Daily Report for IODP Expedition 311, October 20, 2005
LOCATION: Site U1325 (CAS-02C)
SCIENCE UPDATE: We spudded the new continuous core hole at this site, Hole U1325C, at 08:20 hr and advanced the hole by drilling to a depth of 188 mbsf where coring recovery in Hole U1325B began to deteriorate. Coring operations were initiated with the deployment of the XCB system at 21:15 hr and the first core returned with only 3.28 m of sediment. This core contained a IR imaged core spot that was sampled for interstitial water analyses. We decided to try cutting XCB half cores (~5 m long) to see if this would increase core recovery. The first short XCB core recovered only 0.73 m of sediment that also contained a prominent cold spot. The first half section was used for interstitial water analyses. The second short XCB core, which was taken into the next morning, was recovered without any sediment. We decided to switch back to standard full length XCB core deployments.