Hydrothermal Sediment Alteration at Oceanic Spreading Centers: A Comparison of Thermogenic Organic Reactions in Laboratory and Natural Systems

海洋扩散中心的热液沉积物变化：实验室和自然系统中生热有机反应的比较

• 批准号: 9116537
• 负责人: Jeffrey Seewald
• 金额: $ 24.33万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-12-15 至 1995-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116537&HistoricalAwards=false
• 关键词: Hydrothermal; Sediment; Alteration; Oceanic; Spreading

Hydrothermal alteration of organic matter in sediments overlying oceanic spreading centers such as the Guaymas Basin (Gulf of California), Escanaba Trough (Gorda Ridge), and Middle Valley (northern Juan de Fuca ridge) results in the generation of significant organically derived alteration products. Hydothermal experiments will be conducted in the laboratory at 200-400oC and 300 bars to constrain better factors that regulate the generation and stability of organic compounds and the extent and nature of organic-inorganic interactions. Experiments containing natural sediments and seawater type fluids or varying composition will allow detailed quantitative characterization of organic alteration products as a function of time, temperature, and sediment and fluid composition, and identity sources and sinks for these species in natural hydrothermal systems. The sediment alteration experiments will be used to calibrate paleogeothermometers based on the relative abundance and distribution of thermally altered organic species for use in ridge crest hydrothermal systems. The results of this study will be applied to natural environments to evaluate geochemical conditions during hydrothermal sediment alteration and to constrain the time-temperature history of sediment-covered spreading centers.

上覆沉积物中有机质的热液蚀变 海洋扩张中心，如瓜伊马斯盆地（墨西哥湾 加州）、埃斯卡诺巴海槽（戈尔达海脊）和中谷 （北方胡安德富卡山脊）的结果，在一代 重要的有机衍生改造产品。 水热的 实验将在200- 400 oC的实验室中进行， 300条限制更好的因素，调节发电 有机化合物的稳定性， 有机-无机相互作用 含有天然 沉积物和海水类型的流体或不同的成分将 允许有机蚀变的详细定量表征 作为时间、温度、沉积物和流体的函数的产物 组成，并确定这些物种的源和汇， 天然热液系统 沉积物蚀变实验 将用于校准古地质温度计的基础上， 热蚀变有机质的相对丰度和分布 在脊顶热液系统中使用的物种。 结果 将本研究的成果应用于自然环境中， 热液沉积物蚀变的地球化学条件 限制沉积物覆盖的时间-温度历史 扩散中心