Analysis of Orebody Morphology and Tectonic Genesis of the Siding Lead-Zinc Deposit of Guangxi
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摘要:
研究矿体形貌分类，鉴别控制矿体的成矿构造类型，是成矿构造研究与预测的基础性工作，在矿山深部找矿工作中具有指导意义。广西泗顶铅锌矿床是桂北铅锌成矿区中大型矿床的典型代表，经过多年开采，其矿体的三维形貌已展露无遗，具有进行矿体形貌及构造成因研究的良好条件。基于矿体形貌视角，通过矿体形貌的几何特征及成因特征解析，建立矿体的构造成矿模式，分析讨论矿床的构造成因与动力学背景。研究结果表明：①泗顶矿区成矿构造类型分为两类，一类为早期构造流体型成矿构造，控制脉状铅锌矿体；另一类为晚期构造型成矿构造，控制蚀变岩型贫矿体，并叠加于早期脉状矿体之上。②矿体形貌由NE向右行张扭性断层控制形成的构造顺层脉型、NW向右行张性断层控制形成的构造切层脉型和脆–韧性剪切带控制形成的构造–流体型3种矿体形貌组成。基于矿体形貌建立以Ⅰ、Ⅳ号矿体为代表的构造顺层式成矿模式和以Ⅴ号矿体代表的构造切层式成矿模式。③区域动力学表明，泗顶矿区经历了多期构造运动，尤其是印支期的两次动力转换（早期SE向区域挤压力转换为EW向右行走滑剪切，晚期近EW向右行剪切则转换为EW向挤压），为矿床的形成提供了优越的动力条件。④矿田动力学分析认为，泗顶铅锌成矿作用发生在脆–韧性剪切带演化到脆性阶段，应力弱化、变形分解、递进变形、非共轴剪切和层间滑动共同控制了各类几何矿体形貌的形成。
Abstract:Studying the classification of orebody morphology and identifying the types of ore-forming structures controlling the orebody are the basic work for the research and prediction of ore-forming structures, and have guiding significance in the deep prospecting work of the mine. The Siding Lead-Zinc deposit in Guangxi is a typical representative of medium-large deposits in the Lead-Zinc metallogenic region in northern Guangxi. After many years of mining, the three-dimensional morphology of the orebody has been fully revealed, and it has good conditions for studying of the orebody morphology and structural genesis of the deposit.In this paper, based on the study of orebody morphology, the structural mineralization mode of orebody is constructed by analyzing the geometric characteristics and genesis characteristics of orebody morphology, and then the tectonic genesis of ore deposit formation is analyzed and discussed from the regional and field kinetic levels. The results show that: ① There are two types of ore-forming structures in the Siding mining area. One is the early tectonic fluid type ore-forming structure, which controls the vein Lead-Zinc orebody; The other is the late tectonic ore-forming structure, which controls the altered rock type lean orebody and superimposes on the early vein ore body. ② The orebody morphology is composed of three types of orebody morphology, namely, the structural bedding vein type formed by the control of the north-east right-trending tensional fault, the structural shear vein type formed by the control of the north-west right-trending tensional fault, and the structure-fluid type formed by the control of the brittle-ductile shear zone. Based on the orebody morphology, the structural bedding mineralization model represented by No. I and IV orebodies and the structural slicing mineralization model represented by No. V ore bodies are established. ③ The regional dynamics shows that the Siding mining area has experienced multiple tectonic movements, especially the two dynamic transformations in Indosinian period (the early SE regional compression pressure was converted to east-west rightward strike-slip shear, and the late near-EW rightward strike-slip shear was converted to east-west compression), which provided superior dynamic conditions for the formation of the deposit. ④ According to the ore field dynamics analysis, the Siding Lead-Zinc mineralization occurred in the brittle-ductile shear zone evolution to the brittle stage, and the stress weakening, deformation decomposition, progressive deformation, non-coaxial shear and interlayer Sliding jointly controlled the formation of various geometric orebody morphology.
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Key words:
- orebody morphology /
- metallogenic structures /
- regional dynamics /
- Lead-zinc deposit /
- Guangxi Siding
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