单颗粒锆石不同束斑LA-ICP-MS原位微区U-Pb年龄对比测定及其应用研究-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

单颗粒锆石不同束斑LA-ICP-MS原位微区U-Pb年龄对比测定及其应用研究

Contrastive analysis comparative of single zircon in situ U-Pb age by LA-ICP-MS with different beam spots

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DOI	10.20086/j.cnki.yskw.2025.4060
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(2)
作者	孟重天，郝宇杰*，李予晋，王世昌，任枫荻，张宇婷，商青青，张峻硕，李泽宇，罗炜丞,
作者单位	1. 吉林大学地球科学学院, 吉林长春 130061; 2. 自然资源部东北亚矿产资源评价重点实验室, 吉林长春 130026
摘要	在前人研究基础上,利用激光剥蚀电感耦合等离子质谱(LA-ICP-MS)锆石U-Pb定年方法,通过进一步改进测试流程、优化仪器参数及增加氮气等辅助气体增敏设备,最大程度提升小束斑LA-ICP-MS中的灵敏度并降低元素分馏效应。对此,本文对Qinghu、Plešovice、Tanz 3个标准锆石在束斑直径分别为32 μm、24 μm和16 μm条件下进行了定年研究。实验结果显示:在32 μm小束斑条件下,标准锆石Qinghu的²⁰⁶Pb/²³⁸U的年龄范围为162~157 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为159.5±0.8 Ma (2σ,n=26,MSWD=0.36);标准锆石Plešovice的²⁰⁶Pb/²³⁸U的年龄范围为340~334 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为337.1±1.5 Ma (2σ,n=27,MSWD=0.085);标准锆石Tanz的²⁰⁶Pb/²³⁸U的年龄范围为574~562 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为566.6±2.9 Ma (2σ,n=29,MSWD=0.070)。在24 μm小束斑条件下,标准锆石Qinghu的²⁰⁶Pb/²³⁸U的年龄范围为162~157 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为159.3±0.7 Ma (2σ,n=30,MSWD=0.22);标准锆石Plešovice的²⁰⁶Pb/²³⁸U年龄范围为341~334 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为337.2±1.5 Ma (2σ,n=29,MSWD=0.13);标准锆石Tanz的²⁰⁶Pb/²³⁸U年龄范围为568~561 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为566.5±2.9 Ma (2σ,n=30,MSWD=0.054)。在16 μm小束斑条件下,标准锆石Qinghu的²⁰⁶Pb/²³⁸U年龄范围为163~154 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为159.5±1.4 Ma (2σ,n=25,MSWD=0.45);标准锆石Plešovice的²⁰⁶Pb/²³⁸U年龄范围为340~334 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为337.3±2.0 Ma (2σ,n=30,MSWD=0.063);标准锆石Tanz的²⁰⁶Pb/²³⁸U年龄范围为575~563 Ma,²⁰⁶Pb/²³⁸U加权平均年龄为567.0±4.3 Ma (2σ,n=30,MSWD=0.028)。以上结果表明,Qinghu、Plešovice、Tanz 3个标准锆石加权平均年龄与推荐值在误差范围内完全吻合。因此,文中尝试建立的小束斑(24 μm及16 μm)锆石LA-ICP-MS U-Pb定年新方法具有可行性。该方法的建立有利于扩大LA-ICP-MS锆石U-Pb定年的应用范围,对颗粒较小、结构复杂的锆石颗粒进行定年分析,具有重要的理论研究意义与经济价值。
Abstract	Building on previous research, we employed laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating method to maximize sensitivity and minimize elemental fractionation effects. This was achieved by improving the testing process, optimizing the instrument parameters, and incorporating auxiliary gas sensitization equipment, such as nitrogen. In this study, three standard zircons—Qinghu, Plešovice, and Tanz—were dated using beam spot diameters of 32, 24, and 16 μm, respectively. The experimental results reveal that with a 32 μm beam spot, standard zircon Qinghu ²⁰⁶Pb/²³⁸U age range is 162~157 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 159.5±0.8 Ma (2σ, n= 6, MSWD=0.36); Standard zircon Plešovice ²⁰⁶Pb/²³⁸U age range is 340~334 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 337.1±1.5 Ma (2σ, n=27, MSWD=0.085); Standard zircon Tanz ²⁰⁶Pb/²³⁸U age range is between 574~562 Ma, weighted average ²⁰⁶Pb/²³⁸U age 566.6±2.9 Ma (2σ, n=29, MSWD=0.070). With a 24 μm beam spot, standard zircon Qinghu ²⁰⁶Pb/²³⁸U age range is 162~157 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 159.3±0.7 Ma (2σ, n=30, MSWD=0.22); Standard zircon Plešovice ²⁰⁶Pb/²³⁸U age range is 341~334 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 337.2±1.5 Ma (2σ, n=29, MSWD=0.13); Standard zircon Tanz ²⁰⁶Pb/²³⁸U age range is 568~561 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 566.5±2.9 Ma (2σ, n=30, MSWD=0.054). With a 16 μm beam spot, standard zircon Qinghu ²⁰⁶Pb/²³⁸U age range is 163~154 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 159.5±1.4 Ma (2σ, n=25, MSWD=0.45); Standard zircon Plešovice ²⁰⁶Pb/²³⁸U age range is 340~334 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 337.3±2.0 Ma (2σ, n=30, MSWD=0.063); Standard zircon Tanz ²⁰⁶Pb/²³⁸U age range is 575~563 Ma, weighted average ²⁰⁶Pb/²³⁸U age is 567.0 ±4.3 Ma (2σ, n=30, MSWD=0.028). The weighted average ages of the three standard zircons (Qinghu, Plešovice, and Tanz) are consistent with their recommended values within the margin of error. These findings demonstrate the feasibility of using small beam spot sizes (24 μm and 16 μm) for zircon LA-ICP-MS U-Pb dating. This refined method extends the applicability of LA-ICP-MS zircon U-Pb dating, making it suitable for small zircon grains with complex structures. This model has significant theoretical research implications and economic value.
关键词	激光剥蚀电感耦合等离子体质谱仪(LA-ICP-MS)；小束斑；锆石U-Pb定年
KeyWord	laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS); small laser beam spot; zircon U-Pb dating
基金项目
页码	473-489

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孟重天，郝宇杰*，李予晋，王世昌，任枫荻，张宇婷，商青青，张峻硕，李泽宇，罗炜丞. 单颗粒锆石不同束斑LA-ICP-MS原位微区U-Pb年龄对比测定及其应用研究 [J]. 岩石矿物学杂志. 2025; 44; (2). 473 - 489.

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