TO: Tom Davies
FM: Jay Miller
JA Daily Science Report for Expedition 305, 26 January 2005.
SCIENCE UPDATE: Cores 305-U1309D-143R to -151R (703.0 to 746.20 mbsf, 73% recovery) are varitextured, medium- to coarse-grained gabbro without strong magmatic fabric. Patches and thin intervals (few tens of cm) of olivine-bearing to troctolitic gabbro occur throughout the cored interval. Core 305-U1309D-146R (~718 mbsf) recovered a 1 m thick, deformed oxide gabbro. The lower part of the cored interval (interleaved medium coarse to coarse-grained gabbro) is intersected by 1 cm thick, subvertical carbonate veins. Overall alteration is slight to moderate, more intense in halos around fractures.