| 碱性长石Al—Si有序化进程中微结构和^29Si NMR谱的表现 |
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| 引用本文： | 薛纪越,周玲棣.碱性长石Al—Si有序化进程中微结构和^29Si NMR谱的表现[J].矿物学报,1998,18(3):261-267. |
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| 作者姓名： | 薛纪越 周玲棣 |
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| 作者单位： | [1]南京大学地球科学系和现代分析测试中心 [2]中国科学院广州地球化学研究所 |
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| 基金项目： | 95～96年度南京大学固体微结构国家重点实验室基金，国家自然科学基金!49472096 |
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| 摘 要： | 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射像，在另外三个样品中，都见到芦席状结构，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
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| 关 键 词： | 碱性长石 微结构 核磁共振谱 铝 硅 有序化 |
MICROSTRUCTURES AND ~(29)Si NMR SPCTRA OF ALKALINE FELDSPARS IN Al-Si ORDERING |
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| Xue Jiyue, Cai Yuanfeng, Zhao Xiaoning.MICROSTRUCTURES AND ~(29)Si NMR SPCTRA OF ALKALINE FELDSPARS IN Al-Si ORDERING[J].Acta Mineralogica Sinica,1998,18(3):261-267. |
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| Authors: | Xue Jiyue Cai Yuanfeng Zhao Xiaoning |
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| Abstract: | Al occupancy in T1o site for six natural alkaline feldspars was determined by means of Xray powder diffraction. Their T1o values range from 0. 28 to 0. 79. Two high sanidines with the T1o values of 0. 28 and 0. 31 respectively show modulation structure, but it cannot be recorded because it is very much sensitive to electron beam. For three of the alkaline feldspar samples the tweed texture mixing with M twin can be seen by the TEM method. The width of the twin lamellae increases with increasing T1o value. No microstructure can be seen with the TEM method for one of the samples occurring in nepheline syenite. The 29Si MAS NMR spectra of all the samples change regularly. That is to say, the spectra with two peaks tend to evolve into three narrow peaks with increasing T1o value. |
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| Keywords: | alkaline feldspar Al-Si ordering microstructure ~(29)Si NMR spectrum |
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