基于石榴石的变质岩年代学

程昊, 徐乃潇

Garnet Geochronology of Metamorphic Rocks

Hao Cheng, Naixiao Xu

图1 衰变常数的不确定性对不同定年体系年龄的影响 （a）衰变常数误差对定年结果的影响[λ147Sm=(6.54±0.05)×10-12 a-1 (1σ)[24]， λ176Lu=(1.867±0.008)×10-11 a-1 (1σ）[30,31]]；（b）黑色部分表示不考虑衰变常数误差影响的年龄值，延长的灰色部分表示加入衰变常数误差后的年龄值（据参考文献［19］修改），前者是2个具有显著性差异的年龄，后者则表现为在误差范围内是一致的2个年龄，据参考文献[21]修改

Fig.1 Errors in age determinations are controlled by uncertainties in decay constants of different isotopic systems (a) Errors in age due solely to uncertainties in the decay constant as a function of time [λ147Sm = (6.54 ± 0.05)×10-12 a-1 (1σ)[24]; λ176Lu = (1.867 ± 0.008)× 10-11 a-1(1σ）[30,31]]; (b) The smaller black bar represents the analytical uncertainty for each age, whereas the larger white bar encompasses the combined analytical and the decay constants uncertainties (conceptually modified after reference［19］). In this case, although the analyses agree poorly within analytical uncertainties (black), they agree well when the day constants uncertainties are considered (gray), modified after reference[21]