摘要
在多年研究岩石显微结构和构造的基础上 ,总结了所带 4届博士和硕士研究生的研究数据 ,认识到翡翠的质量与动力变质作用有密切的关系。脆性变形的碎裂结构使翡翠质量变次 ,而韧性变形的糜棱结构使质量变好。在较低温度、较强剪切应力和高应变速率下的韧性变形 ,通过位错滑动、亚晶粒化和动态重结晶使硬玉晶粒变细、镶嵌紧密 ,即各种空隙被很好地填补 ,透明度增大 ,质地变得更细腻。在强大剪切应力和钠质流体的共同作用下 ,铬铁矿的淡化作用是形成绿色的主要原因。剪切应力还控制翡翠绿色色相和绿色空间的分布。绿色一般分布在韧性变形区的中心部位 ,高应力区有利于铬的富集。
Jadeite is the queen of jade. In the past, the study about this topic is concentrated in identification, composition and its trade. especially in studing the ‘B goods’ until recently, there are only few study in the generation and mechanism of jadeite which is a very important topic.The authors have attempted to shed light on reliving above the problem by microtexture and microstucture methods and summarize the research data made by our four doctor and master students. The results have demonstrated that the dynamic metamorphism has close relationship with jadeite quality. Cataclastic texture which came from brittle deformation made the jadeite quality bed, but the mylonitic texture which resulted from ductile deformation made the jadeite quality good. Under the condition of the low temperature, strong shear stress and high strain velocity, through the dislocation glide, sub grain and dynamic recrystallization, the ductile deformation made the jadeite grain fined, the crystal close mosaic, the different pores fill and the transparency good. The green jadeite was formed mainly as a result of the desalination of chromite.In general, the green color is distributed in the center place of ductile deformation area, the high stress is of great advantage to the concentration of chrome.
出处
《桂林工学院学报》
2001年第1期1-5,T001,T002,共7页
Journal of Guilin University of Technology
