TECTONIC DEFORMATION CHARACTERISTICS AND ORE-CONTROL SIGNIFICANCE OF THE SANJIASHAN DUCTILE SHEAR ZONE IN BEISHAN OROGENIC BELT, XINJIANG
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摘要: 为进一步查明北山造山带北缘三架山韧性剪切带的构造运动学特征及控矿意义，在充分收集前人工作成果的基础上，通过开展系统的野外地质调查工作，基本查明了韧性剪切构造带的空间分布、物质组成、力学性质，在充分分析研究典型构造现象的宏观及显微构造变形特征基础上结合韧性剪切带内卷入地层变质特征和剪切带内岩石组合特征，认为三架山韧性剪切带属中浅部构造相，总体上反应出逆冲—左行走滑的特征。结合带内已发现的产于前寒武系变质基底的铅锌矿和韧性剪切带内的金矿赋矿特征，认为该韧性剪切带对前寒武系变质结晶基底的活化、古生代火山—沉积盖层的改造起到了至关重要的作用，具有明显的导矿、控矿作用。Abstract: To further investigate the tectonic movement and ore-controlling significance of the Sanjiashan ductile shear zone on the northern margin of the Beishan orogenic belt, on the basis of fully collecting the results of previous work, through carrying out the systematic field geological surveys, the spatial distribution, material composition and mechanical properties of the ductile shear zone are basically identified. After the analysis of the macroscopic and microstructural deformation characteristics of the typical tectonic phenomena, combined with the metamorphic characteristics and shearing of the stratigraphic shear zone, the characteristics of the in-band rock combination, it is considered that the Sanjiashan ductile shear zone belongs to the middle—shallow tectonic facies and generally reflects the characteristics of thrust—left—slip. Combined with the gold deposits in the lead-zinc deposits and ductile shear zones of the Precambrian metamorphic basement discovered in the belt, it is believed that the ductile shear zone plays an important role in the activation of the Precambrian metamorphic crystalline basement and the transformation of the Paleozoic volcano-sedimentary caprock, with obvious guiding and ore-controlling effects.
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图 1 研究区地质与矿产分布图
1—第四系；2—第三系库车组；3—中二叠统骆驼沟组；4—下二叠统红柳河组；5—中奥陶统锡林柯博组；6—中下奥陶统罗雅楚山群；7—中上寒武统西双鹰山组；8—下寒武统双鹰山组；9—蓟县系平头山组；10—长城系古硐井岩群；11—中三叠世二长花岗岩；12—早二叠世花岗岩；13—早二叠世辉长岩；14—早石炭世二长花岗岩；15—早石炭世花岗闪长岩；16—早石炭世闪长岩；17—早泥盆世二长花岗岩；18—早泥盆世花岗闪长岩；19—晚奥陶世二长花岗岩；20—断裂；21—平推断层；22—剪切带；23—铅锌矿；24—铁矿；25—金矿；26—磷钒矿
Figure 1. Geological and mineral distribution map of the research area
图 2 三架山韧性剪切带宏观及显微构造变形特征典型照片
Figure 2. The typical characteristics photos of macroscopic and microstructural deformation in Sanjiashan
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