Quantitative Appraisal of Organic Carbon Sources in Marine Sediments

干酪根是海洋中碳的主要储存库 环境 过去分别使用的两种技术， 即快速热解和13 C分析，已被证明可用于 了解干酪根的来源和结构， 复杂的交联大分子。 这项工作将 研究将这些技术结合在新开发的 线系统，以定量确定的种类， 结构亚基存在于干酪根中（通过热解），而在 同时确定海洋和陆地来源的 这些亚基中的有机碳（通过13 C分析）。 辅助技术，如常规Py-GC-MS和 选择性化学降解也将用于 表征干酪根。 预计这项工作将提供 在分析的基础上，今后要解决两个研究 主题，（1）是否大池脂肪碳， 表层沉积物来源于海洋而不是陆地， 新的研究似乎表明，（2）它是否是海洋生物 或者陆地上的碳更容易与 沉积物中的硫化物，形成生物抗性“硫化” 干酪根

Kerogen is the major repository of carbon in the marine environment. Two techniques used separately in the past, namely flash pyrolysis and &13C analysis, have proven useful in understanding the sources and structures of kerogen and other complex cross-linked macromolecules. This work will investigate combining these techniques in newly developed on- line systems to quantitatively determine the kinds of structural subunits present in kerogen (via pyrolysis) while at the same time determining the marine and terrestrial sources of organic carbon in these subunits (via &13C analys is). Ancillary techniques such as conventional Py-GC-MS and selective chemical degradation will also be used to characterize the kerogens. This work is anticipated to provide the analytical basis in the future to address two research topics, (1) whether the large pool of aliphatic carbon in surface sediments has a marine rather than terrestrial origin, as new research seems to suggest, and (2) whether it is marine or terrestrial carbon that is more susceptible to reaction with sulfides in sediments, forming bioresistant "vulcanized" kerogen.