| 金红石微量元素电子探针分析 |
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| 引用本文： | 王娟,陈意,毛骞,李秋立,马玉光,石永红,宋传中.金红石微量元素电子探针分析[J].岩石学报,2017,33(6):1934-1946. |
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| 作者姓名： | 王娟 陈意 毛骞 李秋立 马玉光 石永红 宋传中 |
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| 作者单位： | 合肥工业大学资源与环境工程学院, 合肥 230009,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;中国科学院青藏高原地球科学卓越创新中心, 北京 100101,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,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,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,合肥工业大学资源与环境工程学院, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009 |
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| 基金项目： | 本文受国家自然科学基金项目（41490614、41272073）资助. |
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| 摘 要： | 金红石电子探针微量元素分析一般以人工合成的氧化物来作为监测标样,尚较缺乏对金红石标样进行系统地测试分析。本文运用CAMECA SXFive电子探针对金红石标样R10进行微量元素分析,根据金红石中主要微量元素在地质学中的应用,本次共分析了Al、Si、Ti、Fe、Cr、Zr、V、Nb、Ta等9个元素,Ti、Si元素作为本次分析的监测元素。本文通过调整加速电压和电流、背景和峰值测试时长以及干扰谱峰处理等来提高微量元素分析精度和准确度。分析结果显示,其中,Zr(780±29×10~(-6))(1SD,n=25)、Nb(2799±66×10~(-6))、V(1276±33×10~(-6))、Fe(4309±34×10~(-6))、Cr(718±31×10~(-6))的分析结果与二次离子质谱(SIMS)和激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)的推荐值在误差范围内一致。大部分元素数据波动范围在10%以内,V、Fe元素的数据波动范围仅在5%以内。V、Nb和Fe测试精度比前人电子探针分析结果有较大提高。金红石Zr测试误差传递给金红石Zr温度计给出的温度误差一般22℃。本文还对金红石Zr温度计应用、提高Ta元素分析精度和准确度、金红石Fe~(3+)分析等问题进行了探讨。
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| 关 键 词： | 金红石 微量元素 电子探针分析 Zr温度计 |
| 收稿时间： | 2016/11/21 0:00:00 |
| 修稿时间： | 2017/2/3 0:00:00 |
Electron microprobe trace element analysis of rutile |
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| WANG Juan,CHEN Yi,MAO Qian,LI QiuLi,MA YuGuang,SHI YongHong and SONG ChuanZhong.Electron microprobe trace element analysis of rutile[J].Acta Petrologica Sinica,2017,33(6):1934-1946. |
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| Authors: | WANG Juan CHEN Yi MAO Qian LI QiuLi MA YuGuang SHI YongHong and SONG ChuanZhong |
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| Institution: | School of Resource and environment Engineering, Hefei University of Technology, Hefei 230009, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese of Academy of Science, Beijing 100029, China;CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese of Academy of Science, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese of Academy of Science, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese of Academy of Science, Beijing 100029, China,School of Resource and environment Engineering, Hefei University of Technology, Hefei 230009, China and School of Resource and environment Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | Synthetic oxides are commonly used as the monitor standards for the trace element analysis of rutile by Electron Probe Microanalyzer (EPMA). Systematic analyses of rutile standards are still lacking. In this study we present a detailed EPMA analysis (CAMECA SXFive) on nine elements (Al, Si, Ti, Fe, Cr, Zr, V, Nb and Ta) in the rutile standard R10. Ti and Si are used as monitor elements. To improve the analytical precision and reduce the detection limit, we have critically adjusted the acceleration voltage, beam current and counting time, and have deducted the interference peak signals. Our results show that the concentrations of Zr (780±29×10-6) (1SD, n=25), Nb (2799±66×10-6), V (1276±33×10-6), Fe (4309±34×10-6) and Cr (718±31×10-6) are well consistent with those analyzed by Secondary Ion Mass Spectrum (SIMS) or Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) within the error range. EPMA analysis in this study exhibits good stability. From a one-month monitoring period, the variations of Nb, Zr, and Cr are within ±10%, whereas the variations of V and Fe are within ±5%. Our modified techniques improved the analytical precisions of V, Nb and Fe in rutile. The analytical precision of Zr in this study would not significantly affect the results yielded by the Zr-in-rutile thermometer. Therefore, EPMA trace element analysis is an effective approach to understand the formation mechanisms of rutile. The techniques that can potentially improve the analytical precisions of Ta and Fe3+ analyses in rutile are also discussed. |
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| Keywords: | Rutile Trace element Electron probe microanalyzer (EPMA) Zr-in-rutile thermometers |
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