烧绿石超族矿物的非晶质化及水的性质研究
发布时间：2018-10-22 15:55
【摘要】：烧绿石超族矿物由于出现不同程度的非晶质化现象,给该类矿物的鉴定和命名带来了困难;另一方面,水也是烧绿石超族矿物的重要成分之一,水的含量和结构形式对其定名起到关键作用。因此对烧绿石超族矿物进行非晶质的成因及晶化过程研究以及水的结构形式研究有重要的意义。烧绿石超族矿物非晶质化产生的原因主要与这些矿物中含有较高放射性元素(U、Th、TR等)导致的辐射损伤有关,其烧绿石超族矿物结构特殊性和类质同像取代的复杂性使其出现空位导致的晶格不稳定性也可能是造成矿物非晶质化的原因之一。为了解决矿物的非晶质化特性在衍射研究中的困难,本次结合镜下挑选、扫描电镜、电子探针及显微硬度测试等实验,对三种典型的非晶质烧绿石超族矿物进行了加热实验研究。通过控制速率来改变加热时长和降温梯度,实验结果表明加热时长和温度梯度的变化对非晶质矿物重结晶有重要的影响。对最终加热的样品进行的X射线衍射研究显示,热处理使矿物的晶体结构得到了不同程度的恢复,这对该类矿物的化学试计算和定名提供了资料。四川冕宁县牦牛坪矿床中发现的烧绿石族矿物,经电子探针鉴定其为富铅且含水的烧绿石,但水的类型的确定一直是个难题,本文采用红外光谱和差热分析,通过一系列加热实验研究,较好的解决了该含水的铅烧绿石矿物中水的类型,实验证实该矿中的水为结晶水,因此定名为水铅烧绿石。
[Abstract]:It is difficult to identify and name this kind of mineral because of the phenomenon of amorphous in different degree. On the other hand, water is also one of the important components of the minerals of burning green Shi Chao group. The content and structure of water play a key role in naming it. Therefore, it is of great significance to study the formation and crystallization process of amorphous and the structure of water. The cause of amorphous formation of burned green Shi Chao group minerals is mainly related to the radiation damage caused by the higher radioactive elements (Uth TR, etc.) in these minerals. The structural particularity of its burning green Shi Chao group and the complexity of the substitution of the same image make it possible that the lattice instability caused by the vacancy is also one of the reasons for the amorphous mineral. In order to solve the problem of the amorphous properties of minerals in the study of diffraction, the experiments such as scanning electron microscope, electron probe and microhardness testing were carried out under the microscope. Three typical amorphous burned green Shi Chao group minerals were studied by heating experiments. The experimental results show that the change of heating length and temperature gradient has an important effect on recrystallization of amorphous minerals. The X-ray diffraction study of the final heated samples shows that the crystal structure of the minerals is restored to varying degrees by heat treatment, which provides data for the chemical trial calculation and designation of the minerals. The pyrochlore group minerals found in Yangniuping deposit, Mianning County, Sichuan Province, were identified by electron probe as lead-rich and water-rich pyrochlore, but the determination of water type has always been a difficult problem. In this paper, infrared spectroscopy and differential thermal analysis are used. Through a series of heating experiments, the type of water in the water-bearing lead pyrochlore mineral is well solved. The experiment proves that the water in the ore is crystalline water, so it is called water lead pyrochlore.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P578.492
本文编号：2287614
[Abstract]:It is difficult to identify and name this kind of mineral because of the phenomenon of amorphous in different degree. On the other hand, water is also one of the important components of the minerals of burning green Shi Chao group. The content and structure of water play a key role in naming it. Therefore, it is of great significance to study the formation and crystallization process of amorphous and the structure of water. The cause of amorphous formation of burned green Shi Chao group minerals is mainly related to the radiation damage caused by the higher radioactive elements (Uth TR, etc.) in these minerals. The structural particularity of its burning green Shi Chao group and the complexity of the substitution of the same image make it possible that the lattice instability caused by the vacancy is also one of the reasons for the amorphous mineral. In order to solve the problem of the amorphous properties of minerals in the study of diffraction, the experiments such as scanning electron microscope, electron probe and microhardness testing were carried out under the microscope. Three typical amorphous burned green Shi Chao group minerals were studied by heating experiments. The experimental results show that the change of heating length and temperature gradient has an important effect on recrystallization of amorphous minerals. The X-ray diffraction study of the final heated samples shows that the crystal structure of the minerals is restored to varying degrees by heat treatment, which provides data for the chemical trial calculation and designation of the minerals. The pyrochlore group minerals found in Yangniuping deposit, Mianning County, Sichuan Province, were identified by electron probe as lead-rich and water-rich pyrochlore, but the determination of water type has always been a difficult problem. In this paper, infrared spectroscopy and differential thermal analysis are used. Through a series of heating experiments, the type of water in the water-bearing lead pyrochlore mineral is well solved. The experiment proves that the water in the ore is crystalline water, so it is called water lead pyrochlore.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P578.492
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，本文编号：2287614
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