共查询到4条相似文献,搜索用时 0 毫秒
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对江西赣南6个地区风化淋滤型稀土矿中全风化层的粘土矿物进行了研究,为进一步了解粘土矿物对该类型稀土矿中稀土元素分异的影响奠定了基础。X射线衍射自然定向片、甲酰胺片、饱和乙二醇片和加热片、红外光谱及扫描电镜观察结果表明该区粘土矿物以片状高岭石和针管状7埃洛石为主,其中坳背塘、长坑屋、上堡、杨村样品主体为高岭石,足洞样品中发育大量埃洛石,而石排样品中高岭石与埃洛石比例相当。电感耦合等离子体质谱分析表明稀土元素在粘土矿物中大量富集,其稀土元素配分不仅受到原岩的影响,而且受到粘土矿物本身性质的影响。Ce元素在足洞和石排样品的粘土矿物中表现出正异常,而在其他样品粘土矿物中表现为负异常,可能与其中发育的埃洛石密切相关。Ce元素可能以方铈矿胶膜的形式包裹在针状埃洛石中,和/或以离子形式被选择性吸附于埃洛石表面。 相似文献
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A. M. Awadalla 《Geotechnical and Geological Engineering》1990,8(4):319-331
Summary The effect of thermally induced stress on fractured granite is considered, using mathematics to solve an engineering problem that includes: (1) physical information translated into a mathematical form; (2) a mathematical model proposing a solution of the problem and (3) interpretation of the solution in physical terms.This procedure, applied to an engineering problem demonstrates that theory and its physical applications are related. 相似文献
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Microbial induced calcite precipitation (MICP) has been well studied to date in the laboratory as a viable alternative soil improvement technique that harnesses a natural bacterial process to induce cementation. Specifically, MICP utilizes the microbial process of hydrolysis of urea to induce pH increase leading to calcite precipitation. The study presented herein demonstrates the utility of a simple bio-geochemical reactive transport model to predict MICP in one-dimensional column experiments. The mathematical model was originally developed in the framework of the TOUGHREACT code to include kinetically controlled reaction rates for urea hydrolysis and calcite precipitation. Inverse modeling, via UCODE-2005, is utilized to calibrate and verify the model to experimental data including aqueous and mineral chemistry. Results indicate good agreement between data and simulated results for capturing the trends and magnitudes of a variety of MICP treatment schemes in half meter, one-dimensional flow columns. A design procedure is presented for predicting MICP in one-dimensional flow by sequentially coupling UCODE-2005 with TOUGHREACT. 相似文献