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doi:10.2204/iodp.pr.323.2010

Operations

Site U1339

We arrived at Site U1339 early on 16 July 2009 after a 6.5 day, 1782 nmi transit from Victoria, British Columbia, Canada, and operations officially began.

Four holes were drilled at Site U1339 (Table T2) employing the APC at a water depth of 1867 m on Umnak Plateau, with the deepest Hole U1339D reaching a maximum depth of 200 m DSF. One relatively shallow and three relatively deep holes were drilled and cored as follows: Hole U1339A, cored to 34 m DSF; Hole U1339B, cored to 196 m DSF; Hole U1339C, cored to 195 m DSF; and Hole U1339D, cored to 200 m DSF. The first four cores of Hole U1339B (Cores 323-U1339B-1H to 4H) were primarily used for subseafloor microbial study with both PFTs and whirlpacks deployed. The remainder of the cores were used for paleoceanographic studies. Most of the cores had nearly 100% or greater recovery because of gas expansion except for two short cores (Cores 323-U1339B-13H, 2 m, and 323-U1339C-16H, 4.5 m) that were recovered when the APC fired into an unknown object, most likely a glacial dropstone.

Hole U1339A

Hole U1339A was spudded at 0430 h on 17 July 2009. The first core was shot with the bit at 1873 m DRF and recovered the mudline and 4.94 m of core. The hole was terminated after Core 323-U1339A-4H with a suspected bottom-hole assembly (BHA)/coring system problem resulting in almost 100,000 lb of overpull on the last core. The drill string was tripped out of the hole, the coring system components were inspected, and several parts were changed. No conclusive evidence of the encountered mechanical problem was found. The BHA was run and the coring system was tested successfully in the water column.

Hole U1339B

The vessel was offset 20 m, the rest of the string was tripped to the seafloor, and Hole U1339B was spudded at 2315 h on 17 July 2009. The first four cores (Cores 323-U1339B-1H to 4H) were dedicated to microbiology with both PFTs and whirlpacks deployed. The remainder of Hole U1339B recovered the sedimentary sequence from the total depth of Hole U1339A down to 196 m DSF, with one short core (Core 323-U1339B-13H) recovered when the APC fired into an unknown object, most likely a glacial dropstone. The nonmagnetic core barrel was switched to a steel core barrel when the resistance became exceedingly high with Core 323-U1339B-19H. Hole U1339B was cored to 196 m DSF, and coring ended at 2010 h on 18 July 2009 when the bit cleared the seafloor.

Hole U1339C

The vessel was offset 28 m and Hole U1339C was spudded at 2230 h on 18 July 2009. The first core was more than 9.5 m long but contained the mudline at its top. Core advance was a continuous 9.5 m except for Core 323-U1339C-16H, which contacted an apparent dropstone at 4.5 m. The nonmagnetic core barrel was used through Core 323-U1339C-17H, and APC coring proceeded with a steel core barrel through Core 21H to 195.8 m DSF. The drill string cleared the seafloor at 1610 h on 19 July 2009, officially ending Hole U1339C.

Hole U1339D

The vessel was offset 28.3 m and Hole U1339D was spudded at 1724 h on 19 July 2009. Core 323-U1339D-1H was 6.6 m long. All cores taken below the first one were 9.5 m long with the exception of one short core resulting from premature firing of the APC. The nonmagnetic core barrel was used through Core 323-U1339D-17H, and APC coring proceeded with a steel core barrel through Core 22H to 200.0 m DSF. Rig-up for wireline logging in Hole U1339D started at 1130 h on 20 July 2009. The triple combo and FMS-sonic tool strings were deployed; both obtained good data. The drill string was pulled and secured for transit. Transit to the next site, Site U1340 (BOW-12B), began at 0745 h on 21 July 2009. In all, APC coring for Site U1339 totaled 69 cores, 642.2 m penetrated, and 643.67 m recovered, for 103.1% recovery.

Site U1340

We arrived at Site U1340 at 2300 h on 22 July 2009 after a 1.5 day, 344 nmi transit from Site U1339. Hole U1340A was spudded at 0520 h. A total of four holes, one relatively deep and three shallow, were drilled and cored employing the APC and XCB at a water depth of 1306 m on Bowers Ridge (Table T2). A complete set of site-specific tide tables was provided by the science party for Site U1340 and were used to make adjustments relative to initial mudline core and for each successive core in each hole. The APCT-3 temperature tool was deployed four times, and three out of four of the data points fell on a linear curve describing a temperature gradient of +4.34°C per 100 m of depth. Overall recovery for Site U1340 using the APC and XCB coring systems was 91.0%.

