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2 石榴石Sm-Nd方法的开创性应用 （a）全岩—石榴石核/边Sm-Nd等时线，据参考文献[58]修改；(b) 单颗粒石榴石钻取得的12个石榴石样本Sm-Nd等时线； (c) 不同年龄与石榴石半径和体积关系图，指示快速幕式生长，据参考文献[8]修改

Fig.2 A pioneering application of the garnet Sm-Nd method (a) Sm-Nd isochron diagram for Whole-Rock (WR)-garnet core and matrix-garnet rim pairs from a graphite-free metapelite, modified after reference [58]; (b) Isochron diagram for 12 concentric zones in a single garnet showing the corresponding drilled annuli, the differences in isotope ratios relative to the composition of the rim are shown in the lower diagram; (c) Ages of different zones within a garnet plotted as a function of radius and volume with indications of rapid growth episodes, modified after reference [8]