【摘要】 通过国内外花岗岩体的207对角闪石-黑云母40Ar-39Ar年龄(tAr)与锆石U-Pb年龄(tZr)之间差值(Δt=tZr-tAr)进行的频数统计分析表明:Δt呈对称正态分布(偏度系数CSK==-0.193;峰度系数CKU=16.9);年龄差(Δt)既呈正值又有负值,其众数值为0.40Ma,均值为0.45Ma。采用最小二乘法计算,花岗岩体锆石U-Pb年龄与花岗岩角闪石-黑云母40Ar-39Ar年龄拟合出相关系数很高(R=0.995)、回归系数接近l(0.997 7)的线性回归方程(tAr=0.997 7×tZr+0.004 5)。这些统计特征表明,从总体来看,花岗岩角闪石-黑云母40Ar-39Ar定年测定结果与锆石U-Pb定年测定结果是一致的,也不存在"花岗岩角闪石40Ar-39Ar年龄>黑云母40Ar-39Ar年龄"的规律。更多还原

【Abstract】 The frequency statistics analysis is conducted for 207 pairs of difference values Δt between the hornblend-biotite40Ar-39 Ar ages(tAr) and zircon U-Pb ages(tZr) of granite plutons at home and abroad,the result indicates that theΔt(Δt=tZr-tAr) display a symmetrical normal distribution(skewness coefficient CSK=-0.193;kurtosis coefficient CKU=16.9) in the histogram,the Δt are both positive and negative with a mode of 0.40 Ma and a mean of 0.45 Ma.Using least squares regression procedure,a best liner regression equation(tAr=0.997 7×tZr+0.004 5) with high correlation coefficient(R=0.995) and regression coefficient(closed ito 1) is fitted for zircon U-Pb ages(tZr) and hornblend-biotite40Ar-39Ar ages(tAr) of granite plutons.These statistical analysis characteristics indicate that the hornblend-biotite40Ar-39Ar dating results are corresponding with zircon U-Pb dating results for granites,and there seams no a regularity of hornblende40Ar-39 Ar dating ages>biotite40Ar39Ar dating ages.更多还原