2013•Unpublished venueRequires access
decollement zone: Northern Barbados accretionary prism Consolidation patterns during initiation and evolution of a plate-boundary
Tuncay Taymaz, Philip A. Teas, Sheila Peacock, Saneatsu Saito, Elizabeth J. Screaton, John W. Shimeld, Stephanie N. Erickson, Olav R. Hansen, Thomas Horton, Peter Ireland, Adam Klaus, Nathan L. B. Bangs, B. Bekins, C. Bücker, Warner Brückmann
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Abstract
Borehole logs from the northern Barbados accretionary prism show that the plateboundary decollement initiates in a low-density radiolarian claystone. With continued thrusting, the decollement zone consolidates, but in a patchy manner. The logs calibrate a threedimensional 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. on January 19, 2013 geology.gsapubs.org Downloaded from