Figure 2. Magnetic anomaly map of the crust modified from the Leg 168 Scientific Prospectus. Sites were located by gridding between half-minute marks.
Figure 3.Leg 168 sites and Hydrocell 95 seismic lines.
Figure 4. Stratigraphic summary for the HT Transect area. Bed thicknesses are schematic. D = drilling depth, R = recovery depth, and L = lithology. Sediment composition is indicated by the white (turbidite sands), black (silts), and dark gray (muds) colors.
Figure 6. Comparison of Hydrothermal Transition seafloor (circles) and three borehole (squares) heat-flow determinations illustrates a good match between the two data sets.
Figure 7.Configurations of the downhole sensor strings deployed in the CORK experiments in HT Transect Holes 1024C and 1025C, and RB Transect Holes 1026B and 1027C.
Figure 8. Stratigraphic summary for the Rough Basement Transect area. Bed thicknesses are not shown to scale. Sediment composition is indicated by the white (turbidite sands), black (silts), and dark gray (muds) colors.
Figure 9.Summary of the rock types, lithological units and range of phenocrysts and groundmass minerals present at Holes 1026B, 1026C, 1027B, and 1027C, listing the diagnostic petrological features of each unit. The soft, firm, and hard pattern boxes represent the driller's estimate of the ease of drilling. VCD = Visual Core Description sheets, D = drilling depth, R = recovery depth, and L = lithology.
Figure 10.Composition of pore waters from Rough Basement sites. Arrows denote the composition of bottom seawater. Sample locations are denoted by solid circles (Holes 1026A and 1026C), solid diamonds (1026 WSTP; plotted at the depth in basement where these waters originated before flowing into the cased hole), open circles (Holes 1027B and 1027C) and open diamonds (Baby Bare springs; G. Wheat and M. Mottl, unpublished data; plotted below the sediment section for comparison.
Figure 11. A. Comparison of Rough Basement Transect seafloor (circles) and three borehole (squares) heat-flow determinations. B. Open-hole temperatures versus depth recorded with the DVTP and APC tool 11 (two deployments) in Hole 1026B. The tools were held at the depths shown for several minutes to allow thermal equilibration.
Figure 12.Stratigraphic summary for the BB Transect area. Bed thicknesses are not shown to scale. Sediment composition is indicated by the white (turbidite sands), black (silts), and dark gray (muds) colors.
Figure 13.Composition of pore waters from Buried Basement sites. The arrows denote the composition of bottom seawater. Sample locations are denoted by solid circles (Site 1030) and open circles (Site 1031).
Figure 14.Composition of pore waters from Buried Basement sites. The arrows denote the composition of bottom seawater. Sample locations are denoted by solid circles (Site 1028), open circles (Site 1029), and solid triangles (Site 1032).