Hole U1340A

Hole U1340A was spudded at 0520 h on 23 July 2009. Hole U1340A was cored to 603.6 m DSF, employing both the APC and XCB. APC recovery was 100%, whereas XCB recovery averaged 61%. APC coring continued through Core 323-U1340A-17H to 1461.9 DRF using nonmagnetic coring assemblies with the FlexIt orientation tool installed. The standard steel coring assemblies were used from Cores 323-U1340A-18H through 42H. APC coring was terminated after Core 323-U1340A-42H after two successive short, incomplete strokes of the core barrel. The XCB coring system was then deployed at Core 323-U1340A-43X and coring continued with the XCB system until Core 62X. After three straight zero-recovery runs, the APC coring system was redeployed. Coring with the APC system through Core 323-U1340A-67H was successful in recovering ~25 m of very sandy sediment. The XCB system was redeployed and the hole was terminated after Core 323-U1340A-71X when the XCB cutting shoe spacer sub failed, leaving a portion of the sub and the XCB cutting shoe at the bottom of the hole. The drill string was pulled back to the seafloor at 2103 h on 25 July 2009, officially ending the hole. Shear pressures were consistent throughout the coring process at 2800 psi. Recovery for Hole U1340A using the APC coring system was 105.0% with 398.8 m recovered. Recovery for Hole U1340A using the XCB coring system was 61.0% with 136.7 m recovered. Combined recovery for Hole U1340A using both the APC and XCB coring systems was 88.7%.

Hole U1340B

Hole U1340B officially began when the bit cleared the seafloor at 2103 h on 25 July 2009, ending Hole U1340A. The vessel was offset 350 m east of Hole U1340A. The top drive was picked up and the drill string was spaced out, placing the bit at 1305.4 m DRF or 5 m above the "corrected" precision depth recorder (PDR) depth of 1310.4 m DRF. The first APC barrel was pressured up and fired, the barrel recovered 6.4 m of core, and an official seafloor depth was established at 1308.5 m DRF. Hole U1340B was spudded at 2340 h on 25 July 2009. Nonmagnetic coring assemblies and the FlexIt core orientation system were used through Core 323-U1340B-6H. Hole U1340B ended at 0400 h on 26 July 2009 when the bit cleared the seafloor. Shear pressures were consistent throughout the coring process at 2800 psi. Average core recovery for the APC was 103.0%. Total depth of Hole U1340B was 1362.4 m DRF or 53.9 m CSF.

Hole U1340C

Hole U1340C officially began when the drill string cleared the seafloor at 0400 h 26 July 2009. The ship was offset 300 m south from Hole U1340A. A new PDR depth was established and the bit was placed at 1313 m DRF to optimize the core breaks between Holes U1340A and U1340B. The APC was deployed and Hole U1340C was spudded at 0620 h on 26 July 2009. Unfortunately, a mistake in the corrected PDR depth resulted in the first core being taken well below mudline. The 9.5 m of core recovered with the APC (Core 323-U1340C-1H) failed to establish the seafloor depth. APC coring continued through Core 323-U1340C-3H to 1341.5 m DRF using the FlexIt core orientation system and nonmagnetic coring assemblies. With the exception of the first core, shear pressures were consistent throughout the coring process at 2800 psi. Overall core recovery for the APC was 105.3%. The drill string was pulled clear of the seafloor at 0835 h on 26 July, officially ending Hole U1340C.

Hole U1340D

Hole U1340D officially began when the drill string cleared the seafloor at 0835 h 26 July. The ship was offset 20 m from Hole U1340C at 180°. This hole was spudded at 0905 h on 26 July, and the 7.3 m recovered with Core 323-U1339D-1H established a seafloor depth of 1304.7 m DRF. Three APC cores were shot to 26.3 m CSF. APC coring through Core 323-U1340D-3H used the nonmagnetic coring assemblies with FlexIt orientation. Shear pressures were consistent throughout the coring process at 2800 psi. APC core recovery was 103.5%. The drill string was then pulled clear of the seafloor and secured for transit. Once the drill collars were racked back and the rig floor was secured for transit, control was transferred from dynamic positioning (DP) to the bridge. The ship was placed in cruise mode at 1534 h on 26 July for the scheduled 6 h (65 nmi) transit to Site U1341 (BOW-14B). Official APC coring totals for Site U1340 included 83 total cores, 712.3 m penetrated, and 648.1 m recovered, for 91.0% recovery.

