| Citation: | Hongming Cai, Hongfei Zhang, Wangchun Xu. U-Pb Zircon Ages, Geochemical and Sr-Nd-Hf Isotopic Compositions of Granitoids in Western Songpan-Garze Fold Belt: Petrogenesis and Implication for Tectonic Evolution. Journal of Earth Science, 2009, 20(4): 681-698. doi: 10.1007/s12583-009-0054-8
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Granitoids are widespread in the Songpan-Garze (松潘-甘孜) fold belt, western China. These granitoids provide insight into regional tectono-magmatic events, basement nature and tectonic evolution. However, previous studies mainly focused on the eastern Songpan-Garze fold belt. In this article, five granitoid intrusions from the western Songpan-Garze fold belt have been studied. These intrusions are composed of quartz-diorite and granodiorite. Using LA-ICP-MS zircon dating method, the obtained magma crystallization ages are 219±2 Ma for the quartz-diorite and 216±5 Ma for the granodiorite. The ages, combined with regional geological analyses, show that they formed in a post-collisional tectonic setting. The quartz-diorite and granodiorite display co-linear variation in their chemical compositions. REE compositions for both the quartz-diorite and granodiorite show strongly fractionated patterns with (La/Yb)N=5.02–18.34 and Eu/Eu*=0.44–0.89. The quartz-diorites have initial 87Sr/86Sr ratios (
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