地质样品Sr同位素激光原位等离子体质谱(LA-MC-ICP-MS)测定

被引：15

作者：

杨岳衡

吴福元

谢烈文

杨进辉

张艳斌

机构：

[1] 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室

来源：

岩石学报 | 2009年 / 25卷 / 12期

关键词：

Sr同位素; 滨珊瑚; 斜长石; 磷灰石; 钙钛矿; LA-MC-ICP-MS;

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：

Sr同位素在研究岩浆演化及其源区具有重要的示踪作用。MC-ICP-MS的出现为具有高Sr含量地质样品的激光原位Sr同位素测定变成了现实。本文利用Netpune MC-ICP-MS和193nm准分子激光联机,通过滨珊瑚、斜长石、磷灰石和钙钛矿等系列实验,建立了激光原位Sr同位素测定方法。实验结果表明,激光Sr同位素测定中Kr、Rb和稀土元素二价离子的干扰能够有效扣除,而钙聚合物的干扰在Neptune型MC-ICP-MS并不显著。不同激光参数的实验表明,大激光束斑产生更高信号强度,因而Sr同位素精度更高,同一激光束斑大小,激光脉冲频率对Sr同位素精度无明显影响。

引用

页码：3431 / 3441

页数：11

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