Structural and Fluid-Chemical Properties of Active Normal Faults

活动正断层的结构和流体化学性质

• 批准号: 9104677
• 负责人: Ronald Bruhn
• 金额: $ 13.01万
• 依托单位: University of Utah
• 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: 1991-07-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9104677&HistoricalAwards=false
• 关键词: Structural; Fluid; Chemical; Properties; Active

Recent work by the PI's and others has shown that the role of fluids in the deformation of earth's crust is extremely important and yet imperfectly understood. The interaction of fluids with active deformation zones (faults) is a profitable area for research because many of the fault rocks contain evidence, in the form of fluid inclusions, for the physical and chemical conditions that prevailed during faulting. This study will test a general hypothesis that the presence and separation of dissolved CO2 in fault zone fluids plays a crucial role in earthquake generation. Two active normal faults in Utah will be used as test sites for the presence of CO2-rich fluids and paleo-fluid pressure gradients. In addition, the relationship between fault zone structure and fluid channels will be quantified. The results will have major impact and our understanding of fluids in fault initiation and propagation processes and will enhance understanding of earthquake mechanisms.

PI和其他人最近的工作表明， 流体在地壳变形中是极其重要的 但却不完全被理解 流体与 活动变形带（断层）是研究的有利领域 因为许多断层岩都含有证据， 流体包裹体，用于物理和化学条件， 在断层活动中盛行。 这项研究将测试一个一般 假设溶解的二氧化碳的存在和分离， 断层带流体在地震发生中起着至关重要的作用。 犹他州的两个活动正断层将被用作 富CO2流体和古流体压力梯度的存在。 此外，断裂带构造与 流体通道将被量化。 结果将有重大 影响和我们对流体在断层形成中的理解， 传播过程，并将加强对地震的了解 机制等