Granitoids in Yuexi of eastern Dabie mountain, China

摘要

A lot of acid intrusions occur in Yuexi and are intruded in the North Dabie metamorphic Complex. They comprise monzogranite-syenogranite, granodiorite-quartz monzodiorite and alkali granite. Petrographical and geochemical study of them indicates they were formed in the post-orogenic regimes. It is worth to mention that an undeformed body of granodiorite-quartz monzodiorite is metaluminous (A/CNK, 0.8-0.9) and exhibits a smaller Eu anomaly (Eu/Sm 0.31). All granitoids in Yuexi district have early Cretaceous ages of emplacement and negative ε_Nd(0)(-17- -26). They are plotted as a horizontal zone on ε_nd(0)-ε_Sr(0) diagram, indicating these granitoids may be derived from a older earth crust.