JA Daily Science Report for Expedition 309, 07 August 2005


LOCATION: Site 1256


SCIENCE UPDATE: Cores 133R to 136R recovered 6.97 m of basalts from 1080.1 to 1099.3 mbsf (36.3%). From Section 133R-1 to 135R-2 two massive aphyric microcrystalline basalt flows (Unit 44 and 45) were identified. Hyaloclastite breccia consisting of angular-subrounded microcrystalline-cryptocrystalline basaltic clasts (0.5-4 cm) and altered glass (0.1-1.2 cm) cemented by anhydrite and saponite occurs in Pieces 10 to 14 of Section 135R-1 marking the top of Unit 45. Core 136R retrieved a number of spectacular intrusive contacts with cryptocrystalline to glassy basalt quenched against fine-grained basalt.