Organic geochemistry of two sediment cores from the Kara Sea

Within the Russian-German research project on "Siberian River Run-off (SIRRO)" devoted to the freshwater discharge and its influence on biological, geochemical, and geological processes in the Kara Sea, sedimentological and organic-geochemical investigations were carried-out on two well-dated sediment cores from the Yenisei Estuary area. The main goal of this study was to quantify the terrigenous organic carbon accumulation based on biomarker and bulk accumulation rate data, and its relationship to Yenisei river discharge and climate change through Holocene times. The biomarker data at both cores clearly indicate the predominance of terrigenous organic matter, reaching 70 to 100% and 50 to 80% of the total organic carbon within and directly north of the estuary, respectively. During the last about 9 Cal. kyrs. […]

在“西伯利亚河流径流（SIRRO）”这一俄德联合研究项目中，该研究专注于卡拉海的淡水资源排放及其对生物、地球化学和地质过程的影响。在该项目中，对来自叶尼塞河三角洲区域的两个年代明确的沉积岩心进行了沉积学和有机地球化学调查。本研究的主要目标是基于生物标志物和总积累率数据，量化陆源有机碳的积累量，并探讨其与叶尼塞河径流以及全新世时期气候变化之间的关系。两个岩心的生物标志物数据清晰地表明，陆源有机物质在三角洲及其北部区域的总有机碳中占主导地位，分别达到70%至100%和50%至80%。在过去的约9个千年前，……