| 高温高压下岩石部分熔融及熔体形态学研究 | |
| Alternative Title | The Studies on the Partially melting of Rock and the Morphology of Melt under High Temperature and High |
| 郑小刚 | |
| 2007-05-30 | |
| Degree Grantor | 中国科学院地球化学研究所 |
| Place of Conferral | 地球化学研究所 |
| Degree Name | 博士 |
| Keyword | 熔体形态学 二面角 高温高压 部分熔融 斜长角闪岩 |
| Abstract | 熔体形态学作为现代岩石学的前沿领域之一，其主要研究矿物颗粒之间熔体形态特征、连通性以及与周围矿物的相互作用关系。该学科在我国还不被广大地学工作者所熟悉。本论文以斜长角闪岩为初始物料，在850-1100℃和2.0-4.0 GPa条件下，进行了岩石的部分熔融实验，并对作为实验产物的熔体进行了形态学方面的研究。同时就目前形态学研究的基础理论和实验方法作了初步介绍。 利用YJ－3000吨六面顶高压装置，我们以天然的块状斜长角闪岩为样品，在高温高压条件下进行了斜长角闪岩的脱水部分熔融实验，测量了熔体与矿物相接触时所形成的二面角。结果表明： 1、熔体的形态分布与熔融程度具有明显依赖关系，当熔融程度小于5%时，熔体被矿物颗粒分隔开来，以熔块的形式相互独立；当熔融程度大于5%时，薄膜状或管状熔体沿矿物颗粒边缘形成一个相互连通的熔融网络。 2、当熔体相互隔离时，二面角平均值大于60°；当熔体相互连通时，二面角平均值小于60°。在熔体相互连通的测量实验中，英安质和安山质成分的熔体与石榴子石的二面角分布在56－58°之间，与单斜辉石的二面角分布在50－53°之间。 3、根据界面化学理论推导表面张力和界面能的最小化是推动熔体连通的两个驱动力。 4、二面角大小受体系温度、压力及物质组成等物理化学条件的影响，随着温度升高，固－液界面的表面张力减弱，二面角减小，熔体越容易相互连通。 5、通过对二面角的原位测量，不仅可以判断熔体的相互连通性，还能反演熔体的熔融过程。 |
| Other Abstract | As one of the front-line fields of modern petrology, melt morphology mainly researches the morphological character and connectivity melt of mineral grains, and the relationship between mineral grains and neighboring minerals. This subject hasn’t been familiar to many geochemists in China. In the thesis, amphibolite was used as parent material and the experiment of partially melting amphibolite was performed at 2.0~4.0GPa 850~1100℃. The morphology study of the melt, part of the experimental product, was conducted. Furthermore, the basic theories and empirical approaches of morphology research are introduced in the thesis. Using YJ-3000 t cubic anvil high pressure apparatus, we did the experiments on the dehydrating partially melting of amphibolite's melt through sampling the lumps of natural amphibolite under high temperature and high pressure. We also measured the dihedral angle's value between melts and mineral surfaces. The results showed that： 1. There is obviously dependency relationship between the distributions of melts’ form and the degree of melting. When the degree of melting is less than 5%, melts will be separated by the mineral kernels and will be mutually independent in the form of fusion cake; when it’s more than 5%, the film-shaped or tube-shaped melts will form a mutually connected melting network along the edges of mineral kernels. 2. When the melts are mutually separated, the average values the dihedral angle are more than 60°；and when they are mutually connected, the average values are less than 60°. In the experiment of measuring melts’ mutual connection, the dihedral angle's distribution between the garnet and the melts of dacite and andesite is among 56-58°, and the dihedral angle's distribution between the clinopyxene and the melts of dacite and andesite is among 50-53°. 3. The dihedral angle of melts will be reduced with the diminishment of solid liquid interface’s surface tension and interfacial energy. The minimum of the surface tension and interfacial energy are two driving forces to promote the connection of melts. 4. The dihedral angle’s value is influenced by some physical and chemical situations like systemic temperature, pressure and physical components. With the rise of temperature, the surface tension of the interface between the solid and liquid will abate and its dihedral angle will minish, and the melts mutual connection will become easier. 5. Through the in-situ measurement of the dihedral angle, we not only can judge the melts’ mutual connectivity, but also can return the melting process of melts. |
| Pages | 53 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/3242 |
| Collection | 研究生_研究生_学位论文 |
| Recommended Citation GB/T 7714 | 郑小刚. 高温高压下岩石部分熔融及熔体形态学研究[D]. 地球化学研究所. 中国科学院地球化学研究所,2007. |
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