Mineral-fluid reactions in metamorphism and carbon sequestration

变质作用和碳封存中的矿物流体反应

• 批准号: RGPIN-2015-05036
• 负责人: Dipple, Gregory
• 金额: $ 4.37万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=613318
• 关键词: Mineral; fluid; reactions; metamorphism; carbon

This project will assess the role of mineral fluid reactions in modulating fluid flow in Earth’s deep crust and in absorbing the greenhouse gas carbon dioxide from the atmosphere. Fluid flow at depth within Earth's crust may control how the crust behaves during mountain building and magmatism. Fluid flow is also essential for the formation of some metallic and high-tech industrial mineral ore deposits, and influences rock behaviour during deformation (e.g., earthquake events). A critical control on fluid flow is the formation and destruction of permeable pathways by mineral reactions and rock deformation. Likewise, mineral reactions can contribute towards the long term sequestration of carbon dioxide from the atmosphere. One promising area of application is in using industrial waste, such as mine tailings, to capture and bind carbon dioxide for millennia, thus contributing to the mitigation of the climate change problem. This project will determine the mechanisms and rates by which permeable pathways are created and destroyed in specific geologic settings. This will be accomplished by examining rocks from field areas in British Columbia and Oman, and by developing new computer models for fluid flow and reaction at geologic conditions and timescales. These studies will contribute fundamentally to our understanding of the mechanical and chemical coupling of fluid flow, rock deformation, and mineral reaction; processes that are ubiquitous within Earth's crust and are particularly important during ore genesis and seismic events. We will also examine geologic analogues to mine-based greenhouse gas sequestration operations to better understand the controls and consequences of mineral fluid reactions over long time scales (thousands of years). The value of studying natural analogues is that they allow us to assess the long term stability of stored carbon but also typically yield new insights into processes that have not been observed to operate at laboratory conditions. This project will focus on understanding what controls the precipitation of the mineral magnesite, which forms at low temperature in nature but has to date been nigh impossible to replicate in the lab at room temperature. With insights from studying natural analogs, we will seek to accelerate the formation of magnesite in industrial carbon sequestration systems to yield more efficient and safer carbon storage.

该项目将评估矿物流体反应在调节地壳深部流体流动和从大气中吸收温室气体二氧化碳方面的作用。地壳深处的流体流动可以控制地壳在造山和岩浆活动期间的行为。流体流动对于某些金属和高科技工业矿物矿床的形成也是必不可少的，并且在变形（例如地震事件）期间影响岩石的行为。流体流动的一个关键控制因素是矿物反应和岩石变形对渗透通道的形成和破坏。同样，矿物反应也有助于从大气中长期封存二氧化碳。一个有希望的应用领域是利用工业废料，如矿山尾矿，捕获和结合二氧化碳达千年之久，从而有助于缓解气候变化问题。