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开发了利用飞秒激光剥蚀多接收等离子体质谱(fLA-MC-ICPMS)微区原位分析以铜为基体的金属、硅酸盐玻璃及长石等中的铅同位素组成的方法.研究发现中国国家标准物质研究中心研制的以铜为基体的标准样品GBW02137(青铜)中Pb同位素组成均一(208Pb/204Pb=37.9661±0.0005(2 s),207Pb/204Pb=15.5770±0.0002(2 s),206Pb/204Pb=17.7462±0.0002(2 s)),可作为原位微区分析黄铜矿、古钱币等含铜基体样品中Pb同位素组成的外部标准物质和监控样品(QC),为矿床成因研究提供原位微区的Pb同位素地球化学制约,亦可为利用古钱币、青铜器等中的Pb同位素来研究矿料来源、古代工艺、文化交流等.利用本研究建立的方法对NIST(NIST SRM 610,612,614),USGS(BHVO-2G,BCR-2G,GSD-1G)和MPI-DING(GOR132-G,KL2-G,T1-G,StHs60/80-G))标准玻璃中Pb同位素组成进行了准确测定,结果与参考值在2 s误差范围内完全一致.此外,利用本研究的方法对高温炉合成的长石熔融玻璃进行了Pb同位素微区分析,结果与化学法在误差范围内吻合.
Developed a method of in-situ analysis of lead isotope composition in copper-based metals, silicate glass, feldspar and so on by using fLA-MC-ICPMS micro-region analysis with femtosecond laser ablation. The Pb isotopic composition of the copper-based standard GBW02137 (bronze) developed by the National Center for Standardization Research was uniform (208Pb / 204Pb = 37.9661 ± 0.0005 (2s), 207Pb / 204Pb = 15.5770 ± 0.0002 (2s), 206Pb / 204Pb = 17.7462 ± 0.0002 (2 s)), which can be used as in situ microanalysis to analyze Pb isotopic compositions and monitoring samples (QC) of copper-bearing matrix samples such as chalcopyrite and ancient coin. Pb isotopic geochemistry of the micro-area and the use of Pb isotopes in ancient coins, bronzes, etc. to study the sources of mineral resources, ancient crafts, cultural exchange, etc. The NIST (NIST SRM 610, 612, 614) The Pb isotopic composition of standard glasses from USGS (BHVO-2G, BCR-2G, GSD-1G) and MPI-DING (GOR132-G, KL2-G, T1-G, StHs60 / 80-G) And the reference value exactly in the 2 s error range.In addition, the method of this study on the high Synthesis feldspar furnace molten glass microanalysis of Pb isotope, the result was good chemistry within an error range.