| 福建平潭培长石的微结构研究 |
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| 引用本文： | 薛纪越,赵晓宁.福建平潭培长石的微结构研究[J].高校地质学报,1999,5(2):170-174. |
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| 作者姓名： | 薛纪越 赵晓宁 |
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| 作者单位： | [1]南京大学地球科学系 [2]南京大学现代分析中心 |
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| 摘 要： | 福建省平潭岛角闪辉长岩中有60％－70％的矿物为培长石（简称平潭培长石），电子探针分析显示其牌号变化在84－88范围内。电子衍射研究表明培长石晶体结构为原始格子，其c和d类衍射漫散，并有拉长现象，且c和d两类衍射相对于a和ｂ类衍射的强度在各个选区有变化。电子显微学研究发现该矿物晶体广泛发育着一种非常细小的调制结构，调制结构延长方向近于平行（010）。钠长石律双晶也是非常常见的现象。此外，此外，在该晶体中广泛存在着由位错发育而成的小角晶界，这些晶界是岩浆期后热渍的通道，并在其问生出层状硅酸盐矿物。作者认为，近于平行(010)的调制是一种成分调制，也就是由富钙和略贫钙的畴区相闻掏成的调制。作为Huaenlocher连晶中的富钙相的培长石（An85-88）实际上已经分解。
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| 关 键 词： | 培长石 调制结构 福建 平潭岛 角闪辉长岩 |
| 收稿时间： | 1999-06-20 |
| 修稿时间： | 1999-06-20 |
STUDY ON THE MICROSTRUCTURE OF PINGTAN BYTOWNITE |
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| Xue Jiyue,Cai Yuanfeng,Zhao Xiaoning.STUDY ON THE MICROSTRUCTURE OF PINGTAN BYTOWNITE[J].Geological Journal of China Universities,1999,5(2):170-174. |
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| Authors: | Xue Jiyue Cai Yuanfeng Zhao Xiaoning |
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| Institution: | 1. Department of Earth Science, Nanjing University, Nanjing 210093; 2. Center of Materials science, Nanjing University, Nanjing |
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| Abstract: | Approximately 60～70％ of the amphibole gabbro in Pingtan Island of Fujian Province is composed of bytownite (Pingtan bytownite). The wavelength dispersive analysis results by means of electron microprobe indicate that the composition of this bytownite ranges from An84 to An86. The SAED shows that the lattice of the Pingtan bytownite is primitive because the a, b, c, d diffractions all appear, but the c and d diffractions are diffuse and elongated along f axis. The relative intensity of c and d diffractions changes with different selected areas. The electron microsoopic research for this crystal shows that there is a sort of modulation structure in very fine scale all over the crysta1. Its elongated direction is nearly parallel to (010). Also the microtwin after albite law is commonly seen. In addition the low angle grain boundaries, which developed from the dislocation arrays, exist widely. These grain boundaries are the channels of the magmatic hydrothermal solution. The phyllosilicate grew within these channels. The cleavages of the phyllosilieates are all parallel to the channels. The genesis of the modulation structure is explained in this paper. It is believed that this is a sort of compositional modulation. As a Ca-rich phase of Huttenlocher intergrowth, the An85～88 bytownite has be en essentially decomposed. |
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| Keywords: | Bytownite Compositional Modulation |
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