Geotechnical properties of siliceous sediments from the Voring Plateau, Norwegian Sea and the Kerguelen Plateau, Southern Ocean

Author(s): Pittenger, Hugh Alan
Source: 163p. Institution: Texas A&M University, College Station, TX, United States
Note: In English. Doctoral dissertation
Summary: Cores retrieved from Ocean Drilling Program Legs 104 and 119 reveal that siliceous sediments have relatively high porosities and permeabilities. As expected, undrained shear strengths in siliceous sections are relatively low and largely dependent on the abundance and mineralogy of accessory clays. These characteristics imply that siliceous sediments should be especially prone to slope failures. Determination of plastic limits provides a simple and fairly accurate means of determining biogenic silica content in these sediments. Although siliceous sediments are very compressible in laboratory consolidation tests, they appear to undergo very little in-situ consolidation. As a result, siliceous sediments probably play an important role in the structural development of pelagic-dominated convergent plate margins, characterized by underconsolidated sediments, by maintaining high sediment pore pressures. On the Voring and Kerguelen Plateaus, consolidation state is a function of sedimentation rate and is a useful stratigraphic tool for identifying the presence and nature of unconformities. In conformable sections, siliceous sediments are increasingly underconsolidated with depth. (Auth. mod.)
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 30 Engineering Geology; Antarctic Ocean; Arctic Ocean; Clastic sediments; Clay; Failures; Indian Ocean; Kerguelen Plateau; Leg 104; Leg 119; Norwegian Sea; Ocean Drilling Program; Permeability; Plate boundaries; Plate convergence; Porosity; Properties; Sedimentation rates; Sediments; Shear strength; Silica; Siliceous composition; Slope stability; Soil mechanics; Underconsolidated materials; Voring Plateau
Coordinates: N664042 N674254 E0043436 E0010200
S684114 S492407 E0855147 E0713936
Record ID: 1993022297
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States