Organic geochemistry of ODP Leg 135 sediment samples@en

The average total organic carbon (TOC) content obtained after Rock-Eval/TOC analysis of 156 sediment samples from the eight sites cored during Leg 135 is 0.05%. Hence, the TOC content of Leg 135 sediments is extremely low. The organic matter that is present in these samples is probably mostly reworked and oxidized material. Ten sediment samples were selected for extraction and analysis by gas chromatography and gas chromatography-mass spectrometry. Very low amounts of extractable hydrocarbons were obtained and some aspects of the biomarker distributions suggest that these hydrocarbons are not representative of the organic matter indigenous to the samples. […]对第135航次（Leg 135）取芯获得的8个站位的156件沉积物样品开展Rock-Eval/总有机碳（Total Organic Carbon, TOC）分析后，测得其平均总有机碳含量为0.05%。因此，第135航次沉积物的总有机碳含量极低。该批样品中赋存的有机质大概率以经再改造且氧化的物质为主。本次研究选取10件沉积物样品进行萃取，并通过气相色谱（Gas Chromatography, GC）与气相色谱-质谱联用法（Gas Chromatography-Mass Spectrometry, GC-MS）开展分析。本次得到的可提取烃类含量极低，且生物标志物分布的部分特征表明，此类烃类无法代表样品中原生有机质的组分。[…]