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

被引:10
作者
赵子福
郑永飞
机构
[1] 中国科学技术大学地球和空间科学系
[2] 中国科学技术大学地球和空间科学系 合肥
[3] 合肥
关键词
扩散; 补偿效应; 离子孔隙度法; 双补偿法; Pb同位素; Sr同位素; 稀土元素;
D O I
暂无
中图分类号
P597 [同位素地质学与地质年代学];
学科分类号
070902 ;
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 (ln DT)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。
引用
收藏
页码:69 / 94
页数:26
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