| 多硅白云母中Fe2+的高压有序效应 |
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| 引用本文： | 应育浦,宋仁奎.多硅白云母中Fe2+的高压有序效应[J].地质科学,1995,30(4):355-362. |
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| 作者姓名： | 应育浦 宋仁奎 |
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| 作者单位： | 中国科学院地质研究所 北京 100029 |
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| 摘 要： | 21个多硅白云母来自4个低温高压变质带。用电子探针、X射线粉末衍射及穆斯堡尔谱测定其化学成分、b0值及Fe2+占位。建立Fe2+(M1)/Fe2+(M2)对b0值相关图,发现Fe2+在八面体晶位有序化并解释其有序机理。
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| 关 键 词： | 多硅白云母 b0值 穆斯堡尔谱 Fe2+ 高压有序 |
| 收稿时间： | 1994-11-23 |
| 修稿时间： | 1994-11-23; |
Fe2+ ORDER RESULTING FROM HIGH METAMORPHIC PRESSURE IN PHENGITE |
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| Ying Yupu, Song Renkui ,He Wei.Fe2+ ORDER RESULTING FROM HIGH METAMORPHIC PRESSURE IN PHENGITE[J].Chinese Journal of Geology,1995,30(4):355-362. |
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| Authors: | Ying Yupu Song Renkui He Wei |
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| Institution: | Institute of Geology, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | 21 amples of phengite used for present work were collected from 4 low-temperature and high-pressure metamorphic belts in China. The chemical compositions, b0 value and Fe2+ site occupancy have been measured by means of electron microprobe,X-ray powder diffraction and Mossbauer spectrometer. The ratio, R=Fe2+ (M1)/Fe2+(M2), is used to describe Fe2+ order degree in phengite. b0 vs R diagram has been established, in which there are 3 regions corresponding to low-, medium- and highpressure. This is a new geobarometric indicator. Mechanism of Fe2+ order at M2 site of phengite have been discussed. Progress of Fe2+ order at M2 site of phengite is suggested:high metamorphic pressure→Tschermarks substitution → (1) Si4+ replace tetrahedral Al3+, more Si enter phengite structure, (2) (Mg, Fe) replace Al3+ at M2site, which results in Fe2+ order at M2. |
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| Keywords: | Phengite b0 value" target="_blank">0 value')" href="#">b0 value Mossbauer spectra Fe2+ ordering" target="_blank">2+ ordering')" href="#">Fe2+ ordering |
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