Citation:

odp.proc.sr.112.169.1990

Name: Consolidation, triaxial shear-strength, and index-property characteristics of organic-rich sediments from the Peru margin
Published: 1990
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Sites 679, 680, and 681 of the Ocean Drilling Program were drilled along an east-west transect across an organic-rich, diatomaceous, coastal upwelling facies that occurs as a shelf/slope lens along the Peru continental margin. Seven 60-cm-long, unsplit core sections from these sites were tested for consolidation, triaxial shear strength, and geotechnical index properties. The testing showed that the sediment has unusually high water content, Atterberg limits, degree of overconsolidation, compressibility, and shear strength. The sediment has unusually low density and grain specific gravity. Atterberg limits, grain specific gravity, compressibility, and apparent excess maximum past stress increase linearly with organic-carbon content, which also correlates positively with diatom content. Overconsolidation measured in these tests is probably not a result of sediment erosion or slumping, but rather the result of diagenesis or interparticle bonding by organic matter. High shear strengths were measured throughout, but particularly high relative shear strengths (as indicated by friction angles and degrees of dilatancy during shear) occur near 20 mbsf. This "crustlike" behavior is probably produced by early diagenesis (perhaps including dolotomization) within the upper 20 m, and is complemented by interlocking of diatoms.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: -11.023375 * Median Longitude: -78.073579 * South-bound Latitude: -11.065000 * West-bound Longitude: -78.272170 * North-bound Latitude: -10.976660 * East-bound Longitude: -77.957670

Date/Time Start: 1986-11-01T07:00:00 * Date/Time End: 1986-11-08T18:00:00

Event(s):

112-679C * Latitude: -11.063500 * Longitude: -78.272170 * Date/Time Start: 1986-11-01T07:00:00 * Date/Time End: 1986-11-01T12:45:00 * Elevation: -458.0 m * Penetration: 75.5 m * Recovery: 69.78 m * Location: South Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 75.5 m cored; 0 m drilled; 92.4 % recovery

112-680C * Latitude: -11.065000 * Longitude: -78.077830 * Date/Time Start: 1986-11-06T14:30:00 * Date/Time End: 1986-11-06T22:00:00 * Elevation: -272.0 m * Penetration: 34.3 m * Recovery: 35.04 m * Location: South Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 34.3 m cored; 0 m drilled; 102.2 % recovery

112-681C * Latitude: -10.976660 * Longitude: -77.957670 * Date/Time Start: 1986-11-08T13:15:00 * Date/Time End: 1986-11-08T18:00:00 * Elevation: -162.0 m * Penetration: 91.4 m * Recovery: 86.24 m * Location: South Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 91.4 m cored; 0 m drilled; 94.4 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

3 datasets

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Datasets listed in this publication series

Lee, HJ; Kayen, RE; McArthur, WG (1990): (Table 2) Consolidation test results of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753804
Lee, HJ; Kayen, RE; McArthur, WG (1990): (Table 1) Index properties of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753803
Lee, HJ; Kayen, RE; McArthur, WG (1990): (Table 3) Triaxial test results of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753806