Coupled Chemical and Physical Processes and Their Influence on Ridge-Flank Hydrothermal Systems: A Pilot Study of Idealized Silica Diagenesis

耦合化学和物理过程及其对脊侧热液系统的影响：理想化二氧化硅成岩作用的初步研究

• 批准号: 9504546
• 负责人: Charles Wheat
• 金额: $ 6.78万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9504546&HistoricalAwards=false
• 关键词: Coupled; Chemical; Physical; Processes; Their

9504546 Wheat Cold sea water circulates deep into the ocean crust, is heated, exchanges chemical constituents with the crust, and then emerges as heated hydrothermal water. This process has a profound effect on the composition of the ocean crust and sea water. Presently much attention is focused on the hydrothermal water exiting from hot vents at ridge crests, but a large proportion of the water exits through sediments on the ridge flanks. The proponents argue that the physical, chemical, and mineralogical characteristics of the ridge flank environment has been characterized much better than the ridge crest environment because the flanks are much more accessible by drilling than ridge crests. The research plan is to understand the fluid flow up from basalt basement through the sediment by porous flow and diffusion, and to determine what are the chemical changes in the fluid and the chemical and mineralogical changes in the sediments. This will be done as a pilot study with existing computer models that will generate chemical profiles based on boundary conditions of temperature, fluid flow, and initial physical conditions of the sediment. Results will be compared to chemical profiles found in four sedimented areas. ***

小行星9504546 冷海水循环进入海洋地壳深处，被加热，与地壳交换化学成分，然后作为加热的热液水出现。 这一过程对洋壳和海水的组成有着深远的影响。 目前，人们的注意力主要集中在从海脊顶部热喷口流出的热液，但大部分水通过海脊侧翼的沉积物流出。 支持者认为，脊侧翼环境的物理、化学和矿物学特征比脊顶环境好得多，因为侧翼比脊顶更容易通过钻探到达。 研究计划是了解流体从玄武岩基底通过多孔流动和扩散通过沉积物向上流动，并确定流体中的化学变化以及沉积物中的化学和矿物学变化。 这将作为一项试点研究，利用现有的计算机模型，根据温度、流体流动和沉积物的初始物理条件的边界条件生成化学剖面图。 结果将与在四个沉积区发现的化学剖面进行比较。 ***