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OPERATIONS

SITE 1083
(Proposed Site WB-C)

Hole 1083A
The 55-nmi voyage to Site 1083 was accomplished at an average speed of 12.5 kt. The vessel approached the GPS coordinates of the site and deployed a beacon at 0510 hr on 17 September. Hole 1083A was spudded with the APC at 1000 hr. The seafloor depth was established from the recovery of the first core at 2189.7 m. APC coring advanced without incident to 201.3 mbsf with 92.1% recovery. APC refusal was reached when the core barrel of Core 1083A-22H got stuck and required drilling over. Cores were oriented starting with 3H. The bit cleared the seafloor at 0225 hr on 18 September, thereby ending operations at Hole 1083A.

Hole 1083B
The vessel was offset 30 m to the south, and Hole 1083B was spudded with the APC at 0405 hr. The recovery of the first core established the seafloor depth at 1294.7 m. APC coring advanced to 202.3 mbsf with 102.0% recovery. The last core (Core 175-1083B-22H) required redrilling to free the stuck core barrel. Cores were oriented starting with 4H. The bit cleared the seafloor at 2110 hr on 18 September.

Holes 1083C and 1083D
The vessel was offset 30 m to the south. Hole 1083C consists of one failed mudline core. Hole 1083D was spudded with the APC at 2350 hr on 18 September. The recovery of the first core established the seafloor depth at 2189.9 m. APC coring advanced to 196.1 mbsf with 103.0% recovery. Cores were oriented starting with 3H. The drill string was retrieved, with the bit clearing the seafloor at 1420 hr and the plane of the rotary table at 1855 hr on 19 September. The beacon was recovered, and the hydrophones and thrusters retracted. The vessel was under way to Site 1084 were at 1900 hr on 19 September.


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