Consolidation tests, elastic properties and grain size measurements at the consolidations samples from different Holes of IODP Expedition 302 ...

The Integrated OceanDrilling Program's Expedition 302, the Arctic Coring Expedition (ACEX), recovered the first Cenozoic sedimentary sequence from the central Arctic Ocean. ACEX provided ground truth for basin scale geophysical interpretations and for guiding future exploration targets in this...

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Bibliographic Details
Main Authors: O'Regan, Matthew, Moran, K, Baxter, C D P, Cartwright, J, Vogt, Christoph, Kölling, Martin
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2012
Subjects:
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
Arctic Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.788585
https://doi.pangaea.de/10.1594/PANGAEA.788585
Description
Summary:The Integrated OceanDrilling Program's Expedition 302, the Arctic Coring Expedition (ACEX), recovered the first Cenozoic sedimentary sequence from the central Arctic Ocean. ACEX provided ground truth for basin scale geophysical interpretations and for guiding future exploration targets in this largely unexplored ocean basin. Here, we present results from a series of consolidation tests used to characterize sediment compressibility and permeability and integrate these with high-resolution measurements of bulk density, porosity and shear strength to investigate the stress history and the nature of prominent lithostratigraphic and seismostratigraphic boundaries in the ACEX record. Despite moderate sedimentation rates (10-30 m/Myr) and high permeability values (10**-15 -10**-18 m**2), consolidation and shear strength measurements both suggest an overall state of underconsolidation or overpressure. One-dimensional compaction modelling shows that to maintain such excess pore pressures, an in situ fluid source is ...

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