OPERATIONS
Site 1086
(Proposed Site SCB-E)
Hole 1086A
The 157-nmi voyage to Site 1086 was accomplished at an average speed of 8.8 kt. The speed of the vessel was adversely affected because of the northward-flowing Benguela Current, combined with rough seas. The vessel approached the GPS coordinates of the site and deployed a beacon at 1900 hr on 1 October. Hole 1086A was spudded with the APC at 2240 hr. The seafloor depth was estimated from the recovery of the first core at 792.8 m. APC coring advanced without incident to 206.2 mbsf (Cores 175-1086-1H through 22H), which was considered refusal depth for piston coring. APC recovery for Hole 1086A was 102.4%. Cores were oriented starting with 3H. Adara temperature tool heat-flow measurements were not obtained at this site. The drill string was pulled out of the hole, with the bit clearing the seafloor at 0925 hr on 2 October, thereby ending Hole 1086A.
Hole 1086B
The vessel was offset 30 m to the west, and Hole 1086B was spudded with the APC at 1010 hr on 2 October. The recovery of the first core established the seafloor depth at 796.2 m. APC Cores 175-1086B-1H through 23H were taken from 0 to 212.1 mbsf with 101.7% recovery. The last core did not achieve a full piston stroke. Cores were oriented starting with 4H. The drill string was then retrieved, with the bit clearing the seafloor at 2230 hr. The beacon was recovered, and the hydrophones and thrusters were retracted. The vessel was under way to the next site at 0030 hr on 3 October.
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