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doi:10.2204/iodp.proc.342.111.2014

Operations

All times are local ship time (UTC – 2.5 h). See Table T1 for coring summary.

Hole U1410A summary

• Latitude: 41°19.6987′N
• Longitude: 49°10.1995′W
• Water depth below sea level (m): 3387.5
• Date started: 1845 h, 20 July 2012
• Date finished: 0500 h, 22 July 2012
• Time on hole (days): 1.4
• Seafloor depth (m drilling depth below rig floor [DRF]): 3399.0
• Seafloor depth estimation method: mudline core
• Rig floor to sea level (m): 11.75
• Penetration depth (m drilling depth below seafloor [DSF]): 259.8
• Cored interval (m): 259.8
• Recovered length (m): 256.88
• Recovery (%): 99
• Total cores (number): 28
• APC cores (number): 16
• XCB cores (number): 12
• Drilling system: 11 inch advanced piston corer (APC)/extended core barrel (XCB) bit with 136.00 m bottom-hole assembly (BHA)
• Objective: core from seafloor to ~250 m DSF or until science objectives are met
• Result: target reached; objectives achieved

Hole U1410B summary

• Latitude: 41°19.6993′N
• Longitude: 49°10.1847′W
• Water depth below sea level (m): 3386.92
• Date started: 0500 h, 22 July 2012
• Date finished: 1620 h, 23 July 2012
• Time on hole (days): 1.5
• Seafloor depth (m DRF): 3398.7
• Seafloor depth estimation method: mudline core
• Rig floor to sea level (m): 11.78
• Penetration depth (m DSF): 245.2
• Cored interval (m): 245.2
• Recovered length (m): 244.84
• Recovery (%): 100
• Total cores (number): 28
• APC cores (number): 18
• XCB cores (number): 10
• Drilling system: 11 inch APC/XCB bit with 136.00 m BHA
• Objective: core from seafloor to ~250 m DSF
• Result: target reached; objectives achieved

Hole U1410C summary

• Latitude: 41°19.6885′N
• Longitude: 49°10.1854′W
• Water depth below sea level (m): 3386.9
• Date started: 1620 h, 23 July 2012
• Date finished: 0915 h, 25 July 2012
• Time on hole (days): 1.7
• Seafloor depth (m DRF): 3398.7
• Seafloor depth estimation method: mudline core
• Rig floor to sea level (m): 11.78
• Penetration depth (m DSF): 243.8
• Cored interval (m): 243.8
• Recovered length (m): 238.81
• Recovery (%): 98
• Total cores (number): 27
• APC cores (number): 16
• XCB cores (number): 11
• Drilling system: 11 inch APC/XCB bit with 136.00 m BHA
• Objective: repeat cored sequence from Hole U1410B
• Result: target reached; objectives achieved

Description

The vessel arrived at Site U1410 at 1845 h on 20 July 2012 after a 3.46 nmi transit from Site U1409 in dynamic positioning mode that took 3.5 h at 1.0 kt. The plan for Site U1410 called for drilling three holes to ~250 m DSF. Holes U1410A, U1410B, and U1410C were successfully cored to 259.8, 245.2, and 243.8 m DSF, respectively. The total time spent at Site U1410 was 110.5 h (4.6 days).

Hole U1410A coring

A 8.53 m long mudline core established seafloor depth at 3399.0 m DRF (3387.3 mbsl). Hole U1410A was spudded at 2125 h on 20 July. Cores 342-U1410A-1H through 16H were recovered to 151.0 m DSF using nonmagnetic core barrels and the FlexIT core orientation tool. Core 16H experienced the first partial stroke. The XCB was deployed for Cores 17X through 28X to the final depth of 259.8 m DSF. The seafloor was cleared at 0500 h on 22 July, ending Hole U1410A. Overall core recovery for Hole U1410A was 256.88 m for the 259.8 m interval cored (98.9% recovery). The total time spent in Hole U1410A was 34.25 h.

Hole U1410B coring

The vessel was offset 20 m east. A 3.8 m long mudline core established the seafloor at 3398.7 m DRF (3386.9 mbsl). Hole U1410B was spudded at 0650 h on 22 July. Cores 342-U1410B-1H through 18H were recovered to 153.8 m DSF using nonmagnetic core barrels and the FlexIT core orientation tool. The XCB was deployed for Cores 19X through 28X to a final depth of 245.2 m DSF. The seafloor was cleared at 1620 h on 23 July, ending Hole U1410B. The overall recovery for Hole U1410B was 244.84 m over the 245.2 m cored (99.9% recovery). The total time spent in Hole U1410B was 35.25 h.

Hole U1410C coring

The vessel was offset 20 m south, and Hole U1410C was spudded at 1825 h on 23 July. A 6.82 m long mudline core established the water depth at 3398.7 m DRF (3386.9 mbsl). Cores 342-U1410C-1H through 16H were recovered to 146.8 m DSF using nonmagnetic core barrels. No core orientation was performed in Hole U1410C. The XCB was deployed for Cores 17X through 27X to a final depth of 243.8 m DSF. Overall recovery for Hole U1410C was 238.81 m out of 243.8 m cored (98.0% recovery). The seafloor was cleared, and the vessel was secured for transit at 0915 h on 25 July, ending Hole U1410C. The total time spent on Hole U1410C was 41.00 h.

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