Citation:

odp.proc.sr.119.187.1991

Name: Stepwise consolidation of glacigenic sediments of the Prydz Bay
Published: 1991
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

A series of samples from the five sites drilled across the continental shelf and upper slope in Prydz Bay during ODP Leg 119 were consolidation tested in an oedometer. Preconsolidation stresses increase downcore at Sites 739 and 742 in a stepwise manner, and the steps are interpreted to represent periods of increased action of grounded glaciers covering the entire shelf. By the use of theoretical ice sheet surface profiles giving the range of possible ice thicknesses, sediment loading and subsequent erosion seem to be the most important factor for increasing the overconsolidation ratios, and a total glacial erosion exceeding 1 km is possible. Four separate steps in consolidation, here termed "load events" have been identified. The lowermost load event, 1, is correlated to the onset of glaciations reaching the shelf edge and an early period of extensive glaciations, starting in early Oligocene or possibly earlier. Glacial activity related to the buildup of ice in West Antarctica in the late Miocene is tentatively correlated to load event 2. Event 3 is the trace of relatively extensive glacial erosion probably in the Pliocene, whereas the upper step in preconsolidation stress, load event 4, results from the last glaciation reaching the shelf edge, possibly during the late Weichselian. Correlations to other data related to Antarctic glacial history are, however, hampered by the poor age control of the cored diamictites. Consolidation tests may provide a tool for finding the position for hiatuses and unconformities formed subglacially and obscured by subglacial reworking.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: -67.623600 * Median Longitude: 75.462094 * South-bound Latitude: -68.764000 * West-bound Longitude: 74.690500 * North-bound Latitude: -66.916000 * East-bound Longitude: 76.681900

Date/Time Start: 1988-01-18T00:00:00 * Date/Time End: 1988-02-03T20:00:00

Event(s):

119-739 * Latitude: -67.285000 * Longitude: 75.081800 * Date/Time Start: 1988-01-18T00:00:00 * Date/Time End: 1988-01-23T00:00:00 * Elevation: -423.0 m * Penetration: 499.6 m * Recovery: 176.1 m * Location: Prydz Bay * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 67 cores; 499.6 m cored; 0 m drilled; 35.3% 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: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 486.8 m cored; 0 m drilled; 34.6 % recovery

119-740A * Latitude: -68.764000 * Longitude: 76.681900 * Date/Time Start: 1988-01-23T18:30:00 * Date/Time End: 1988-01-27T13:15:00 * Elevation: -818.0 m * Penetration: 225.5 m * Recovery: 72.19 m * Location: Prydz Bay * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 core; 225.5 m cored; 0 m drilled; 32 % 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

Solheim, A; Forsberg, CF; Pittenger, A (1991): (Table 2) Consolidation test results for sediments of the Prydz Bay. https://doi.org/10.1594/PANGAEA.757980
Solheim, A; Forsberg, CF; Pittenger, A (1991): (Table 3) Calculated consolidation times for sedimentary sections of the Prydz Bay samples. https://doi.org/10.1594/PANGAEA.757987