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doi:10.2204/iodp.proc.331.105.2011

Operations

Arrival at Site C0015

The D/V Chikyu moved to Site C0015 on the morning of 18 September 2010, with the bottom-hole assembly (BHA) hanging at 500 m water depth. The last 500 m was covered in dynamic positioning mode with the BHA lowered to 911 m water depth while the ROV was deployed for a seafloor survey (Table T1; Fig. F2).

Hole C0015A

Hole C0015A was drilled without coring on 18 September 2010 to 6 mbsf to check the hardness of the formation. The seabed was found to be soft enough to penetrate with the HPCS for at least the mudline core.

Hole C0015B

The first cored hole (C0015B, on 18 September 2010) was 1 m south of Hole C0015A. The bit tagged the seafloor at 914.5 m water depth and pulled up to 3 m above seafloor. The hole was shot with the HPCS from 0 to 6.5 mbsf, after which the bit was pulled back up.

Hole C0015C

The second core was taken 4 m northeast of Hole C0015A on 18 September 2010. The seafloor was tagged at 914 m water depth, and the hole was drilled ahead to 6.5 mbsf before the HPCS was shot. The coring shoe penetrated only 2.9 m, to a total depth of 9.4 mbsf. Discoloration of the core liner suggested it was affected by heat.

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