柯石英-退变质石英-寄主矿物系统的晶体缺陷与水的赋存状态及其关联机制

项目名称： 柯石英-退变质石英-寄主矿物系统的晶体缺陷与水的赋存状态及其关联机制

项目编号： No.41472042

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 孟大维

作者单位： 中国地质大学（武汉）

项目金额： 105万元

中文摘要： 陆壳深俯冲和折返过程中水的含量、赋存状态、运移途径和演化方式, 是当前地学研究的热点和前沿。以天然柯石英-退变质石英-寄主矿物系统中的超微晶体生长缺陷和构造变形缺陷, 结构中水的分布、赋存状态、变质演化特征, 以及矿物缺陷与水之间的相互作用和变质反应关系为研究目标, 以定量高分辨电子显微学、分子光谱学和其它矿物超微区分析技术为研究手段, 在原子分辨尺度原位分析和研究柯石英-退变质石英-寄主矿物系统中的纳米矿物相与晶间界面结构、微晶相变及多形转变、矿物间的衍生和交生、微裂隙的性质及周围晶格缺陷与相变关系、位错亚构造、变形结构等晶体缺陷特征及其变化规律，研究矿物缺陷构造与水、纳米水分子团(H2O)或水分子包体、羟基(OH-)、氢原子的相互关系，以及在超高压变质岩的形成环境和构造演化过程中的作用与意义。为深入认识和理解超高压变质过程中的水-岩相互作用和壳幔物质交换提供微观矿物学制约。

中文关键词： 柯石英-退变质石英-寄主矿物系统；晶体缺陷；结构水；高分辨电子显微学；红外光谱

英文摘要： The content of H2O, its state of occurrence, transportation pathways and the way of evolution during the deep subduction and exhumation of continental crust is the research focus and frontier in geosciences. The ultrafine crystal growth defects and the constructive deformation defects in the coesite - retrograde quartz - host minerals system, the distribution of H2O in structure, state of occurrence, characteristics of metamorphic evolution and the relationship between defects-water interaction and metamorphic reactions are the research object. The quantitative high-resolution electron microscopy, molecular spectroscopy and other analysis technologies on mineral ultramicro zone are chosen as research tools. In coesite - retrograde quartz - host mineral systems, in atomic resolution scale, analyzing and studying the characteristics and variation law of crystal defects, such as the nanoscaled mineral phases and interface structure of intergranulars, phase transformation of microcrystalline structure as well as polymorphous transformation, intergrowth and teterotaxy among minerals, the relationship between the character of microfissure as well as the surrounding lattice defects and phase transformation, strain field, the sub-structure of the dislocations, deformation structure. The relationship between mineral defect structure and water, nanoscaled water molecules groups (H2O) or water molecules inclusions, hydroxyl (OH-), hydrogen atom (H), as well as the role and significance in the process of metamorphic reaction dynamics and tectonic dynamics is studied. This could provide microscopic mineralogy restriction for deeply understanding of the water - rock interaction and the crust-mantle material exchange in the process of ultrahigh pressure metamorphic.

英文关键词： System of coesite-retrograde quartz-host minerals;Crystal defect;Structural water;HRTEM;FTIR