Daily report for IODP Expedition 311, September 28, 2005
LOCATION: Site U1329 (CAS-05D)
SCIENCE UPDATE: APC coring in Hole U1329C continued to 140.2 mbsf (106% recovery) where we switched to XCB coring and advanced the hole to 188.5 mbsf (82% recovery). Two PCS cores were collected at 55.6 and 114.6 mbsf, the deeper one was recovered without pressure. IR scanning and visual observation of cores do not yield any evidence of gas hydrate, consist with the initial interpretation of the Hole U1329A MWD/LWD data. Cores U1329B-1H and Cores U1329C-1H through 4H are Pleistocene gray and dark greenish gray clay. Initial interstitial water analysis indicates the sulfate/methane interface is between ~9.5–12.5 mbsf, coincident with a shallow alkalinity maxima (21.8 mM).