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建立了一种利用激光探针等离子体质谱测定单颗粒锆石U-Pb同位素年龄的新方法.以线扫描进样法代替传统的剥深进样法,克服U/Pb之间的熔蚀分异.对前寒武纪(>1.0Ga)锆石的定年表明,~(207)Pb/~(206)Pb、~(206)Pb/~(238)U定年精密度和准确度均为优于2%.对两颗中生代锆石进行了测试,获得了与SHRIMP,定年一致的~(206)Pb/~(238)U年龄.研究结果表明,该定年方法可与SHRIMP定年方法相比拟.
A new method for determining the U-Pb isotopic ages of single-particle zircon by laser probe-based plasma mass spectrometry was established.The method of line-scan injection was used to replace the traditional method of deep-stripping intrusion to overcome the U / Pb corrosion fraction The dating of Precambrian zircons (> 1.0Ga) shows that the precision and accuracy of ~ (207) Pb / 206 Pb and ~ 206 Pb / ~ 238 U dating are all excellent At 2%, two Mesozoic zircons were tested, and the ~ (206) Pb / ~ (238) U age consistent with the SHRIMP dating was obtained.The results show that the dating method can be compared with the SHRIMP dating method.