Rapid sedimentation, overpressure, fluid flow and slope instability at the Gulf of Mexico continental margin.

Behrmann, Jan H. , Flemings, P. B., John, C. M., Iturrino, G. J., Aizawa, Y., Binh, N. T. T., De Silva, N., Dugan, B., Edeskär, T. M., Franke, C., Gay, A., Gilhooly , W. P., Gutierrez-Pastor, J., Jiang, S. Y., Long, H., Moore, J. C., Nonoura, T., Pirmez, C., Reichow, M., Sawyer, D. E., Schneider, J., Suzuki, T., Takano, Y., Urgeles, R., Yamamoto, Y. and Zampetti, V. and IODP Expedition 308 Scientists (2008) Rapid sedimentation, overpressure, fluid flow and slope instability at the Gulf of Mexico continental margin. Open Access IFM-GEOMAR Annual Report, 2007 . pp. 31-34.

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Abstract

Integrated Ocean Drilling Programme (IODP) Expedition 308 studied overpressure and fluid flow on the Gulf of Mexico continental slope. The scientific program examined how sedimentation, overpressure, fluid flow, and
deformation are coupled in a passive continental margin setting. The expedition
investigated the model of how extremely rapid deposition of finegrained mud leads to rapid build-up of pore pressure in excess of hydrostatic (overpressure), underconsolidation
and continental slope instability. Expedition
308 tested this model by examining how physical properties, pressure, temperature, and pore fluid compositions vary within low-permeability
mudstones that overlie a permeable, overpressured aquifer. Three sites were drilled in the Ursa Basin off the Mississippi Delta, using the research drillship R/V JOIDES RESOLUTION (Fig. 1). In the Ursa Basin rapid, late Pleistocene sedimentation was known to be
present. Drilling documented severe overpressure in the mudstones overlying the aquifer. The most important achievement of IODP Expedition 308 is to have successfully recorded in situ formation pressure and temperature in
an overpressured basin. This is the first time that a coherent data set of such measurements has been obtained.

Document Type: Article
Keywords: Gulf of Mexico, Golf von Mexico, Integrated Ocean Drilling Programe, IODP Expedition 308, sedimentation, Sedimentation, overpressure, Überdruck, slope insability, Hanginstabilität, deformation, Deformation continental margin, Kontinentalrand
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: No
Open Access Journal?: Yes
Date Deposited: 16 Oct 2012 07:14
Last Modified: 16 Oct 2018 13:25
URI: http://oceanrep.geomar.de/id/eprint/15476

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