TO: Tom Davies

FM: Carlos A. Alvarez Zarikian


JA Daily Science Report for Expedition 306, 29 March 2005.


LOCATION: Site U1313 (IRD3A), Hole U1313A and Hole U1313B



Coring in Hole U1313A concluded at 1045 hrs after recovery of Core 33H at a final depth of 308.2 mbsf and recovery of 103.6%. The cored interval in Hole U1313A is of late Miocene age (~6 Ma) based on nanno- and foraminifer-stratigraphy. Drilling/coring was continued at Hole U1313B, and Cores U1313B-1H to 10H had been recovered by 2325 hrs for a total of 91.4 m of sediment. Sediments in the core catcher from Core U1313B-10H are of late Pliocene age (1.97-2.38 Ma) according to nannostratigraphy.


Cores U1313A-6H to 18H (43.2-166.7 mbsf; Quaternary to early Pliocene) are mainly nannofossil ooze, nannofossil ooze with clay, foraminifer nannofossil ooze, and foraminifer nannofossil ooze with clay of very pale brown (10YR 7/4), light olive gray (5Y 6/2), light gray (2.5 7/1), and white (N9, 5Y 8/1) colors. Below Core U1313A-14H, white (N9) nannofossil ooze is predominant. Two prominent volcanic ash layers occur in Section U1313A-7H-6, 15 cm, and Section U1313A-10H-5, 122 cm, respectively. The Olduvai Normal Polarity Zone was identified in Hole U1313A from  73.7 to 82.2 mbsf.