Site U1341

A positioning beacon was deployed at 2311 h on 26 July after our arrival at Site U1341. Three holes were drilled at this site (Table T2). A complete set of site-specific tide tables was provided by the science party for Site U1341, and these were used to make adjustments relative to initial mudline core and for each successive core on each hole. A new continuous APC coring depth record was established when Hole U1341B reached 458.4 m DSF. APC coring totals for Site U1341 included 148 total cores, 1189.4 m penetrated, and 1201.54 m recovered, for 101% recovery. The time spent at Site U1341 was 170.5 h or 7.1 days.

Hole U1341A

Hole U1341A was spudded at 0510 h on 27 July. The first APC barrel recovered 3.04 m of core and an official seafloor depth was established at 2150.9 m DRF. APC coring continued through Core 323-U1341A-20H to 2334.4 m DRF using nonmagnetic coring assemblies and with the FlexIt orientation tool installed. The nonmagnetic coring equipment was changed to the standard APC coring system and coring continued. Coring with the APC system was suspended at Core 323-U1341A-41H after two successive short, incomplete strokes of the core barrel. Overall recovery for Hole U1341A using the APC coring system was 101% with 364.94 m recovered.

Hole U1341B

The vessel was offset 20 m east of Hole U1341A. Hole U1341B was spudded at 2245 h on 28 July. The first APC barrel recovered 8.7 m of core and an official seafloor depth was established at 2150.9 m DRF. APC coring continued through Core 323-U1341B-18H to 166.7 m DSF using nonmagnetic coring assemblies and with the FlexIt orientation tool installed. Coring with the APC system was suspended at Core 323-U1341B-56H after three successive short, incomplete short strokes of the core barrel. A new continuous APC coring record was established with continuous piston cores from the mudline to 458.4 m DSF or CSF. The XCB coring system was then deployed from Cores 323-U1341B-57X through 71X. The hole was terminated after Core 323-U1341A-71X when the total depth of the hole reached 600.0 m DSF. APC core recovery for Hole U1341B was 102% with 467.64 m recovered. XCB core recovery for Hole U1341B was 88.2% with 126.9 m recovered. Total core recovery was 98.7% with 594.5 m recovered. The coring tools were secured and the hole was swept clean and then displaced with 200 bbl of high-viscosity logging mud. No fill was identified at total depth. The top drive was set back and the drill pipe was tripped to 80 m DSF while monitoring the hole for problems. The end-of-pipe (EOP) was placed at ~80.0 m DSF. Rig-up for wireline logging began at 1930 h on 31 July. Two logging strings were deployed. The triple combo tool string reached a total hole depth of 600 m WSF and good quality logs were obtained. The FMS-sonic tool string also reached total depth of 600 m WSF and also obtained good data on both passes. Wireline logging in Hole U1341B was successfully concluded and all logging equipment was rigged down by 1530 h on 1 August.

Hole U1341C

Operations in Hole U1341C commenced at 1555 h on 1 August. The vessel was moved 20 m east of Hole U1341B. Hole U1341C was spudded at 1810 h. The first APC barrel recovered 5.5 m of core and an official seafloor depth was established at 2150.9 m DRF. APC coring continued through Core 323-U1341C-17H to 147 m DSF using nonmagnetic coring assemblies and with the FlexIt orientation tool installed. Standard steel core barrels were then installed and coring continued through Core 323-U1341C-27H (230 m DSF). Overall core recovery for the APC was 242.06 m (106.2%).

Site U1342

Four holes were drilled at this site. The first was cored using the APC system to refusal. When refusal was met early, the XCB system was deployed to confirm formation material. The XCB recovered 0.5 m of basalt, effectively ending Hole U1342A. The second hole, U1342B, was dedicated to microbiology. Hole U1342C was cored with the APC system to 45.4 m DSF. The last hole, U1342D, was APC cored to 44.0 m DSF. At that point, a center bit was dropped and the hole was drilled ahead for 18.6 m to determine if the basalt was continuous or not. At a drilling break, the XCB system was deployed and used to take 13 cores of hard rock to the total hole depth of 127.4 m DSF. A complete set of site-specific tide tables was provided by the science party for Site U1342. The tide tables were used to make adjustments relative to initial mudline core and for each successive core in each hole. APC coring totals included 182 m penetrated with 194.11 m recovered (a recovery of 106.7%). XCB coring totals for Site U1342 included 66.1 m of penetration with 41.54 m recovered (62.8% recovery). The total cored interval was 248.1 m with 235.65 m of core recovered for a 95% total recovery. The time spent at Site U1342 was 33.25 h or 1.4 days.

