Abstract: Abstract: The Dongsu granite series has high? Juan SiO2 and Alkali? Juan rich Features and the pulsating or that has been various component units show DISTINCT surging intrusive contact relationships. However, neither major element nor trace element geochemical characteristics can be explained by a simple model of magmatic origin. Based on the geological, petrological and geochemical characteristics, it is believed that magma originated from the granulite? Juan FACIES lower Crust. The relict mineral assemblage in the provenance contains plagioclase but no garnet or amphibole. The early? Juan the formed Mangnai Tolgoi unit is likely to Be related to K? The Juan Feldspar cumulationView, The Hanayinhada Unit contains Mantle? Juan derived Components, the Hanayinhada and Tamugate units have the Features of the comagmatic Evolution and the last? Juan the formed Wulanhada unit may be the product of emplacement of magma at the deeper level.