A study of zircon U-Pb age and characteristics of Hf isotopes of the Maolin granodiorite in Jingxian County, southern Anhui Province

The Maolin pluton is a superficial intrusive body distributed in Maolin Town of Jingxian County. It is an important part of southern Anhui Mesozoic tectonic-magmatic belt in East China, and the granodiorites are parent rocks of the Tanshulin Mo deposit and Zhanlin Mo deposit in southern Anhui. The main lithologies are granodiorites, granite-porphyry, porphyry granites and monzogranite. The LA-ICP-MS zircon U-Pb data show that these rock bodies were formed at 140.8 ±0.8Ma, the zircon has euhedral and magma ring characteristics, and the dating shows that the diagenetic age of Maolin granodiorite is Early Cretaceous. Zircon Hf isotopic data indicate that the zircon zones in the granodiorite samples are heterogeneous in ε_Hf(t) values (-9.7~-6.2), probably indicating the mixed crust materials during the formation of the magma, with old crustal rocks being the main source.