Hole U1342A

Hole U1342A was spudded at 1320 h on 3 August, recovering 1.8 m of sediment in the first APC barrel and establishing an official seafloor depth of 829.7 m DRF. APC coring continued through Core 323-U1342A-8H to 49.3 m DSF. Coring with the APC system was suspended after two successive short, incomplete strokes of the core barrel and apparent refusal. Three meters were then drilled with the APC/XCB bit and the XCB system was deployed; a short core (1 m) was drilled to identify the material at APC refusal. Basalt was recovered and Hole U1342A was terminated. Overall recovery for Hole U1342A using the APC coring system was 115.5% with 56.93 m recovered. Recovery for the XCB core was 0.46 m or 46% recovery.

Hole U1342B

The vessel was offset 20 m east of Hole U1342A. Hole U1342B was spudded at 2315 h on 3 August. The barrel recovered 5.33 m of core, and an official seafloor depth was established at 830.4 m DRF. APC coring continued through Core 323-U1342B-5H to 43.3 m DSF.

Hole U1342C

The vessel was moved 20 m east of Hole U1342B. The first APC barrel recovered 7.2 m of core and an official seafloor depth was established at 830.3 m DRF. Hole U1342C was spudded at 0235 h on 4 August. APC coring continued through Core 323-U1342C-6H to refusal. Overall recovery for Hole U1342C using the APC coring system was 103.7% with 47.06 m recovered.

Hole U1342D

The vessel was moved 20 m east of Hole U1342C. The first APC barrel recovered 6.0 m of core and an official seafloor depth was established at 829.7 m DRF. Hole U1342D was spudded at 0830 h on 4 August. APC coring continued through Core 323-U1342D-5H to 873.7 m DRF. On reaching refusal, the center bit was dropped and the hole was drilled 18.6 m to see if there were sediments under the layer of hard rock (basalt). After a drilling break was observed, the XCB coring system was deployed and used successfully to core an additional 65.10 m into the formation. Overall recovery for Hole U1342A using the APC coring system was 102.9% with 45.29 m recovered. Recovery with the XCB core was 41.08 m or 63.1% recovery.

Site U1343

Five holes were cored at Site U1343. Hole U1343A was cored with the APC system and drilled to 201.5 m DSF. Hole U1343B was dedicated to microbiology and cored to 35.5 m DSF. Hole U1343C was cored with the APC system to 234.2 m DSF. Only a single mudline core was taken in Hole U1343D and a decision was made to attempt another mudline core for stratigraphic correlation. Hole U1343E was cored with the APC and XCB systems to 744.3 m DSF. The XCB system was used for Cores 323-U1343E-42X through 45X, where we encountered dry sediment and retrieved a destroyed core liner (42X), and for the deepest cores (Cores 323-U1343-50X through 83X). The shallower interval cored with the XCB system coincided with a BSR. Generally, coring was routine except for biogenic methane encountered in the cores, which complicated the curation of all cores at this site. APC coring totals for Site U1343 included 98 cores, 860.4 m penetrated, and 859.8 m recovered for 99.9% recovery. XCB coring totals for Site U1343 included 37 cores, 360.6 m penetrated, and 318.14 m recovered for 62.8% recovery. The total cored interval for Site U1343 was 1221.0 m, with 1178.23 m of core recovered for a 96.5% total recovery. The time spent at Site U1343 was 6.7 days.

Hole U1343A

Hole U1343A was spudded at 0305 h on 7 August. The first mudline core recovered 5.5 m of sediment and the seafloor was calculated at 1962.4 m DRF. APC coring continued through Core 323-U1343A-22H to 201.5 m DSF using nonmagnetic coring assemblies. Temperature measurements were taken on Cores 323-U1343A-5H, 9H, and 14H with the APCT-3 temperature tool. Core orientation was taken on all cores with the FlexIt orientation tool, but the data were lost when the computer running the download software was accidentally switched off during the FlexIt operations, causing the program to lose its synchronization with the tool. Overall recovery for Hole U1343A using the APC system was 101.2% with 203.86 m recovered.

