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马衔山变形花岗岩体位于祁连造山带的最东端，表壳岩属前长城纪地层，侵入时代为吕梁期，已获单矿物锆石Ｕ－Ｐｂ等时线年龄值２１５２Ｍａ。主体岩石类型为片麻状二长花岗岩、片麻状钾长花岗岩，后者侵入前者。岩石学、岩石地球化学特征表明，马衔山变形岩体的岩石类型存在明显的岩石成分演化关系，成岩物质来源于地壳
The Maacengshan metamorphic granite is located in the easternmost part of the Qilian orogenic belt. The epicontinental rock belongs to the Qianchang Changcheng age strata, and the intrusive age is the Luliang period. The zircon U-Pb isochron age value of single mineral was 2152Ma. The main rock type is gneissic monzonitic granite and gneissic potassium-bearing granite, the latter invades the former. Petrology and lithogeochemical characteristics show that there is a clear evolution of rock composition in the rock types of the Macen Mountain metamorphic rock mass. The diagenetic material is derived from the crust