论文部分内容阅读
笔者用X射线粉末衍射技术，对六个天然钾长石中的铝在T1o四面体位置的占位率进行了测定，它们的T1o值从0．28变化到0．79。对它们的透射电子显微镜研究表明，两个T1o为0．28和0．31的高透长石有对电子束异常过敏的调制结构，无法记录到它们的衍衬像。在另外三个样品中，都见到了芦席状结构，并夹杂着具一定宽度的片晶组成的格子双晶。片晶宽度随T1o的变大而增加。而在产于一个霞石正长岩中的正长石中没有观察到任何微结构。六个样品的29SiMASNMR谱随T1o值由小变大的变化规律是：随T1o值增大，29Si谱由两个峰变为宽阔重叠的三个峰，再变为分裂明显的三个峰。
The author used X-ray powder diffraction techniques to determine the occupancy of aluminum in the six native potassium feldspar at T1o tetrahedra positions, and their T1o values varied from 0.28 to 0.79. Transmission electron microscopy of them revealed that two high permeability stones with T1o of 0.28 and 0.31 had modulation structures that were anomalous to electron beam anomalies and were unable to record their derivative images. In the other three samples, the alluvial structures were seen and were intermingled with lattice twins composed of platelets of a certain width. The lamella width increases with increasing T1o. No microstructure was observed in the orthoclase produced in a nepheline syenite. The 29SiMASN spectra of six samples change from small to large with the increase of T1o values. As the T1o value increases, the 29Si spectrum changes from two peaks to three broad overlapping peaks and then to three distinct peaks.