANGAEA.91269
  6. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-741A. https://doi.org/10.1594/PANGAEA.91270
  7. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91271
  8. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral composition of sediments from ODP Hole 119-743A. https://doi.org/10.1594/PANGAEA.91272
  9. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-739A. https://doi.org/10.1594/PANGAEA.91213
  10. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-739B. https://doi.org/10.1594/PANGAEA.91214
  11. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91215
  12. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-740A. https://doi.org/10.1594/PANGAEA.91216
  13. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-741A. https://doi.org/10.1594/PANGAEA.91217
  14. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Clay mineral raw data of sediments of ODP Hole 119-743A. https://doi.org/10.1594/PANGAEA.91219
  15. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Geochemistry of sediments from ODP Hole 119-739A. https://doi.org/10.1594/PANGAEA.91234
  16. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Geochemistry of sediments from ODP Hole 119-739B. https://doi.org/10.1594/PANGAEA.91233
  17. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Geochemistry of sediments from ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91235
  18. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Geochemistry of sediments from ODP Hole 119-741A. https://doi.org/10.1594/PANGAEA.91236
  19. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Geochemistry of sediments from ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91237
  20. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Geochemistry of sediments from ODP Hole 119-743A. https://doi.org/10.1594/PANGAEA.91238
  21. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain shape of sediments from ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91239
  22. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain shape of sediments from ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91240
  23. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-739A. https://doi.org/10.1594/PANGAEA.91220
  24. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-739B. https://doi.org/10.1594/PANGAEA.91221
  25. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91222
  26. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-740A. https://doi.org/10.1594/PANGAEA.91223
  27. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-741A. https://doi.org/10.1594/PANGAEA.91224
  28. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91225
  29. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size fractions of sediments from ODP Hole 119-743A. https://doi.org/10.1594/PANGAEA.91227
  30. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size parameters of sediments of ODP Hole 119-739A. https://doi.org/10.1594/PANGAEA.91228
  31. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size parameters of sediments of ODP Hole 119-739B. https://doi.org/10.1594/PANGAEA.91229
  32. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size parameters of sediments of ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91230
  33. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size parameters of sediments of ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91231
  34. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Grain size parameters of sediments of ODP Hole 119-743A. https://doi.org/10.1594/PANGAEA.91232
  35. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Gravel as ice rafted debris in sediments from ODP Hole 119-739C. https://doi.org/10.1594/PANGAEA.91241
  36. Hambrey, MJ; Ehrmann, W; Larsen, B (1991): Gravel as ice rafted debris in sediments from ODP Hole 119-742A. https://doi.org/10.1594/PANGAEA.91242