JA Daily Science Report for Expedition 312, 26 November 2005


LOCATION: Site 1256


SCIENCE UPDATE: Cores 186R to 188R recovered 3.42 m of basalt from 1319.5 to 1333.9 mbsf (23.7%). Our pace of advance remains below 1 m/hr (0.7 m/hr) but recovery has improved providing several oriented pieces as the grain size increases. The rocks are moderately altered microcrystalline to cryptocrystalline basalts. Pyroxene displays moderate pervasive replacement by chlorite and actinolite. Alteration halos adjacent to vein margins are less distinct than in cores above and grade into the moderately altered groundmass. Veins commonly have near vertical orientations but conjugate vein sets are also observed.