TO: Tom Davies

FM: Jay Miller


JA Daily Science Report for Expedition 305, 12 February 2005.


SCIENCE UPDATE: Cores 305-U1309D-225R to -228R (1082.4 to 1101.6 mbsf, 85% recovery) include medium- to coarse-grained gabbro and olivine gabbro. The last two cores recovered from this bit run (Cores 305-U1309D-227R and -228R, 1092 to 1101 mbsf) include a sharp igneous contact with an ~7 m thick interval of olivine-rich troctolite (commonly 80-90% olivine). This interval has a distinct, heterogeneously distributed, anastomosing serpentine foliation, however, locally the intensity of serpentinization is as low as 10%-20%.