Accumulation of particulate organic carbon at the Eurasian continental margin during late Quaternary times

Data on the amount and composition of organic carbon were determined in sediment cores from the Kara and Laptev Sea continental margin, representing oxygen isotope stages 1-6. The characterization of organic matter is based on hydrogen index (HI) values, n-alkanes and maceral composition, indicating the predominance of terrigenous organic matter through space and time. The variations in the amount and composition of organic carbon are mainly influenced by changes in fluvial sediment supply, Atlantic water inflow, and continental ice sheets. During oxygen isotope stage (OIS) 6, high organic carbon contents in sediments from the Laptev Sea and western East Siberian Sea continental margin were probably caused by the increased glacial erosion and further transport in the eastward-flowing boundary current along the continental margin. […]

在卡拉海和拉普捷夫海大陆边缘的沉积岩心中，对有机碳的含量和组成进行了测定，这些岩心代表了氧同位素阶段1至6。有机质的表征基于氢指数（HI）、正构烷烃和显微组分组成，这表明陆源有机质在空间和时间上的主导地位。有机碳含量和组成的变异性主要受河流沉积物供应、大西洋水流入和大陆冰盖变化的影响。在氧同位素阶段6期间，拉普捷夫海和西西伯利亚海大陆边缘沉积物中的高有机碳含量可能是由于冰川侵蚀增强以及沿大陆边缘向东流动的边界流中进一步输送的结果。