IODP NanTroSEIZE Stage 1:
Expedition 315: NanTroSEIZE "Megasplay Riser Pilot"
Weekly Report #4
Date 14/Dec/2007
Having left the Site C0001, moved to the new location Site C0002. After deployment of transponders, spud in the Hole C0002B in the morning of 9 Dec. Jetted down to 50 meters below seafloor (mbsf), then started drilling by RCB assembly with center bit. After drilling to 475 mbsf, started coring. Drilled and cored to 1057 mbsf and cut more than 50 cores. Cores are routinely described, measured and sampled by Science Party. Some non-routine measurements for the discrete samples taken from the Hole C0001H cores were also carried out.
At the Hole C0002B, we reached to the base of the Kumano forearc Basin around 920 mbsf, and penetrated into the accretionary prism. The accretionary prism rocks are characterized by scaly fabric and systematic fractures, which has highly different looking from the basin sediments above.
Site Summary Meeting for Site C0001 was held on 8 Dec. End-of-Expedition Meeting was held on 11 Dec. Half of the Science Party left the ship on 13 Dec, and half of the next (Exp 316) Science Party came onboard. They were incorporated into the current work shifts immediately, and cross-over between two Science Parties is going on.
