Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS21] Gas hydrate in environmental-resource sciences

Tue. May 28, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Hitoshi Tomaru(Department of Earth Sciences, Chiba University), Akihiro Hachikubo(Kitami Institute of Technology), Atsushi Tani(Graduate School of Human Development and Environment, Kobe University), Shusaku Goto(Institute for Geo-Resources and Environment National Institute of Advanced Industrial Science and Technology)

[MIS21-P10] Late Quaternary Total Organic Carbon fluctuation in the eastern Japan Sea and offshore of the Russian maritime provinces

*Yuta Hirano1, Kyousuke Sakamoto1, Naoto Ishida2, Takao Ebinuma2, Koji Seto3, Ryo Matsumoto4 (1.Graduate School of Sustainability Science Methane Hydrate Course ,Tottori University, 2.Tottori Univ., 3.Shimane Univ., 4.Meiji Univ.)

Keywords:Total Organic Carbon, Japan Sea, Late Quaternary, Shallow type methane hydrate

In the Sea of Japan, three cores were taken from the Oki Trough (PC1606), Mogami Trough South (PC1726), and the offshore of the Russian Primorye (Lv81-35GC). Total organic carbon (TOC), total nitrogen (TN), and total sulfur (TS) in sediments were measured from these cores, and the organic carbon concentration and the origin of organic matter were clarified. The organic carbon concentration in the sediment reflects the past primary production. All cores have high correlation between TN and TOC. The value of C/N is from 6 to 10. On the other hand, there is no correlation between TS and TOC. The value of C/S varies from 0.2 to 11. The TOC concentration of PC1726 and Lv81-35GC is almost coincide with PC1606. However, the peak around 10 ka detected in PC1606 is unclear in the other cores. In the period of the Last Glacial Maximum, primary production declined at all areas. However, the subsequent reactions were different in each area.