通过对东昆北成矿带冰沟南铜镍矿辉长岩的全岩地球化学进行分析，以确定该岩体的岩石成因及其形成的构造环境。冰沟南辉长岩 SiO 2 的含量为 49. 72% ～ 51. 58%，岩石系列为钙碱性。稀土元素球粒陨石分配模式为轻稀土略富集型，δEu 为 1.26 ～ 1. 54，轻微正 Eu 异常。岩石富集大离子亲石元素 (LILE) Rb、Ba、K，相对亏损 P。岩体中的 La/Sm、Th/La 和 Nb/U 比值显示在就位过程中经历了一定程度的地壳混染。研究认为，岩体的岩浆源区为亏损地幔。结合区域演化，认为岩体形成于碰撞后伸展的背景。

In order to determine the petrogenesis and tectonic setting in the north of eastern Kunlun orogenic belt，the authors analyze the whole rock geochemical characteristics of gabbro in the Binggounan copper- nickel de- posit． The SiO 2 content of Binggounan gabbros is 49. 72% to 51. 58% and rock series are of calcium alkali． Chon- drte- normalized REE patterns are LREE- slight rich，δEu are 1. 26 ～ 1. 54 with slight Eu positive anomaly． The gabbros are enriched in large ion lithophile elements (LILE) Rb，Ba，K and relatively depleted in P． The La/ Sm，Th/La and Nb/U values suggest that rock masses have experienced some crustal contamination in the process of emplacement． Studies suggest that the primary magma deprived from a depleted mantle． Combining with regional tectonic evolution，the authors conclude that the gabbro formed in the post- collisional extension setting．