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西准噶尔地区广泛发育晚古生代后碰撞花岗岩,年龄多集中于300Ma左右,在时代上属于晚石炭世,A型花岗岩具有高硅、低铝、富碱、准铝质—弱过铝质、贫钙、低镁,10 000×Ga/Al比值较大,强烈富集高场强元素(HFSE)及Zr、Y、Ga等元素,Sr、Ba强烈亏损,稀土配分模式图呈现典型的右倾“海鸥型”等,并且在A1-A2型花岗岩判别图解显示具有典型的铝质A型的A2型花岗岩特征,表明A型花岗岩可能是年轻地壳(洋壳和岛弧)部分熔融形成的英云闪长—花岗闪长岩质岩浆经进一步分离结晶作用的产物,具备规模成矿的条件。
The late Paleozoic post-collisional granites were widely developed in western Junggar. The age of the granites mainly concentrated in the late Carboniferous in the age of about 300 Ma. The A-type granites are characterized by high Si, Al, Al, Al-poor, , Low magnesium, with a large 10 000 × Ga / Al ratio. HFSE, Zr, Y, Ga and other elements are strongly enriched, while Sr and Ba are strongly depleted. The REE pattern shows a typical right- Type ", etc., and the A1-A2 type granite discrimination diagram shows typical A2 type granite features of aluminum type A, indicating that type A granites may be the Yingyun flash formed by the partial melting of young crust (oceanic crust and island arc) Long - granodiorite magmatic products by further crystallization of the product, with the scale of metallogenic conditions.