Stage Division and Ore-bearing Evaluation of Fault Tectonic in the Longmendian Silver Deposit, Luoning, Henan Province
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摘要: 熊耳山是中国重要的金、银、钼矿产区之一，区域工业矿体大都为构造控矿。本研究以龙门店银矿为例，基于安德森模式，利用StereoNett软件对K1和K6矿体的节理产状进行统计分析，结合区域地质演化史，将研究区断裂构造划分为4期。Ⅰ期近南-北向压应力形成的北东和北西向成矿前构造，并衍生北北东向断裂；Ⅱ期近南-北向引张环境形成的同成矿构造，使Ⅰ期形成的次级北东-北北东向断裂部分被石英脉充填，并伴随热液的沉淀和富集形成工业矿体，另外一些北东-北北东向和北西向断裂发生矿化；Ⅲ期北东-北东东向压应力作用形成的成矿后构造——局部发育北北东向断裂，切割前期形成的北东向断裂；Ⅳ期北西西向压应力作用形成的成矿后构造——北西向左行走滑断裂。分析认为，第Ⅰ期形成的北北东向断裂具有较好的含矿性，在后期找矿工作中应重点关注。Abstract: The Xiong'ershan is one of the most important gold, silver and molybdenum producing areas in China, and most of the regional industrial orebodies are controlled by the faults. This study takes the Longmendian silver deposit as an example, the occurrences of K1 and K6 ore bodies are statistically analyzed by StereoNett software based on the Anderson model. Combined with the history of regional geological evolution, the fault structure in this study area has been divided into four stages:Stage I is NE and NW faults formed by near S-N compressive stress, and NNE-derived fractures; Stage Ⅱ is metasynthetic structures formed near the S-N extensional environment, the secondary NE-NNE formed in the first stage filled with quartz veins to the faults, and it is accompanied by the precipitation and enrichment of hydrothermal fluids to form industrial ore bodies, and some NE-NNE and NW fractures are mineralized; Stage Ⅲ in NE-NEE post-mineral structure formed by compressive stress, partially developed NNE and cut pre-NE fracture; Stage IV is post-mineral structure formed by NWW compressive stress-NW left-sliding slide fault. It is concluded that the NNE fault formed in the stage I has good ore-bearing property, which is of guiding significance for later prospecting.
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Keywords:
- Longmendian silver deposit /
- fault tectonic /
- stage division /
- ore-bearing property /
- Henan Province
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