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| Evolution of Quartz C-axis Pole Figures during Dynamic Recrystallization ： ウィキペディア英語版 |
Evolution of Quartz C-axis Pole Figures during Dynamic Recrystallization
Quartz is a very common crustal mineral that undergoes crystal plastic deformation over a wide range of conditions, and there are many descriptions of its deformation microstructures and crystallographic preferred orientation (CPO) from a wide variety of metamorphic grades, strain geometries and finite strains. From both the experiments and simulations, it is possible to obtain information from the fabrics that develop during deformation histories. For example, in progressive simple shear the fabric skeleton becomes asymmetric relative to the sense of shear. The fabric orientation and characteristics are controlled by the kinematic framework and bear only an indirect relationship to the finite strain accumulated to that point in the history.〔
The c-axis pole figure evolves from a broad peripheral maximum indicative of basal slip, to an inclined single girdle with two maxima indicative of rhomb slip, and finally an elongate single maximum at the girdle center indicative of prism slip; throuthout this sequence the fabric skeleton rotates with the sense of shear.
==Quartz structure==
Quartz is made up of SiO4 with an atoms frame of silicon–oxygen tetrahedra. Each oxygen is shared between two tetrahedra, giving an overall formula of SiO2. Quartz is part of the trigonal crystal system which is a subsystem of the hexagonal crystal system. As shown in the figure, quartz has four axes: a1=a2=a3≠c. The a-axes lie in a plane at a 120°angle from each other and the c-axis is perpendicular to the plane of a-axes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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