Discussion on Geological Characteristics and Genesis of Taojinchong Gold Deposit in the West Section of Jiangnan Orogenic Belt
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摘要: 淘金冲金矿床是江南造山带内重要的大型金矿床之一，赋存于新元古界板溪群浅变质岩系内。矿体受断裂构造控制，金矿体在垂向上具有分段富集的特点，矿石类型由浅部石英脉型变化为中深部石英脉+蚀变岩型。矿体随深度增加品位变高、厚度变大，深部找矿潜力较大。微量元素分析结果表明，在石英脉及构造破碎带附近，金含量远高于围岩，说明构造对该区Au等成矿元素的运移富集有明显控制作用。Re-Os同位素特征指示成矿物质来源于地壳，很可能来自地层。稀土元素分析结果表明，沉凝灰岩、碎裂岩、辉绿岩、金矿石的稀土元素配分模式基本一致，暗示成矿物质可能来源于地层和岩浆岩。δ34S值集中于-1‰～2‰，表明硫来源于岩浆。综合地质特征、稀土元素及同位素特征，认为成矿物质来源于岩浆对地层的萃取。结合前人研究成果，淘金冲金矿床可能形成于加里东运动构造隆升阶段，在岩浆热液与区域构造活动联合作用下，区内浅变质岩系中成矿物质被萃取，形成含矿流体，在有利构造部位形成金矿体。Abstract: Taojinchong gold deposit is one of the most important large gold deposits in the Jiangnan Orogenic belt, which occurs in shallow metamorphic rock of Neoproterozoic Banxi Group. The ore bodies are controlled by fault structure, and the gold ore bodies have the characteristics of sublevel enrichment in vertical direction. With higher grade and larger thickness, deep prospecting potential of gold ore is larger. The results of trace element analysis show that the gold content in the vicinity of quartz veins and tectonic fracture zone is much higher than that in the surrounding rock, which indicates that the structure has obvious control on the migration and enrichment of ore-forming elements such as Au in this area. The ore-bearing strata are ore-bearing structures rich in gold ore-forming element association. The Re-Os isotopic characteristics indicate that the ore-forming material originates from the crust, probably from the stratum. The REE analysis results show that the REE partitioning patterns of tuff, cataclastic rock, diabase and gold ore are basically the same, suggesting that the ore-forming materials may come from strata and magmatic rocks. The δ34S values range from -1‰ to 2‰, indicating that the sulfur comes from deep magma. Based on the geological characteristics, rare earth elements and isotope characteristics, it is believed that the ore-forming materials come from the extraction of strata by magma. Together with previous research results, the Taojinchong gold deposit can be inferred to be formed in the Caledonian tectonic uplift stage. Under the combined action of magmatic hydrothermal solution and regional tectonic activity, the ore-forming materials in the shallow Metamorphic rock series in the area were extracted to form ore bearing fluid, and gold ore bodies were formed at favorable structural positions.
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