TO: Tom Davies

FM: Jay Miller


JA Daily Science Report for Expedition 304, 8 December 2004.


LOCATION:  Site U1309 (prospectus site AMFW-01A)

Latitude: 30° 10.120'N     Longitude: 42° 07.114'W    
Water depth: 1645 mbsl


SCIENCE UPDATE: Cores 304-U1309D-9R to -15R (55.3 to 89.0 mbsf, 62% recovery, average recovery for Hole U1309D is 61%) are a complex, interleaved series of gabbro, troctolite, and diabase. The coarse-grained intervals in places exhibit a steeply dipping, high-temperature, foliated and lineated mylonitic fabric. Serpentinized peridotite was recovered from approximately the same depth (~60 mbsf) as in Hole U1309B showing a sharp upper contact with gabbro. No lower contact was recovered, and subsequent cores yielded another sequence of moderately altered diabase and gabbro, with rare, thin intrusive intervals of aphyric basalt.