TO: Tom Davies
FM: Jay Miller
JA Daily Science Report for Expedition 305, 18 February 2005.
SCIENCE UPDATE: Cores 305-U1309D-262R to -268R (1259.1 to 1292.7 mbsf, 69% recovery) are medium- to coarse-grained, gabbro, oxide gabbro, and olivine gabbro. Many of the recovered pieces are small and contacts between lithologies are not commonly preserved, but the general proportions of gabbro, oxide gabbro, and olivine gabbro are 3:1:1, respectively. Many gabbroic intervals are olivine-bearing, and olivine abundance increases down section. Evidence of deformation is low, and alteration is variable but generally low to moderate.