Petrogenesis of the Helong Granites in Southern Jiangxi Province, China: Constraints from Geochemistry and In Situ Analyses of Zircon U–Pb–Hf Isotopes

The Jinzhuping and Changkeng granites are related to the Helong W–Sn ore field in southern Jiangxi Province, China. Three different phases can be found pluton, their LA-ICP-MS zircon U–Pb ages 155.2 ± 0.68 Ma, 154.0 0.56 153.4 0.99 respectively, indicating two types of granitic rocks. All have similar geochemical characteristics, they high contents SiO2 (73.99 wt.%–77.68 wt.%), total alkali (7.56 wt.%–8.76 wt.%) weakly strongly peraluminous. They slightly enriched HREE depleted Eu, Ba, Sr, P, Ti. Zircon εHf(t) values three from −14.4 −10.4, −15.3 −11.4, −18.1 −10.5, Hf TDM model range 1.83 2.06 Ga, 1.89 2.14 2.31 respectively. Whole-rock geochemistry isotope analysis indicate that experienced a degree differentiation evolution derived by partial melting Late Paleoproterozoic crustal materials, formed backarc caused low-angle subduction Paleopacific plate.