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Science 14 July 2000:
Vol. 289. no. 5477, pp. 288 - 291
DOI: 10.1126/science.289.5477.288
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Reports
Overpressure and Fluid Flow in the New Jersey Continental Slope: Implications for Slope Failure and Cold Seeps
Brandon Dugan,
*
Peter B. Flemings
Miocene through Pleistocene sediments on the New Jersey continental
slope (Ocean Drilling Program Site 1073) are undercompacted (porosity between 40 and 65%) to 640 meters below the sea
floor, and this is interpreted to record fluid pressures that reach
95% of the lithostatic stress. A two-dimensional model, where rapid Pleistocene sedimentation loads permeable sandy silt of Miocene age,
successfully predicts the observed pressures. The model describes how
lateral pressure equilibration in permeable beds produces fluid
pressures that approach the lithostatic stress where overburden is
thin. This transfer of pressure may cause slope failure and drive cold
seeps on passive margins around the world.
503 Deike Building, Department of Geosciences, Penn State
University, University Park, PA 16802, USA.
*
To whom correspondence should be addressed. E-mail:
dugan{at}geosc.psu.edu
Read the Full Text
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