Stepwise consolidation of glacigenic sediments of the Prydz Bay ...

• Main Authors: Solheim, Anders, Forsberg, Carl Fredrik, Pittenger, Alan
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1991
• Subjects: Composite Core; Drilling/drill rig; Leg119; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctica; East Antarctica; Ice Sheet; Prydz Bay; West Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.757988; https://doi.pangaea.de/10.1594/PANGAEA.757988

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 ... : Supplement to: Solheim, Anders; Forsberg, Carl Fredrik; Pittenger, Alan (1991): Stepwise consolidation of glacigenic sediments related to the glacial history of Prydz Bay, 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, 169-182 ...