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- W2488691444 abstract "During the past five years, several major attempts have been made to drill deep into the oceanic basement in an effort to determine the petrology and geophysical nature of the oceanic crust. Although significant basement penetration at several sites in the Atlantic (Table 1) has provided knowledge of the petrology of at least the upper levels of the crust, low core recovery has prevented accurate reconstruction of its geophysical behavior. Recently, two attempts have been made to measure the physical properties of the oceanic basement directly by means of downhole geophysical logging. The first of these attempts (Kirkpatrick, 1979) was conducted in Hole 396B in 10-m.y.-old crust at 23°N along the Mid-Atlantic Ridge. Although the operating conditions were not ideal (the density and porosity tools could not be pressed against the side of the hole), the experiment nonetheless clearly demonstrated that in-situ compressional wave velocities in young crust are consistent with those of Layer 2A (Houtz and Ewing, 1976) and that the porosity and fluid permeability of the uppermost basement are extremely high due, presumably, to the presence of numerous cracks and interpulow voids. The second basement logging experiment was conducted in Hole 417D in 106-m.y.-old crust at the southern end of the Bermuda Rise at a water depth of 5479 meters (Figure 1). As can be seen in Figure 2, the drilled section in Hole 417 D consists of 343 meters of unconsolidated to semiconsolidated clay, claystone, and chalk of early Aptian to Recent age underlain by 366 meters of pillow basalt, breccia, and massive basalt of which 263 meters were recovered for a basement recovery of 72 per cent (Site 417 Report, this volume). Since the uppermost sediments were unstable, the hole was cased by drill pipe to a depth of 114 meters subbottom (later extended to 144 m) to prevent caving. The open hole below the pipe was then logged in four stages to an obstruction in the basement at 445 meters sub-bottom using Schlumberger temperature, natural gamma ray, density, porosity, velocity, resistivity, and caliper tools in various combinations (Table 2). In addition, the uppermost sediments were logged through the pipe using the natural gamma ray and temperature tools. The results of this experiment, together with those of the Oblique Seismic Experiment in the same hole (Stephen et al., this volume) and of" @default.
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- W2488691444 date "1980-02-01" @default.
- W2488691444 modified "2023-10-03" @default.
- W2488691444 title "Geophysical Logging in Deep Sea Drilling Project Hole 417D" @default.
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- W2488691444 doi "https://doi.org/10.2973/dsdp.proc.515253.107.1980" @default.
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