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doi:10.2204/iodp.proc.323.109.2011

Operations

Five holes were cored at Site U1345 (Table T1). With the exception of Hole U1345B, which was cored for microbiological sampling to 36.7 m drilling depth below seafloor (DSF), four holes were cored to ~150 m DSF. A complete set of site-specific tide tables was provided by the science party to make coring adjustments relative to the initial mudline core and each successive core in each hole. Coring was generally routine, except for encountering biogenic methane in the cores, which complicated the curation of all cores at this site. Two complete splices were obtained at Site U1345 to ~150 meters below seafloor (mbsf). Advanced piston corer (APC) coring for Site U1345 totaled 68 cores, 632.1 m penetrated, and 648.65 m recovered, for 102.6% core recovery. The time spent at Site U1345 was 2.2 days.

Hole U1345A

Hole U1345A was spudded at 0045 h on 23 August 2009 (all times are ship local time, Universal Time Coordinated [UTC] – 11 h). The first APC core barrel recovered 4.39 m of sediment, establishing the seafloor depth at 1019.1 m drilling depth below rig floor (DRF). APC coring using nonmagnetic coring assemblies continued through Core 323-U1345A-16H to 146.9 m DSF. Temperature measurements were taken on Cores 323-U1345A-5H, 8H, and 12H with the third-generation advanced piston corer temperature tool (APCT-3). APC core recovery for Hole U1345A was 101.1%, with 148.24 m recovered.

Hole U1345B

The ship was offset 20 m northwest of Hole U1345A. Both perfluorocarbon tracer (PFT) and microspheres were deployed for contamination testing. Four APC cores were recovered to 36.7 m DSF for use as microbiology samples. Average APC core recovery for Hole U1345B was 105.7%, with 38.79 m of sediment recovered.

Hole U1345C

The ship was offset 20 m northwest of Hole U1345B. APC coring using nonmagnetic coring assemblies continued through Core 323-U1345C-16H to 148.5 m DSF. APC core recovery for Hole U1345C was 102.9%, with 152.85 m recovered.

Hole U1345D

The ship was offset 20 m northwest of Hole U1345C. APC coring using nonmagnetic coring assemblies continued through Core 323-U1345D-16H to 150.0 m DSF. APC core recovery for Hole U1345D was 103.1%, with 154.62 m recovered.

Hole U1345E

The ship was offset 20 m northwest of Hole U1345D. APC coring using nonmagnetic coring assemblies continued through Core 323-U1345E-16H to 150.0 m DSF. APC core recovery for Hole U1345E was 102.8%, with 154.15 m recovered.

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