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根据岩层能干性特征,五圩矿集区整体结构为两“强”夹一“弱”的“三明治”岩层结构,以箭猪坡最为典型,赋矿层位为弱能干性泥岩层。通过对箭猪坡矿床脉状矿体构式和平面、剖面矿脉展布特征的观察和分析,判断矿体形成于印支早期脆—韧性逆冲剪切带中,矿脉呈雁列状向深部倾伏,之后受印支晚期断展褶皱和燕山期SN向褶皱叠加、改造,最终使矿脉走向为NNW、剖面呈正“八”字形分布。矿脉直接受脆—韧性逆冲剪切带分布范围的控制。由此推断,具备“三明治”岩层结构的丹池成矿带内,在中间的泥岩层内均可能赋存脆—韧性剪切带控制的脉状矿体。
According to the characteristics of rock formability, the overall structure of Wuwei ore district is composed of two “strong” sandwiches with a “weak” sandstone structure. Mudstone layer. Through the observation and analysis of the structure and the distribution features of vein and vein in the vein porphyry in the Dianzhifo deposit, it is concluded that the ore body was formed in the early Indosinian brittle-ductile shear zone and the veins are in an echelon to the deep Afterwards, it was superimposed and reconstructed by late Indosinian fold folds and Yanshan SN fold to finally make the ore veins to NNW with positive “eight” zigzag distribution. The veins are directly controlled by the distribution range of brittle-ductile shear zone. It can be inferred that the Danchi metallogenic belt with the “sandwich” structure may have a vein-like ore body controlled by brittle-ductile shear zones in the middle mudstone.