Two Types of Calcium Alkaline Granite and Their Tectonic-Metallogenic Significance in North Margin of Eastern Junggar

Based on the predecessor study on the granite chronology and geochemistry in eastern Junggar,we divide the calcium alkaline granite of the study area into two types:one is calcium alkaline granite for subduction,the other is high-kalium calcium alkaline for post collision.By contrastively studying the rock geochemistry characteristics of the granitic rock,we found that there are systematic differences between the two kinds of calcium alkaline granite,and at the same time they have similarity.Rock geochemistry characteristics indicate that calcium alkaline for subduction is consistent with island-arc magma,high-kalium calcium alkaline for post collision is relevant with post collision plutonism.The similarity explains that evolution is characteristic with quick conversion from subduction to collision,same spatial location in orogenic belt and duple magma source from the series of calcium alkaline for subduction to high-kalium calcium alkaline for post collision.Diverse tectonic setting of calcium alkaline granite indicates that granite is restricted by different evolutionary backgrounds in orgenic belt.Island-arc and post-collision setting is relevant with calcium alkaline for subduction and high-kalium calcium alkaline for post collision respectively.Adakite magmatic affinity show calcium alkaline for subduction and high-kalium calcium alkaline for post collision partly have capacities of formed porphyry deposits in different backgrounds.The spatial relationship between high-kalium calcium alkaline for post collision and IOCG deposit display stretched post collision setting of orgenic belt is tectonic background of IOCG deposit possibly.Multiplicity of tectonic environment explained primarily the tectonic setting differences between Kalaxiangeer with porphyry mineralization and Laoshankou SE belt with IOCG mineralization.