Hole U1343B

The vessel was offset 30 m north and Hole U1343B was spudded at 2240 h on 7 August. The first mudline core recovered 6.85 m of sediment and the seafloor was calculated at 1962.4 m DRF. Both PFT and microsphere contamination testing methods were deployed. A total of four APC cores were recovered for microbiological sampling to 35.5 m DSF. Average APC core recovery for Hole U1343B was 97.4% with 34.56 m recovered.

Hole U1343C

The ship was offset 30 m west from the proposed site position. The APC was deployed and Hole U1343C was spudded at 0305 h on 8 August. The first mudline core recovered 7.2 m of sediment and the seafloor was calculated at 1964.2 m DRF. APC coring continued through Core 323-U1343C-26H to 234.2 m DSF using nonmagnetic coring assemblies. Overall recovery for Hole U1343C using the APC coring system was 98.7% with 231.04 m recovered.

Hole U1343D

Hole U1343D was spudded 30 m south of Hole U1343C at 0135 h on 9 August. Based on the stratigraphic correlation of the first and only core, Hole U1343D was terminated at 0135 h. Overall recovery for Hole U1343D using the APC coring system was 100.0% with 8.5 m recovered.

Hole U1343E

There was no offset from Hole U1343D. Hole U1343E was spudded at 0215 h on 9 August. The first core barrel recovered 8.2 m of core and an official seafloor depth was established at 1967.5 m DRF. APC coring continued through Core 323-U1343E-15H using standard steel core barrels. At Core 323-U1343E-16H, the nonmagnetic barrels were put in service and used for the rest of the hole. Coring with the APC system was suspended after Core 323-U1343E-41H was pulled with a ruptured core liner. Core 41H had to be hydraulically pressed out of the core barrel. This coincided with a BSR observed in the seismic data. The core was also noticeably drier and harder at this depth. The XCB coring system was then deployed from Cores 323-U1343E-42X through 45X with good recovery. The APC coring system was then put back in service for Cores 323-U1343E-46H to 49H. At that time we began to get partial strokes of the piston and were having to drill over every core. The XCB system was redeployed and coring continued through Core 323-U1343E-83X to 744.3 m DSF. The coring tools were secured and the hole was swept clean and then displaced with 200 barrels of prepared high-viscosity logging mud. No fill was identified at total depth. Two logging strings were deployed. The triple combo tool string reached total depth of 745 m DSF and good quality logs were obtained. The second logging string consisted of the FMS-sonic tool, which reached total depth of 745 m DSF and also obtained good data on both passes. Wireline logging in Hole U1343E was successfully concluded and all logging equipment was rigged down by 0745 h on 13 August. APC core recovery for Hole U1343E was 100.3% with 381.86 m recovered. XCB core recovery for Hole U1343E was 88.3% with 318.41 m recovered. Total core recovery for Hole U1343E was 94.47% with 700.27 m recovered.

Site U1344

Five holes were cored at Site U1344. The first hole was cored with the APC/XCB systems to 745.0 m DSF. Hole U1344A was then successfully logged with the triple combo and FMS-sonic logging tool strings. The second hole, planned as a dedicated microbiology hole, was cut short due to contamination when the core liner split during mudline coring. Therefore, the third hole was assigned to microbiology. Hole U1344D was cored with the APC system to 286.5 m DSF. The last hole, Hole U1344E, was cored with the APC system to 202.8 m DSF. A complete set of site-specific tide tables provided by the science party was used to make adjustments relative to initial mudline core and for each successive core in each hole. Coring in general was routine except for biogenic methane encountered in the cores, which complicated the curation of all cores at this site. APC coring totals for Site U1344 included 87 cores, 781.8 m penetrated, and 791.1 m recovered for 101.2% recovery. XCB coring totals for Site U1344 included 52 cores, 489.9 m penetrated, and 384.1 recovered for 78.4% recovery. The total cored interval for Site U1344 was 1271.7 m with 1175.19 m of core recovered for a 92.4% total recovery. The time spent at Site U1344 was 8.5 days.

