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双王金矿床是秦岭地区大型的危机矿山之一,找矿工作是当务之急,但其成因类型特殊,人们对其成矿构造的演化过程和控矿机制尚存在争议.以该矿床KT5矿体为例,研究了角砾岩体、断裂裂隙和金品位的空间分布关系,并结合趋势面分析,探讨了金矿化富集规律及其对成矿构造的指示意义.矿床地质特征及对矿区内基性岩墙的测年结果表明其成矿时代为印支期.在印支期秦岭造山过程中的NS向主压应力背景下,成矿断裂早期右行斜向剪切作用奠定了角砾岩带的雏形;断裂中期活动引发的地震及伴生液压致裂作用,使矿区内形成了角砾岩主体和断裂裂隙系统,主成矿阶段角砾岩化作用减弱,断裂裂隙持续发育,并作为流体运移和成矿的主要通道和有利部位,使金的矿化富集呈面状展布,断裂裂隙带的产状变化是金沉淀的重要影响因素;晚期构造应力转换为近EW向拉伸,近NS向基性岩墙群侵位并受到成矿流体的改造.
The Shuangwang gold deposit is one of the large-scale crisis mines in the Qinling area, and the prospecting work is a top priority, but its genetic type is special and people are still controversial about the evolution process and the ore-controlling mechanism of its metallogenic structure.With the deposit KT5 In this paper, the spatial distribution of breccia body, fracture fissure and gold grade is studied, and the trend of gold mineralization and its indication to the metallogenic structure are discussed in combination with the trend surface analysis. The dating of basic dykes shows that the metallogenic epoch was Indosinian period.Under the NS-directed major compressional stress during the Indosinian Qinling orogeny, the early right diagonal shearing of the metallogenic fault lays the foundation for breccia The rupture of the rock belt; the earthquake caused by mid-fault activity and associated hydraulic fracturing, which formed the main body of breccia and fractured fracture system in the mining area. The brecciated lithification in the main metallogenetic stage weakened and the fractured fractures continued to develop. Fluid migration and metallogenic major channels and favorable sites make the mineralization of gold surface distribution, and the occurrence of fracture zone is an important factor of gold precipitation. Late tectonic stress is converted to near EW Stretching, near NS to the base Sexual dykes are emplaced and transformed by ore-forming fluids.