The logging and CORK installation in Hole 395A were completed ahead of schedule, allowing time to offset the ship and core the sediments of North Pond. These sediments had not been properly cored during the original drilling leg, which was well before the advent of the hydraulic piston corer. The ship was offset 4.5 km to the northwest of Hole 395A to the zone of highest measured heat flow in North Pond, where we expected results of hydrologic importance in addition to the more basic goal of properly recovering the sediments of North Pond. At Hole 1074A, a 64-m-thick section of sediments and underlying 0.6 m of basalt were recovered using the advanced hydraulic piston corer/extended core barrel assembly. The sediments are predominantly nannofossil ooze with 2 m of red clay overlying the basalts. Hirano et al. (Chap. 1, this volume) studied microtextures of sediment samples from Hole 1074B and report on the relationship between foraminifer content and consolidation state of the sediments.
During Leg 174B, sediment temperatures were measured with the Adara shoe and pore-water chemistry was analyzed throughout the core. The temperature profile is conductive and the pore-water profile diffusive with no evidence for advection through the sediments associated with relatively high heat flow in North Pond. The temperature profile extrapolates to a value of ~7°C at the top of basement near the western edge of North Pond—very close to the value predicted by the Langseth et al. (1984) model (Fig. F2). This result and the lack of evidence for advection through the sediments at the site provide further corroboration for the Langseth et al. (1984) model of fluid flow confined to basement beneath North Pond.