| 地质样品Sr同位素激光原位等离子体质谱(LA-MC-ICP-MS)测定 |
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| 引用本文： | 杨岳衡,吴福元,谢烈文,杨进辉,张艳斌.地质样品Sr同位素激光原位等离子体质谱(LA-MC-ICP-MS)测定[J].岩石学报,2009,25(12):3431-3441. |
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| 作者姓名： | 杨岳衡 吴福元 谢烈文 杨进辉 张艳斌 |
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| 作者单位： | 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,北京,100029 |
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| 基金项目： | 国家自然科学基金项目 |
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| 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.
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| 关 键 词： | Sr同位素 滨珊瑚 钭长石 磷灰石 钙钛矿 |
In-situ Sr isotopic measurement of natural geological samples by LA-MC-ICP-MS |
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| YANG YueHeng,WU FuYuan,XIE LieWen,YANG JinHui,ZHANG YanBin.In-situ Sr isotopic measurement of natural geological samples by LA-MC-ICP-MS[J].Acta Petrologica Sinica,2009,25(12):3431-3441. |
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| Authors: | YANG YueHeng WU FuYuan XIE LieWen YANG JinHui ZHANG YanBin |
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| Abstract: | Strontium (Sr) isotopes are important indicators and tracers in deciphering the sources and evolution of magmas. Since the development of multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS), in-situ Sr isotopic analyses in high spatial resolution have become widely available and feasible for minerals with high Sr concentrations. We developed in-situ Sr analytical procedure on Netptune MC-ICP-MS coupled with 193 nm excimer laser, based on systematical analysis of porites coral, plagioclase, apatite and pervoskite. It is shown that the interferences of Kr, Rb and REEs can be reasonably corrected, and that the interferences of Ca argide/dimmer species are limited in our Neptune instrument. Analysis with spot size of 63, 94 and 127μm and different repetition rates shows that the larger pit size produces the higher signal intensity, hence higher precision of Sr isotopic data, however, the repetition rate does not have a significant influence on the precision. |
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| Keywords: | LA-MC-ICP-MS Sr isotopes Porites coral Plagioclase Apatite Perovskite LA-MC-ICP-MS |
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