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%.