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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Experimental evidence for chemo-mechanical coupling during carbon mineralization in ultramafic rocks
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Experimental evidence for chemo-mechanical coupling during carbon mineralization in ultramafic rocks

机译：超空地岩石中碳矿化期间化学机械耦合的实验证据

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Storing carbon dioxide in the subsurface as carbonate minerals has the benefit of long-term stability and immobility. Ultramafic rock formations have been suggested as a potential reservoir for this type of storage due to the availability of cations to react with dissolved carbon dioxide and the fast reaction rates associated with minerals common in ultramafic formations; however, the rapid reactions have the potential to couple with the mechanical and hydraulic behavior of the rocks and little is known about the extent and mechanisms of this coupling. In this study, we argue that the dissolution of primary minerals and the precipitation of secondary minerals along pre-existing fractures in samples lead to reductions in both the apparent Young's modulus and shear strength of aggregates, accompanied by reduction in permeability. Hydrostatic and triaxial deformation experiments were run on dunite samples saturated with de-ionized water and carbon dioxide-rich solutions while stress, strain, permeability and pore fluid chemistry were monitored. Sample microstructures were examined after reaction and deformation using scanning electron microscopy (SEM). The results show that channelized dissolution and carbonate mineral precipitation in the samples saturated with carbon dioxide-rich solutions modify the structure of grain boundaries, leading to the observed reductions in stiffness, strength and permeability. A geochemical model was run to help interpret fluid chemical data, and we find that the apparent reaction rates in our experiments are faster than rates calculated from powder reactors, suggesting mechanically enhanced reaction rates. In conclusion, we find that chemo-mechanical coupling during carbon mineralization in dunites leads to substantial modification of mechanical and hydraulic behavior that needs to be accounted for in future modeling efforts of in situ carbon mineralization projects. (C) 2017 Elsevier B.V. All rights reserved.
机译：将二氧化碳存放在地下作为碳酸盐矿物的额度具有长期稳定性和不动的益处。由于阳离子的可用性与溶解二氧化碳反应以及与超铜形成中常见的矿物质相关的快速反应速率，提出了超微岩层作为这种储存的潜在水库。然而，快速反应具有潜力与岩石的机械和液压行为耦合，并且关于该偶联的程度和机制知之甚少。在这项研究中，我们认为，原生矿物的溶解和次生矿物沿着预先存在的裂缝的样品中的沉淀导致的表观杨氏模量和聚集体的剪切强度都降低，伴随着降低的渗透性。在用去离子水和富含二氧化碳的溶液饱和的Dunite样品上运行静水压和三轴变形实验，同时监测应力，应变，渗透率和孔隙流体化学。使用扫描电子显微镜（SEM）在反应和变形后检查样品微结构。结果表明，用富含二氧化碳溶液饱和的样品中的通道化溶解和碳酸矿物沉淀改变了晶界的结构，导致观察到的刚度，强度和渗透性的降低。运行地球化学模型以帮助解释流体化学数据，并发现我们实验中的表观反应速率比由粉末反应器计算的速率更快，表明机械增强的反应速率。总之，我们发现，Dunites中碳矿化期间的化学机械耦合导致了在原位碳矿化项目的未来建模努力中需要考虑的机械和液压行为的大量改变。 （c）2017年Elsevier B.V.保留所有权利。

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