Consolidation tests of ODP Leg 113 samples

Examination of the geotechnical characteristics of Weddell Sea, Maud Rise, and South Orkney microcontinental margin sediments recovered during ODP Leg 113 reveals that the reduction in porosity (consolidation) of the siliciclastic, calcareous, and diatomaceous sediments is primarily a process govern...

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Bibliographic Details
Main Authors: Bryant, William, Rack, Frank R
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1990
Subjects:
113-689C
113-689D
113-690C
113-693A
113-695A
113-696A
113-697B
DRILL
Drilling/drill rig
Joides Resolution
Leg113
Ocean Drilling Program
ODP
South Atlantic Ocean
Weddell Sea
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.754290
https://doi.org/10.1594/PANGAEA.754290
Description
Summary:Examination of the geotechnical characteristics of Weddell Sea, Maud Rise, and South Orkney microcontinental margin sediments recovered during ODP Leg 113 reveals that the reduction in porosity (consolidation) of the siliciclastic, calcareous, and diatomaceous sediments is primarily a process governed by vertical stresses created by overburden. The initial porosity of the sediments in these areas is governed by the amount of diatoms present. The more diatoms, the higher the porosity. Surficial diatom-rich sediments are everywhere overconsolidated. This is attributed to the strong microfabric created by the diatoms, calcareous and clay particles. The deeper diatom-free sediments of Maud Rise range from slightly underconsolidated to normally consolidated. The silty clays and clays of the Weddell Sea and South Orkney margin are underconsolidated. The degree of underconsolidation of these sediments is similar to that determined in a number of different locations throughout the world's oceans. The very low permeability of the Weddell Sea and South Orkney margin sediments appears to account for this underconsolidation.

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