一、地质概况兰芝山花岗质杂岩体位于山西五台山地区,是区内面积最大的太古宙花岗质地质体之一(图1)。岩体与太古宙龙泉关群为过渡或侵入关系,被长城系高于庄组、晚太古代五台群板峪口组①(?)不整合覆盖。板峪口组为一套浅变质的砂泥质岩,变质级别相当于 Turner(1981)的绿片岩相的低级阶段,Winkler(1976)的低级变质作用。龙泉关 I. Geological Survey The Lanshi Mountain granitic complex is located in the Wutai Mountain area of ​​Shanxi Province and is one of the largest archean granitic geological bodies in the area (Figure 1). The rock mass is linked with the Archean Longquan Guan Group in the transitional or intrusive relationship and is unconformably covered by the Gao Yuzhuang Formation of the Great Wall and the Baniyukou Formation ① (?) Of the Late Archean Wutai Group. The Plate-Yukou Formation is a set of super-metamorphic sand-shale rocks. The metamorphism level is equivalent to the lower stage of the greenschist facies of Turner (1981) and the low-grade metamorphism of Winkler (1976). Longquan off