Mechanisms of Organic Matter Preservation in Marine Sediments: A Focus on Oxygen Sensitive Organic Matter

对冲(OCE-9711690)摘要对冲OCE-9711690海洋科学的一个主要感兴趣的领域是海洋沉积物中有机质的分布和保存。PI一直是该领域研究的关键贡献者，他建议继续研究海洋沉积物中有机物的形态、分布和保存。这项建议的一个主要目的是确定不同程度降解的沉积有机混合物的主要生物化学成分的变化。新的分析技术将应用于现有的沉积物样品，这些样品将被选择性地提取有机碳。因此，除了整体表征外，还将添加13C核磁共振分析，以提供更详细的有机成分数据。这项研究的结果有望揭开海洋沉积物中有机质保存的两个基本问题，即1)氧敏感性如何与沉积物中有机质的保护性吸附有关；2)氧敏感性有机物在多大程度上可以直接从耐水解生物大分子中获得。

Hedges (OCE-9711690) ABSTRACT Hedges OCE-9711690 A major area of interest in marine sciences is the distribution and preservation of organic matter in marine sediments. The PI has been a key contributor to studies in this area, and he proposes to continue his research on the forms, distributions and preservation of organic matter in marine sediments. A major aim of this proposal is to identify shifts in the major biochemical compositions of sedimentary organic mixtures subjected to varying extents of degradation. New analytical techniques would be brought to bear on existing sediment samples which would be selectively extracted for organic carbon. Thus in addition to bulk characterizations, analyses by 13C NMR would be added to provide more detailed organic compositional data. Results from this study would be expected to unravel the two fundamental issues in the preservation of organic matter in marine sediments, namely 1) how oxygen-sensitivity relates to protective sorption of organic matter in sediments and 2) to what extent oxygen- sensitive organic matter might be directly derived from hydrolysis-resistant biomacromolecues.