| 花岗岩锆石U-Pb年龄与全岩Rb-Sr等时线年龄对比研究及其地球化学意义 |
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| 引用本文： | 吴俊奇,章邦桐,凌洪飞,陈培荣.花岗岩锆石U-Pb年龄与全岩Rb-Sr等时线年龄对比研究及其地球化学意义[J].高校地质学报,2007,13(2):272-281. |
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| 作者姓名： | 吴俊奇 章邦桐 凌洪飞 陈培荣 |
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| 作者单位： | 南京大学 内生金属矿床成矿机制研究国家重点实验室及地球科学系， 南京 210093 |
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| 摘 要： | 对国内外32个花岗岩体的锆石U-Pb年龄与全岩Rb-Sr等时线年龄之间差值（Δt）进行的频数统计分析表明：Δt呈对称正态分布（偏度系数CSK=0.36；峰度系数CKU=2.99）；年龄差（Δt）既呈正值又有负值，其均值为2.08Ma；相对年龄差（Rt）小于5%。采用最小二乘法计算，花岗岩体锆石U-Pb年龄（tZr）对全岩Rb-Sr等时线年龄（tRb）拟合出相关系数很高（r=0.998），回归系数接近l（α=1.003）的线性回归方程（tRb =1.003tZr +1.258）。这些统计特征表明，从总体来看，花岗岩体的Rb-Sr等时线定年测定结果与锆石U-Pb定年测定结果是一致的，花岗岩全岩Rb-Sr等时线定年方法是成熟、可信的，同时也为花岗岩锆石U-Pb年龄代表结晶年龄而不代表花岗岩侵位年龄提供了依据。
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| 关 键 词： | 花岗岩锆石U-Pb年龄 花岗岩全岩Rb-Sr等时线年龄 花岗岩侵位年龄 对称正态分布 线性回归方程 |
| 文章编号： | 1006-7493（2007）02-0272-10 |
| 修稿时间： | 2007-03-272007-04-17 |
Comparison between the Zircon U-Pb Ages and the Whole-Rock Rb-Sr Ages of Granite Plutons and Its Geochemical Implication |
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| WU Jun-qi,ZHANG Bang-tong,LIN Hong-fei,CHEN Pei-rong.Comparison between the Zircon U-Pb Ages and the Whole-Rock Rb-Sr Ages of Granite Plutons and Its Geochemical Implication[J].Geological Journal of China Universities,2007,13(2):272-281. |
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| Authors: | WU Jun-qi ZHANG Bang-tong LIN Hong-fei CHEN Pei-rong |
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| Institution: | State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences,Nanjing University, Nanjing 210093, China |
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| Abstract: | The frequency analysis of age difference (Δt) between the results of zircon U-Pb dating and whole rock Rb-Sr dating for 32 granite plutons shows that the Δt displays a symmetrical normal distribution (skewness C sk=0.36; kurtosis C ku=2.99) in the histogram. The Δt is both positive and negative, with a mean of 2.08 Ma, and the percentage of age difference is less than 5% (absolute value). Using least squares regression procedure, a best regression equation with high correlation coefficient (r=0.998) and regression coefficient close to 1 (a=1.003) is fitted to the points of the zircon U-Pb ages and the whole rock Rb-Sr ages for 32 granite plutons. These statistic characteristics indicate that the zircon U-Pb dating ages are corresponding with the whole-rock Rb-Sr isochron ages for granites as a whole. The whole-rock Rb-Sr isochron dating method for granites is mature and reliable. the zircon
U-Pb age cannot represent the emplacement ages of granites, but the crystallization age. |
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| Keywords: | zircon U-Pb age of granite pluton whole-rock Rb-Sr isochron age of granite pluton emplacement age of granite symmetrical normal distribution linear regression equation |
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