JA Daily Science Report for Expedition 309, 29 July 2005


LOCATION: Site 1256


SCIENCE UPDATE: Cores 104R to 107R recovered 3.27 m of basalts from 940.8 to 958.8 mbsf (18.2%). Penetration rates continue to average ~1 m/hr. The rocks are cryptocrystalline to fine grained, aphyric to sparsely phyric, basalt sheet flows separated locally by chilled or glassy margins. Vertical fractures filled with green phyllosilicates and silica minerals are common. At 1600 the bit had accumulated 52.8 hrs so the pipe was tripped for a bit change. The science party met to discuss the results and observations made in the first 30 cores (75R to 105R) recovered on Expedition 309.