5:36 PM - 5:39 PM
[MIS24-P08] Paleoenvironmental change elucidated from the total organic carbon concentration and stable isotope from Mogami trough
3-min talk in an oral session
Keywords:Paleoenvironmental change, Quaternary, Japan sea, organic carbon, stable isotope
The high TOC concentration during middle to late Holocene suggests high biological productivity in the sea surface. The contribution of marine organic matter to TOC was increasing with sea level rising, suggesting the decreasing trend of C/N ratio and increasing trend of δ13C value during 6.0~9.8 ka, and then becoming current oceanological condition at 6.0 ca. In the last deglaciation, the rapid increasing TOC concentration and δ13C value suggest increasing marine biological productivity. In the last glacial maxima, the marine biological productivity was very low and the contribution of terrestrial organic matter increased but the inflow was very little, according to the lowest TOC concentration and δ13C value.This study is a part of a develooment methane hydrate project, Ministry of Economy, Trade and Industry.