湖南宝山铜铅锌多金属矿床构造控岩控矿模式

湖南宝山铜铅锌多金属矿床位于南岭东西向构造带与耒阳—临武南北向构造带的复合部位，是该区大型—超大型矿床的典型代表之一。矿床（体）与燕山早期花岗闪长斑岩体在空间上关系密切，均明显受构造控制。在大比例尺构造剖面精细解析基础上，分析构造类型及其主要特征，总结构造控岩控矿规律。研究认为:矽卡岩型铜钼矿体主要受北东—北东东向褶皱控制；热液脉型铅锌银矿体主要受褶皱翼部层间断裂及北东向压扭性断裂控制。构造应力场最大主应力方向经历了成矿前近南北向→成矿期近东西向→成矿后北东—南西向的转变。北东—北东东向压扭性断裂为导矿构造，北西西向张扭性断裂为控岩构造。构造不仅控制了成矿岩体的展布，而且控制了成矿类型的变化。在此基础上，建立了构造控岩控矿模式，指示已知矿体北西侧深部是有利的找矿地段。该研究为深部找矿预测提供重要依据，对坪宝矿田的找矿部署和深部勘查具有参考意义。 

Model of rock and ore controlling structures in the Baoshan Cu-Pb-Zn polymetallic deposit, southern Hunan province, China

The Baoshan Cu-Pb-Zn polymetallic deposit, located in the overlapped part of the Nanling EW-trending tectonic belt and the Leiyang-Linwu SN-trending tectonic belt, is a typical large and super-large mineral deposit in this area. The deposit and ore-bodies are spatially closely related to the early Yanshanian granodiorite porphyry and obviously controlled by the structure. Based on precise measurement of the large-scale structural sections, this paper analyzes the structural types and their main characteristics, and summarizes the rules of structural control on rock and ore. The results show that the SK-type Cu-Mo ore-bodies are mainly controlled by NE-NEE-trending folds. The hydrothermal vein-type Pb-Zn-Ag ore-bodies are mainly controlled by the interlayer faults of fold flanks and the NE-trending compression-torsion faults. The direction of the max principal stress of the tectonic stress field experienced the transformation from near SN-trending before mineralization to near EW-trending during mineralization to NE-SW-trending after mineralization. The NE-NEE-trending compression-torsion faults are the main ore guiding structures, and the NWW-trending compression-tension faults are the main rock control structures. The structures not only control the distribution of ore-forming bodies, but also control the change of ore-forming types. On this basis the model of rock and ore controlling structures is established, indicating the deep NW-trending of the known ore-bodies is the favorable prospecting area. This study provides favorable evidence for ore-prospecting work at depth, and has reference significance for the suggesting of prospecting plan and deep exploration of the Pingbao ore field.