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Article
Heterogeneity of the middle crust: Implications for strength of continental lithosphere
Geology (1998)
  • KE Karlstrom
  • ML Williams, University of Massachusetts - Amherst
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.
Disciplines
Publication Date
January 1, 1998
Publisher Statement
Doi:10.1130/0091-7613(1998)​026<0815:HOTMCI>​
Citation Information
KE Karlstrom and ML Williams. "Heterogeneity of the middle crust: Implications for strength of continental lithosphere" Geology Vol. 26 Iss. 9 (1998)
Available at: http://works.bepress.com/michael_williams/23/