关键词: 中酸性岩体, 微量元素, I型花岗岩, 大陆边缘弧, 喇嘛苏

Abstract: According to the test results of the trace elements content of the fresh samples from intermediate-acid intrusive bodies in Lamasu copper deposit，the average content of Ni is close to the value of Vickers，but the value of Ti，Cr，V is inferior to the value of Vickers.The content of high field strength elements is between 611.25×10-6 and 1 210.11×10^-6 with the average value of 1 031.211×10^-6.The content of large ion lithophile elements is between 1 041.05×10^-6 and 2 708.61×10^-6 with the average value of 1 845.15×10^-6.The content of the elements such as Rb，Ba，K，La，Sm，Th is higher than others，however，the content of the Ta，Nb，Ti is lower.Besides，the content of Th is much higher than Ta.All samples points are located at the area of volcanic arc granite in the tectonic discrimination diagram of non-active elements of porphyry.It is illustrated that，the granitoid in this area is I-type granite of orogenic belt，and belongs to the normal calcium alkaline continental margin arc granitoid.And it is the rock that is generated in subduction zone and comes from the Earth′s crust.The granitoid in this area may be blended by the oceanic crust material and fluid during its forming process and also mixed with surrounding rock as well.

Key words: Intermediate-acid intrusive bodies, Trace element, I-type granite, Continental margin arc, Lamasu