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Consolidation patterns during initiation and evolution of a plate-boundary decollement zone: northern Barbados accretionary prism

Geology

By:
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Abstract

Borehole logs from the northern Barbados accretionary prism show that the plate-boundary decollement initiates in a low-density radiolarian claystone. With continued thrusting, the decollement zone consolidates, but in a patchy manner. The logs calibrate a three-dimensional seismic reflection image of the decollement zone and indicate which portions are of low density and enriched in fluid, and which portions have consolidated. The seismic image demonstrates that an underconsolidated patch of the decollement zone connects to a fluid-rich conduit extending down the decollement surface. Fluid migration up this conduit probably supports the open pore structure in the underconsolidated patch.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Consolidation patterns during initiation and evolution of a plate-boundary decollement zone: northern Barbados accretionary prism
Series title:
Geology
Volume
26
Issue:
9
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
811
Last page:
814
Number of Pages:
4