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Abstract

Electronic copies of this series may be obtained from the Integrated Ocean Drilling Program (IODP) Scientific Publications homepage on the World Wide Web at www.iodp.org/scientificpublications/.

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“…• Hole A: APC to ~200 mbsf with nonmagnetic core barrels and core orientation • Hole B: APC to ~200 mbsf with nonmagnetic core barrels • Hole C: APC/XCB to 758 mbsf with nonmagnetic core barrels • Hole D: APC/XCB to 500 mbsf with nonmagnetic core barrels • Similar to originally proposed Site GOA18-1A (see "Drilling and coring strategy" and Table T3 in Jaeger et al, 2011) Logging program or downhole measurements program:…”

“…Based on the review by the Integrated Ocean Drilling Program (IODP) Environmental Protection and Safety Panel (EPSP) on 29-30 March 2012, Expedition 341 proposed Site GOA18-1A was required to be moved. Site GOA18-1A lay at the crossing lines of seismic Profile MGL1109MCS01, acquired by the R/V Marcus G. Langseth, and seismic Line L-689-13, acquired by the USGS vessel R/V Farnella (Jaeger et al, 2011); however, an amplitude anomaly was visible in the 2011 MGL1109MCS01 profile at this location (Shotpoint 1720). Therefore, the EPSP requested that Site GOA18-1A be replaced with proposed Site GOA18-1B, located at Shotpoint 1748 of multichannel seismic Profile MGL1109MCS01 to avoid an amplitude anomaly.…”

“…• Hole A: APCT-3 (SET if needed) formation temperature measurements • Hole C: wireline logging with triple combo, FMS-sonic, VSI, and magnetic properties tool strings • Similar to originally proposed Site GOA18-1A (see "Drilling and coring strategy" and Table T3 in Jaeger et al, 2011) Nature of rock anticipated: Mud (possibly diatom rich), silt, fine sand, volcanic ash, ice-rafted debris, basalt…”

“…Therefore, the EPSP requested that Site GOA18-1A be replaced with proposed Site GOA18-1B, located at Shotpoint 1748 of multichannel seismic Profile MGL1109MCS01 to avoid an amplitude anomaly. All other aspects of this site, including goals, drilling depths, and priority, are the same as those proposed for Site GOA18-1A (Jaeger et al, 2011).…”

“…This addendum provides the new site summary for Site GOA18-1B, as well as bathymetric and location maps and seismic profiles. The operations strategy and site priorities remain unchanged from the original Expedition 341 Scientific Prospectus (Jaeger et al, 2011). High : -3500…”