| Pb、Sr和REE在矿物中的扩散补偿关系及其对扩散系数的预测 |
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| 引用本文： | 赵子福,郑永飞.Pb、Sr和REE在矿物中的扩散补偿关系及其对扩散系数的预测[J].岩石学报,2001,17(1):69-94. |
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| 作者姓名： | 赵子福 郑永飞 |
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| 作者单位： | 中国科学技术大学地球和空间科学系, |
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| 基金项目： | 国家自然科学基金(编号:40033010)和中国科学院知识创新工程项目(KZCX2-07)资助成果. |
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| 摘 要： | 对现有实验扩散数据的检查发现，不仅Pb、Sr和REE元素在不同矿物中存在着扩散补偿关系，不同元素在同一矿物或同族矿物中也满足扩散补偿关系。阴离子孔隙度作为矿物内部离子堆积密度的一种量度，它与Pb和REE扩散活化能之间存在负的线性相关性，在固定温度下与Sr扩散系数（lnDT)之间呈正的线性相关，因而可以用于预测元素在矿物中的扩散系数。本文分别采用离子孔隙度法和双补偿法预测了Pb、Sr和REE在不同矿物中的扩散系数，这些结果与已有的实验数据在实验误差范围内是一致的，因此可以应用到与扩散有关的地球化学动力学研究中。
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| 关 键 词： | 补偿效应 离子孔隙度法 双补偿法 稀土元素 铅同位素 锶同位素 REE元素 矿物 扩散系数 |
| 修稿时间： | 2000年8月21日 |
Lead, strontium and REE diffusion compensatio n and estimation of their diffusivity in minerals. |
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| ZHAO ZiFu and ZHENG YongFei.Lead, strontium and REE diffusion compensatio n and estimation of their diffusivity in minerals.[J].Acta Petrologica Sinica,2001,17(1):69-94. |
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| Authors: | ZHAO ZiFu and ZHENG YongFei |
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| Institution: | ZHAO ZiFu and ZHENG YongFei. Department of Earth and Space Science,University of Science and Technology of Chin,Hefei,China |
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| Abstract: | Inspection of available experimental diffusion data shows compensation effect which not only occurs in Pb, Sr and REE diffusion in different minerals, but also occurs in the different elements of the same mineral or the same mineral groups. For Pb and REE diffusion, there exist linear correlations between anion porosity and activation energy; which for Sr diffusion, there exist linear correlations between anion porosity and diffusion coefficients at some temperatures. As a measure of atomic packing density in minerals, anion porosity can thus be used to predict element diffusion coefficients. This paper predicts lead, strontium and REE diffusivity in minerals by anion porosity and bi compensation methods, respectively. The empirical results are consistent with known experimental data and thus applicable to studies of geochemical kinetics. |
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| Keywords: | Diffusion Compensation effect Ionic porosity method Bi-compensation method Lead Strontium Rare earth element |
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