24. VARIATIONS IN ORGANIC CARBON ISOTOPIC COMPOSITION IN SEDIMENTS AT SITE 1017 DURING THE LAST 25 K.Y.1

Ryoshi Ishiwatari,2 Kohei Matsumoto,2 Osamu Seki,2 and Shuichi Yamamoto3

ABSTRACT

A high-resolution analysis of Hole 1017E revealed that total organic carbon (TOC) concentrations (24.8 ± 2.9 mg/g) and 13C of TOC (-21.3 ± 0.2) in Holocene sections are higher than those in glacial sediments (14.2 ± 4.8 mg/g and -22.1 ± 0.1, respectively). The 306- to 280-cm section has high total sulfur concentrations, which may correspond to anoxia Event 1 (1 of the warm interstadials of GISP2) in the Santa Barbara Basin.

1Lyle, M., Koizumi, I., Richter, C., and Moore, T.C., Jr. (Eds.), 2000. Proc. ODP, Sci. Results, 167 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/167_SR/167sr.htm>. [Cited YYYY-MM-DD]

2Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Minami Ohsawa 1-1, Hachioji, Tokyo 192-03, Japan. Correspondence author: rish@comp.metro-u.ac.jp

3Faculty of Education, Soka University, Tangicho, Hachioji, Tokyo 192, Japan.

Date of initial receipt: 26 October 1998
Date of acceptance: 10 June 1999
Ms 167SR-210

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