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三类火成岩中的金云母具扇形环带构造.底面扇形(001)和侧面扇形(010)已得到较好的解释.对大致等时的生长点进行成分分析表明,不同方向的扇形结构之间存在一定的化学成分差异,(010)扇形较(001)扇形更富Si而贫Ti、Fe、Al、Ba.在每一种扇形类型中,Fe/(Fe+Mg)比值从核部到边缘不断增加.这样差异在不同岩石类型中的金云母之间存在一定幅度的变化,而且随着云母中四次配位阳离予的显著不同,而呈现系统性的变化.影响这种结晶类型的可能因素可以概括为:生长速率、原始表面的几何形态和熔体的总成分.
The three types of igneous rocks with gold-mica fan-shaped zone structure.The bottom fan (001) and the side fan (010) has been a good explanation.On the isochronous growing point component analysis shows that the fan structure between different directions (010) fan is more Si-rich and lean than Ti, Fe, Al and Ba. In each fan type, the ratio of Fe / (Fe + Mg) Increasing with the difference between the phlogopite mica in different rock types there is a certain degree of change, but also with the mica in four significant differences in the coordination of the cation, showing a systematic change affecting the type of crystal Possible factors can be summarized as: growth rate, the geometry of the original surface and the total composition of the melt.