内蒙武川—固阳—大佘太韧性剪切带与金矿  

DUCTILE SHEAR ZONE AND GOLD DEPOSITS IN WUCHUAN- GUYANG-DASHETAI INNER MONGOLIA

作　　者：孙德育[1] 梁一鸿[1] 张业明 

机构地区：[1]长春地质学院地质系

出　　处：《长春地质学院学报》1990年第4期399-406,428,共9页

摘　　要：内蒙中部武川—固阳—大余太东西向韧性剪切带内发育明显的糜核岩显微组构。据剪切带内糜棱岩形成温压条件(t=300～400℃,P=0.25～0.5GPa),表明它是绿片岩相变质—变形环境。剪切应变值γ=5.77～3.47。变形是以简单剪切为主,兼有压扁作用。剪切带南侧是早元古宙强烈线性构造活动带,北侧是晚太古宙花岗岩—绿岩带。剪切带形成在早元古宇,早期表现为自北向南的推覆韧性剪切作用。岩金矿(化)床沿着剪切带分布。尤其在后期脆性破裂叠加及中酸性岩浆岩所在部位,金矿进一步富集,说明本区岩金矿的形成是多阶段成矿作用的结果。The mylonite in ductile shear zone in Wuchuan-Guyang-Dashetai area is rich in microfabrics.The mineral composition of the mylonite, as well as the test result of p-t condition of the mineral formation(t = 300-400C, p = 0.25-0.5GPa)indica-tes that the ductile shear zone was developed under the condition of defor- rmation and metamorphism of green shist facies. The value of shear strain (r) was measured as 5.77 3.4.It indicates that the deformation mechanism is simple shear and flattening.In the south of the ductile shear zone(Daqing Mt.and Wula Mt.), there i a strongly lineared structure of Early Froterczoic.In the north, there are oval structures and linear structures, the oval structures are dominated by Archaean metamorphic complex, the linear structures are dominated by green stones. The shear zone formed in Early Proterozoic.It shows the characteristic of ductile shear thrusting towards south.Along the shear zone gold deposits was distributed in band.The formation of the deposits is closely related to-the shear zone, especially those parts of which cut by brittle faults, as well as intruded by magmas. In those parts,gold further enriched. This suggests that the gold deposits had undergone multiple mineralization.

关 键 词：内蒙 剪切带 韧性剪切 金矿 分布 

分 类 号：P618.510.6[天文地球—矿床学]