JA Daily Science Report for Expedition 309, 05 August 2005


LOCATION: Site 1256


SCIENCE UPDATE: A new CC-9 RCB Bit (#6) was installed and Hole 1256D was re-entered for the seventh time on Expedition 309 at 0951. Coring resumed at 1051.3 and progressed to 1060.9 mbsf with recovery of 2.43 m of basalts in Cores 127R and 128R (25.3%). The rocks are aphyric cryptocrystalline-microcrystalline, slightly altered dark grey basalt sheet flows. Some pieces are volcanic breccias containing cryptocrystalline clasts and altered glass cemented by silica, green phyllosilicates, and sulfides. Chilled and glassy margins continue to be present, indicating an eruptive as opposed to intrusive emplacement of these lavas.