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Data report: consolidation characteristics of sediments along a shelf-slope transect from IODP Expedition 317, Canterbury Basin, New Zealand

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Proceedings of the IODP

Integrated Ocean Drilling Program

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      Abstract

      We performed uniaxial consolidation tests on 41 whole-round samples from four sites along a shelf-slope transect (Integrated Ocean Drilling Program [IODP] Sites U1351–U1354) that were collected during Expedition 317. Each sample was loaded in 9–15 loading and unloading steps, with each step taking ~24 h. The preconsolidation stress was estimated using a graphical procedure. However, this method has limitations because it requires that the transition from the reloading curve to the virgin compression curve is well defined on the semilogarithmic plot of void ratio versus vertical effective stress. The sediments are mostly strongly overconsolidated. In the uppermost 25 m, the maximum past effective overburden stress correlates very well among each site. Below this depth, the maximum past effective overburden stress tends to higher values at sites more distal to the slope (Sites U1353 and U1354) than at sites proximal to the slope (Sites U1351 and U1352).

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      Physical Properties Handbook A Guide to the Shipboard Measurement of Physical Properties of Deep-Sea Cores

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        Data report consolidation characteristics of sediments from IODP Expedition 308 Ursa Basin Gulf of Mexico

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          Data report: consolidation, permeability, and fabric of sediments from the Nankai continental slope, IODP Sites C0001, C0008, and C0004: Expeditions 315 and 316

          We conducted constant rate of strain (CRS) consolidation tests on 16 whole-round samples obtained during Integrated Ocean Drilling Program (IODP) Expeditions 315 and 316 as part of Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) Stage 1 drilling. Samples were taken from slope sediments and the underlying accretionary wedge cored at IODP Sites C0001, C0004, and C0008 in the vicinity of a major out-of-sequence thrust fault (termed the megasplay). We conducted tests in parallel at the Rock and Sediment Mechanics Laboratory at The Pennsylvania State University (USA) and the geotechnical laboratory at the University of Missouri (USA), with the objectives of (1) defining the compression behavior and hydraulic properties of the sediments and (2) estimating in situ effective stress and pore pressure conditions from laboratory stress-strain behavior. In addition, we conducted quantitative fabric analyses at the University of Missouri on samples taken immediately adjacent to the CRS test specimens using an environmental scanning electron microscope. The samples exhibit similar consolidation and hydraulic properties. The samples exhibit a general trend of increasing fabric development with depth at Sites C0004 and C0008, with samples from the accretionary prism at Site C0001 and slope sediments in the footwall of the megasplay fault at Site C0004 exhibiting a higher degree of grain alignment. The compression index ranges from 0.419 to 1.058 for the entire suite of samples, with most values ranging from 0.6 to 0.8. Intrinsic permeability decreases systematically with increasing effective axial stress and decreasing porosity and varies log-linearly with porosity. The permeability-porosity trends for specimens from the three sites are similar and exhibit no systematic variation with depth. Estimated values of in situ hydraulic conductivity follow a similar trend at all three sites and decrease with depth from values of 3.3 × 10–10 to 1.0 × 10–9 m/s at ~50 meters below seafloor (mbsf) to 3.3 × 10–11m/s at 440 mbsf. We estimated maximum preconsolidation stress (Pc′) using two separate techniques and consistently obtained values comparable to calculated values of hydrostatic vertical effective stress at Sites C0001 and C0008. Similarity of these values is consistent with normal consolidation and hydrostatic pore fluid pressures. In contrast, Pc′ values for Site C0004 document apparent overconsolidation.
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            Author and article information

            Journal
            10.2204/iodp.proc.317.2011
            Proceedings of the IODP
            Integrated Ocean Drilling Program
            1930-1014
            15 July 2013
            10.2204/iodp.proc.317.203.2013

            This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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