| 钛闪石的高压结构及其地质意义 |
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| 引用本文： | 祝向平,秦善,韩宝福,刘景,李晓东,巫翔,吴忠华.钛闪石的高压结构及其地质意义[J].岩石学报,2004,20(6):1456-1460. |
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| 作者姓名： | 祝向平 秦善 韩宝福 刘景 李晓东 巫翔 吴忠华 |
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| 作者单位： | 1. 北京大学地质学系,造山带与地壳演化教育部重点实验室,北京,100871
2. 中国科学院高能物理研究所同步辐射实验室,北京,100039 |
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| 基金项目： | 国家自然科学基金项目(40272023、49872078)，自然科学我基金重大项目(10299040)，中国科学院知识创新工程方向性项目(KJCX2-SW-NO3)，国家重大基础研究规划项目(2001CB409802)资助 |
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| 摘 要： | 利用同步辐射EDXD方法和DAc高压技术对采于新疆天山碱性玄武岩地幔捕虏体中的钛闪石进行了原位高压(达25．4GPa)结构研究：在室温下，随着压力的增加，钛闪石的轴长a、b、c被逐渐压缩；当压力为18、9GPa时，钛闪石可能由于“脱水”而导致结构发生相变，此相变应属于可逆的二级相变。结合钛闪石的地质产状，我们认为，钛闪石在上地幔一定深度范围内可以保持稳定，是上地幔中重要的含水矿物相之一，其被携带到地表是一个非常快速的过程，本文的结果对某些含钛矿物的高压行为研究提供了一定的参考。
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| 关 键 词： | 钛闪石 高压 结构 同步辐射 |
| 文章编号： | 1000-0569/2004/020(06)-1456-60 |
| 修稿时间： | 2004年3月10日 |
The high-pressure structure of kaersutite and its geological importance |
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| ZHU XiangPing,QIN Shan HAN BaoFu,LIU Jing,LI XiaoDong,WU Xiang and WU ZhongHua.The high-pressure structure of kaersutite and its geological importance[J].Acta Petrologica Sinica,2004,20(6):1456-1460. |
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| Authors: | ZHU XiangPing QIN Shan HAN BaoFu LIU Jing LI XiaoDong WU Xiang and WU ZhongHua |
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| Institution: | ZHU XiangPing,QIN Shan~ HAN BaoFu~,LIU Jing~,LI XiaoDong~,WU Xiang~ and WU ZhongHua~ . Department of Geology and the Key Laboratory of Orogenic Belts and Crustal Evolution,MOE,Peking University,Beijing,China . Laboratory of Synchrotron Radiation,Institute of High Energy Pltysics,Chinese Academy of Sciences,Beijing,China |
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| Abstract: | The in-situ tigh-pressure structure of natural kaersutite, obtained from the mantle xenolith in alkali basalt of southwestern Tiandhan in Xinjiang, has been studied using synchrotron radiation energy dispersive X-ray diffraction and diamond anvil cell at the pressures up to 25.4 GPa. At room temperature, the lattice constants a. b, c of kaersutite are compressed continuously with increasing pressure and at the pressure of 18.9 GPa, a phase transition occurs probably due to the dehydration. Considering the geological occurrence of kaersutite, the experimental results indicate that kaersutite could be stable with rather a depth in the upper mantle, and it must be a rapid process when kaersulite is brought to the earth's surface. In addition, this research would be potentially helpful for the understanding of high-pressure behaviors of other Ti-bearing minerals. |
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| Keywords: | kaersutite high-pressure structure synchrotron radiation |
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