Kalang rock is mainly composed of gray in the coarse grain of Altay Orogenic Belt.Using LA-ICP-MS U-Pb dating,the age of (410.542.1) Ma(MSWD=0.28) represents the crystallized age of the kalang granite are Lower Devonian.The rock is characterized by high contents of SiO2,Al2O3,alkali,low magnesium and it is showing that the kalang rock is rich in light rare earth,but LREE and HREE are high degree of fractionation.Meanwhile,it has obvious negative K,P,Ti,Sr anomalies,positive Th,La,Nd anomalies and Eu negative anomalies,it is Suggested that source area has rich calcic plagioclase,ilmenite and residues of apatite while some mantle substance are mixed in them.The kalang rock exhibits relatively obvious negative Nd anomalies(εNd(t)=-4.78～-4.02) and Older two-phase model (T2DM) age (1.1～1.2 Ga) which indicate its source area may have material in proterozoic.Kalang granitic pluton formed in the subduction environment provides a new basis for the altay orogenic.%中阿勒泰构造带卡郎岩体主要由灰白色粗中粒花岗闪长岩组成,LA-ICP-MS锆石U-Pb年龄(410.5士2.1) Ma(MSWD=0.28),为早泥盆世.岩石具高SiO2、A12O3、富碱、贫镁特征,轻稀土富集,轻重稀土分馏程度较高,具明显的K,P,Ti,Sr负异常,Th,La,Nd正异常和Eu负异常特征,暗示岩体源区有富钙斜长石、钛铁矿及磷灰石残留,同时幔源物质有一定混入;具负的εNd(t)(-4.78～4.02)和较老的两阶段模式年龄(T2DM)(1.1～1.2Ga),表明其源区可能存在中元古代物质;形成于俯冲环境的卡郎岩体花岗岩,为阿尔泰地区岩体形成环境提供新的依据.
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