To assess the paleoceanographic potential of Leg 186 sediments, we investigated Quaternary calcareous nannofossil flora at Sites 1150 and 1151 in the Japan Trench. Because of the frequent occurrence of barren intervals and the lack of oxygen isotope data, a detailed paleoceanography is not feasible for these cores. We limited our study to the upper 26.07 m of the section from Hole 1150A and the upper 21.01 m of the section from Hole 1151C. The studied samples from Cores 186-1150A-1H through 3H are younger than 0.085 Ma. Core 186-1151C-1H (upper 1.92 meters below seafloor [mbsf]) is younger than 0.085 Ma, and samples between 2H-7, 5-7 cm, and 3H-CC, 5-7 cm, (9.99-21.01 mbsf) are older than 0.245 Ma and younger than 0.408 Ma.
1Hagino, K., and Okada, H., 2003. Data report: Late Quarternary calcareous nannofossils from the northwestern Pacific Ocean, Holes 1150A and 1151C, Leg 186. In Suyehiro, K., Sacks, I.S., Acton, G.D., and Oda, M. (Eds.), Proc. ODP, Sci. Results, 186 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/186_SR/108/108.htm>. [Cited YYYY-MM-DD]
2Research Fellow of the Japan Society for the Promotion of Science, Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-Ku, Nagoya 464-8602, Japan. hagino@geobio.eps.nagoya-u.ac.jp
3Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo N10 W8, 060-0810, Japan.
Initial receipt: 2 January 2002
Acceptance: 7 August 2002
Web publication:
3 March 2003
Ms 186SR-108