Abstract:Yanshanian large granite is developed in Mufushan (Mufu Mountains) area, with a large number of granitic pegmatite veins and related rare metal deposits or mineralized bodies formed. Although the predecessors have systematically studied the geological and geochemical characteristics, formation ages, spatial distributions and evolution processes of granite, pegmatite and rare metal deposits in this area, and achieved a lot of results, there is still a lack of research on the controlment of geological structures on granite and rare metal pegmatite. Methods: In view of this, through the investigation of several geological sections across the contact zone of Mufushan granite, combined with the characteristics of regional geology and mineral development, this paper studied the Mesozoic tectono—magmatic evolution and the controlment of structures on granite, pegmatite veins and contact metamorphic zones in Mufushan area. Conclusions:The main achievements are as follows: (1) From Mesozoic to early Cenozoic, the study area experienced 7 tectonic stages, from early to late, such as ① marine basin of Early—Middle Triassic, ② Indosinian movement of late Middle Triassic to Late Triassic, ③ semi- foreland basin of late Late Triassic—early Middle Jurassic, ④ Early Yanshanian movement of late Middle Jurassic, ⑤ granitic magmatism and mineralization of Late Jurassic to early Early Cretaceous, ⑥ regional extension and faulted basins of late Early Cretaceous to middle Paleogene, and ⑦ NE compression in the middle—late Paleogene. (2) The boundary of Mufushan granite is mainly controlled by three groups of fault with NW- , NE- and NEE- trending, whose structural mechanism is essentially the controlment of fault blocks in or outside the granite area on the magma emplacement. (3) The granite emplacement structures of the granite can be qualitatively divided into four types: low emplacement—gently dipping contact structure, low emplacement—steep dipping contact structure, high emplacement—gently dipping contact structure and high emplacement—steep dipping contact structure. Among them, low emplacement—gently dipping contact structure is the most favorable for the formation of granitic pegmatite. (4) The structures controlling pegmatite veins include the dominant controlling structures such as bedding or interlayer shear planes, thrust faults, granite contact zones, and the restrictive controlling structures such as strike- slip shear fractures and axials of kink. The interlayer shear planes were mainly formed during the Wuling Movement; EW- and NWW- trending thrust faults, NWW- trending axials of kink, NNE- trending sinistral shear fractures and NNW- trending dextral shear fractures were formed under SN compression of Indosinian Movement; NWW- trending dextral shear fractures were formed under NWW compression of Early Yanshan ian movement. The strike of the structures in Renli area is the result of the later superposition of clockwise rotation. (5) Controlled by the granite contact zone and planar structures of different types and scales, the scale of pegmatite dikes in the surrounding rocks in Renli area changes from large to small, the occurrence of dikes changes from simple to complex, and the main ore- forming elements change from Nb—Ta Nb—Ta—Li—Cs from north to South.