Hole U1344A

The first APC barrel recovered 9.1 m of core and an official seafloor depth was established at 3183.4 m DRF. Hole U1344A was spudded at 0932 h on 14 August. APC coring continued through Core 323-U1344A-26H to 245.6 m DSF using nonmagnetic coring assemblies. The XCB system was deployed and coring continued through Core 323-U1344A-79X to 745.0 m DSF. The coring tools were secured and the hole was swept clean and then displaced with 200 barrels of prepared high-viscosity logging mud. No fill was identified at total depth. The EOP was placed at ~100.0 m DSF. Two logging strings were deployed. The triple combo tool string reached total hole depth of 745 m CSF and good quality logs were obtained. The second logging string consisted of the FMS-sonic tool. This tool string also reached total depth of 745 m CSF on the first pass but reached only 725 m CSF on the second pass as hole conditions began to deteriorate. Good data were obtained on both passes. APC core recovery for Hole U1344A was 103.5% with 264 m recovered. XCB core recovery for Hole U1344A was 78.4% with 384.1 m recovered. Total core recovery for Hole U1344A was 87% with 648.1 m recovered.

Hole U1344B

The vessel was offset 20 m north of Hole U1344A. Hole U1344B was spudded with the APC at 1335 h on 19 August. One APC core was recovered. Unfortunately, Core 323-U1344B-1H came to the surface with a split/damaged core liner and was unfit for microbiological studies.

Hole U1344C

The first APC barrel recovered 7.12 m of core and an official seafloor depth was established at 3184.4 m DRF. Hole U1344C was spudded at 1505 h on 19 August. Both PFT and microsphere contamination testing methods were deployed. A total of four APC cores were recovered for microbiological studies to a depth of 35.6 m. Average core recovery for the APC in Hole U1344B was 94.13% with 33.5 m recovered.

Hole U1344D

The ship was offset 20 m north from Hole U1344C. The APC was deployed and Hole U1344C was spudded at 1940 h on 19 August. The first mudline core recovered 2.73 m of sediment and the seafloor was calculated at 3185.8 m DRF. APC coring continued through Core 323-U1344C-25H to 224.5 m DSF using nonmagnetic coring assemblies. The nonmagnetic coring equipment was changed to the standard APC coring system and coring continued. Coring with the APC system was suspended after Core 323-U1344D-32H at 286.5 m DSF. Only two cores, Cores 323-U1344D-30H and 32H, required drill over. Overall recovery for Hole U1344D using the APC coring system was 99.9% with 286.1 m recovered.

Hole U1344E

The ship was offset 20 m north from Hole U1344D. The first APC barrel recovered 5.3 m of core and an official seafloor depth was established at 3185.7 m DRF. Hole U1344E was spudded at 0750 h on 21 August. APC coring continued through Core 323-U1344E-23H using nonmagnetic coring assemblies. Coring was uneventful and continuous except for a 3 m section at 3276.5 m DRF, which was drilled at the request of the stratigraphic correlator. APC core recovery for Hole U1344E was 101.4% with 202.7 m recovered.

Site U1345

Five holes were cored at this site. With the exception of Hole U1345B, which was cored to 36.7 m DSF for microbiological sampling, four holes were cored to ~150 m DSF. A complete set of site-specific tide tables was provided by the science party for making coring adjustments relative to the initial mudline core and for each successive core in each hole. Coring in general was routine except for biogenic methane encountered in the cores, which complicated the curation of all cores at this site. Two complete splices were obtained at Site U1345 to ~150 m CSF. APC coring totals for Site U1345 included 68 cores, 632.1 m penetrated, and 648.35 m recovered for 102.6% recovery. The time spent at Site U1345 was 2.2 days.

Hole U1345A

Hole U1345A was spudded at 0045 h on 23 August. The first APC core barrel recovered 4.39 m of sediment, establishing a seafloor depth of 1019.1 m DRF. APC coring continued through Core 323-U1345A-16H to 146.9 m DSF using nonmagnetic coring assemblies. Temperature measurements were taken in Cores 323-U1345A-5H, 8H, and 12H with the APCT-3 temperature tool. APC core recovery for Hole U1345A was 101.1% with 148.49 m recovered.

Hole U1345B

The ship was offset 20 m northwest of Hole U1345A. Both PFTs and microspheres were deployed for contamination testing. A total of four APC cores were recovered for use as microbiology samples to 36.7 m. Average core recovery for the APC in Hole U1345B was 104.2% with 38.24 m of sediment recovered.

Hole U1345C

The ship was offset 20 m northwest of Hole U1345B. APC coring continued through Core 323-U1345C-16H to 148.5 m DSF using nonmagnetic coring assemblies. 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 continued through Core 323-U1345D-16H to 150.0 m DSF using nonmagnetic coring assemblies. 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 continued through Core 323-U1345E-16H to 150.0 m DSF using nonmagnetic coring assemblies. APC core recovery for Hole U1345E was 102.8% with 154.15 m recovered.

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