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

Moore, J. Casey, Klaus, Adam, Bangs, Nathan L., Bekins, Barbara, Bücker, Christian J., Brückmann, Warner, Erickson, Stephanie N., Hansen, Olav, Horton, Thomas, Ireland, Peter, Major, Candace Olson, Moore, Gregory F., Peacock, Sheila, Saito, Saneatsu, Screaton, Elizabeth J., Shimeld, John W., Henry Stauffer, Philip, Taymaz, Tuncay, Teas, Philip A. and Tokunaga, Tomochika (1998) Consolidation patterns during initiation and evolution of a plate-boundary decollement zone: Northern Barbados accretionary prism Geology, 26 (9). pp. 811-814. DOI 10.1130/0091-7613(1998)026<0811:CPDIAE>2.3.CO;2.

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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.

Document Type: Article
Keywords: Northern Barbados accretionary prism; plate-boundary decollement zone
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1130/0091-7613(1998)026<0811:CPDIAE>2.3.CO;2
ISSN: 0091-7613
Projects: ODP
Date Deposited: 01 Mar 2016 14:01
Last Modified: 10 Apr 2017 12:35
URI: http://eprints.uni-kiel.de/id/eprint/31648

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