Collaborative Research: Geochemical Consequences of Extensive Gas Hydrate Formation in Sediments of the Cascadia Accfetionaly Prism

合作研究：卡斯卡迪亚棱镜沉积物中大量气体水合物形成的地球化学后果

• 批准号: 9731157
• 负责人: Marta Torres
• 金额: $ 37.27万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9731157&HistoricalAwards=false
• 关键词: Collaborative; Research; Geochemical; Consequences; Extensive

9731157 Torres To quantify the exchange of fluids and dissolved constituents from the Cascadia margin hydrate field to the overlying water column a multi-investigator program is designed to measure this exchange under a variety of conditions within the Cascadia region. A 2-year field program will deploy benthic devices that sample fluid discharge. Gravity, push and multicores will be used to assess how near-surface formation and decomposition of a mixed CH4-H2S hydrate in continental margin sediments influences benthic fluxes and early diagenetic reactions. The data collected during the first year will be used to assess the spatial variations of constituent release from the hydrate field, variations that are likely to be most significant at active venting sites. These results will 1) identify ideal sites for temporal variability studies to be conducted during two subsequent visits to the area, and 2) define the length and number of deployments in the following field programs. The different environments present in the Cascadia margin, along with the spatial-temporal experimental design will enable assessment of the effect of widespread hydrate formation in the Cascadia margin on element mobilization, transport, and release at the seafloor. This knowledge has applications for broader issues on a global scale, as hydrate geochemistry is of significant relevance in global carbon budgets, climate change models, sediment slope stability, and energy resource issues.

9731157 Torres 为了量化从卡斯卡迪亚边缘水合物田到上覆水柱的流体和溶解成分的交换，设计了一个多研究者程序来测量卡斯卡迪亚地区内各种条件下的这种交换。 一项为期两年的实地计划将部署对排放物进行采样的海底装置。 重力、推力和多核将用于评估大陆边缘沉积物中混合 CH4-H2S 水合物的近地表形成和分解如何影响底栖通量和早期成岩反应。 第一年收集的数据将用于评估水合物田成分释放的空间变化，这些变化可能在活跃的喷口地点最为显着。 这些结果将 1) 确定在随后两次访问该地区期间进行时间变异性研究的理想地点，以及 2) 确定以下实地计划中部署的长度和数量。 卡斯卡迪亚边缘存在的不同环境以及时空实验设计将能够评估卡斯卡迪亚边缘广泛的水合物形成对海底元素动员、运输和释放的影响。 这些知识可应用于全球范围内更广泛的问题，因为水合物地球化学在全球碳预算、气候变化模型、沉积物坡度稳定性和能源资源问题中具有重要意义。