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The Marine Geotechnical Consortium (1985): Geotechnical properties of pelagic clays at DSDP Hole 86-576A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803107, Supplement to: The Marine Geotechnical Consortium (1985): Geotechnical properties of Northwest Pacific pelagic clays: Deep Sea Drilling Project Leg 86, Hole 576A. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 723-758, https://doi.org/10.2973/dsdp.proc.86.134.1985

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Abstract:
Geotechnical property results from Deep Sea Drilling Project Hole 576A sediments represent the most complete data set ever compiled for a continuously depositional, sedimentary section that spans 65 m.y. Geotechnical analyses included index-property and sediment characterization, and consolidation, permeability, and triaxial testing. Excellent agreement exists between test data generated in this multilaboratory effort.
Sediment characterization and index-property data delineate three well-defined units that conform with major lithologic divisions. Within Subunit IA these data appear inconsistent with accepted geotechnical relationships, showing water content, plasticity, and grain size increasing over similar intervals. These unusual relationships are attributed, in part, to silt-sized bonded clay aggregates. Within Subunit IB geotechnical properties become more uniform, and a marked increase in X-ray amorphous material occurs below 28 m sub-bottom. A pronounced change in the geotechnical behavior of Hole 576A sediments occurs in Unit II and corresponds to the presence of calcareous oozes.
Consolidation test results show overconsolidated sediments in the upper 28 m and normally consolidated sediments between 28 and 55 m sub-bottom. Mechanisms to explain the state of overconsolidation that are consistent with the geological history of the area include cementation and interparticle bonding, the release of high hydrostatic pressures during core recovery, and artifacts resulting from the consolidation test process. Additionally, the relevance of the preconsolidation stress determined using consolidation test results may be limited.
Variations in the shear strength gradient with depth are consistent with the consolidation test results. The gradient for the overconsolidated interval (0 and 28 m sub-bottom) is significantly higher than between 28 and 55 m sub-bottom, where the sediments become normally consolidated.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 32.356300 * Longitude: 164.275300
Date/Time Start: 1982-05-16T00:00:00 * Date/Time End: 1982-05-16T00:00:00
Event(s):
86-576A * Latitude: 32.356300 * Longitude: 164.275300 * Date/Time: 1982-05-16T00:00:00 * Elevation: -6217.0 m * Penetration: 65.7 m * Recovery: 66.2 m * Location: North Pacific * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 65.7 m cored; 0 m drilled; 100.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
11 datasets

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Datasets listed in this publication series

  1. The Marine Geotechnical Consortium (1985): (Table 4) Consolidation properties at DSDP Hole 86-576A sediments using incrementally loaded consolidation test. https://doi.org/10.1594/PANGAEA.803098
  2. The Marine Geotechnical Consortium (1985): (Table 5) Consolidation properties at DSDP Hole 86- 576A sediments using constant rate of deformation consolidation tests. https://doi.org/10.1594/PANGAEA.803099
  3. The Marine Geotechnical Consortium (1985): (Table 8) Consolidation properties at DSDP Hole 86- 576A sediments using unconsolidated-undrained (UU) triaxial test. https://doi.org/10.1594/PANGAEA.803101
  4. The Marine Geotechnical Consortium (1985): (Table 9) Consolidation properties at DSDP Hole 86-576A sediments using CIU triaxial test. https://doi.org/10.1594/PANGAEA.803102
  5. The Marine Geotechnical Consortium (1985): (Table 10) Overonsolidation properties at DSDP Hole 86-576A sediments using CIU triaxial test. https://doi.org/10.1594/PANGAEA.803103
  6. The Marine Geotechnical Consortium (1985): (Table 11) Consolidation properties at DSDP Hole 86-576A sediments using CIU triaxial test. https://doi.org/10.1594/PANGAEA.803104
  7. The Marine Geotechnical Consortium (1985): (Table 2) Mineralogy at DSDP Hole 86-576A sediments. https://doi.org/10.1594/PANGAEA.803096
  8. The Marine Geotechnical Consortium (1985): (Table 6) Preconsolidation stress and corresponding overconsolidation ratios at DSDP Hole 86-576A. https://doi.org/10.1594/PANGAEA.803100
  9. The Marine Geotechnical Consortium (1985): (Table 12) Undrained shear strength and effective overburden stress ratio from CIU triaxial tests and adjusted for the in situ KQ condition for DSDP Hole 86-576A sediments. https://doi.org/10.1594/PANGAEA.803105
  10. The Marine Geotechnical Consortium (1985): (Table 13) Undrained shear strength and effective overburden stress ratio for both the normally consolidated condition and after correcting for the state of overconsolidation at DSDP Hole 86-576A. https://doi.org/10.1594/PANGAEA.803106
  11. The Marine Geotechnical Consortium (1985): (Table 3) Sediment characteristics and index-property at DSDP Hole 86-576A. https://doi.org/10.1594/PANGAEA.803097