Zircon U-Pb chronologic evidence for magma mixing in the Weiya ore district, Xinjiang

Abstract：Lithological, mineral chemical and lithogeochemical characteristics of K-feldspar granite in the Weiya V-Ti-magnetite ore district in eastern Xinjiang as well as the enclaves (diorite) and field geological features of this granite suggest a product of magma mixing. This paper obtained zircon U-Pb ages of (247.5±5.3) Ma and (244.8±1.8) Ma from the K-feldspar granite and its mafic microgranular enclaves of diorite, which are in accord with the age of (244.7±3.3) Ma from the quartz monzodiorite within the error limits. The dating result provides the evidence for magma mixing origin of K-feldspar granite and its enclaves from the viewpoint of chronology.