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• W2189474475 abstract "At the end of Leg 156, Hole 949C was sealed and a CORK (circulation obviation retrofit kit) was installed for long-term monitoring of temperatures and pressures to study the hydrology of the Barbados accretionary prism. The hole was completely cased except for a 53-m perforated and screened section spanning the decollement, so that CORK pressures should reflect hydrologic conditions in the decollement. Nearly a year and a half after beginning the experiment, a 512-day record was obtained by using the submersible Nautile. The temperature data define a linear gradient consistent with the 82°C/km gradient determined during Leg 156, and they show no evidence of transients caused by fluid flow. Pressures in the decollement stabilized after 250 days at a value of 1.02 MPa above hydrostatic, less than one-third of the overburden pressure. At this fluid pr essure value, there should be little enhancement of permeability along the decollement, and the pressure data show little evidenc e for the transient flow processes thought to dominate the hydrology of fine-grained accretionary prisms like those off Barbados. A step-wise increase of pressure from 0.9 MPa to the stable value of 1.02 MPa was observed from 170 to 250 days, and this might be interpreted as a minor fluid-flow event. The tidal loading signal was recorded in the sealed hole attenuated to about 85% of the seafloor level, with a phase lag of about 15 min. The attenuation value is consistent with the high porosity of the muddy sediments (~60%). The phase lag requires a contrast in the bulk moduli of the sediments in the decollement as opposed to those above or below the decollement, consistent with its seismic signature and its nature as a plate boundary fault. The CORK experiment continues to function in Hole 949C and should provide further data through 1997." @default.
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• W2189474475 date "1997-11-01" @default.
• W2189474475 modified "2023-10-17" @default.
• W2189474475 title "The CORK experiment in Hole 949C: long-term observations of pressure and temperature in the Barbados accretionary prism" @default.
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• W2189474475 doi "https://doi.org/10.2973/odp.proc.sr.156.031.1997" @default.
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