제주도 하논분화구에서 육원성 알칸과 유기물의 탄소 동위원소 기록: 과거 3만5천년동안 고식생과 고기후변화의 함의

Abstract

Carbon isotope of total carbon (&#61540 13CTOC), long-chain n-alkanes and their compound-specific carbon isotope ratios (&#61540 13CALK) were investigated in the Hanon paleo-Maar sediment, Jeju Island of Korea to understand paleovegetationchanges and their paleoclimate linkages. Based on the organic geochemical data (TOC (%), TN(%) and their &#61540 13CTOC and&#61472 &#61540 15NTN ), the core column stratigraphy was divided into three units from bottom to 12.5 ka (UnitI),12.5 ~2.5 ka (Unit II) and 2.5 ka to core tope (Unit III), respectively. In particular, &#61540 13CTOC showed marked fluctuation from -17.31‰ to -28.68‰, suggesting different organic carbon sources.ionchanges and their paleoclimate linkages. Based on the organic geochemical data (TOC (%), TN(%) and their &#61540 13CTOC and&#61472 &#61540 15NTN ), the core column stratigraphy was divided into three units from bottom to 12.5 ka (UnitI),12.5 ~2.5 ka (Unit II) and 2.5 ka to core tope (Unit III), respectively. In particular, &#61540 13CTOC showed marked fluctuation from -17.31‰ to -28.68‰, suggesting different organic carbon sources.