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礼县庙山金矿位于西秦岭造山带岷(县)—礼(县)金成矿带,区内岩浆活动频繁,热液蚀变强烈,容矿、导矿构造发育。本文通过野外观察和室内整理勘查区内的地质特征,认为庙山金矿赋存于中石炭统碎屑岩建造中,岩浆热源和含矿热液沿断裂、裂隙运动,在有利部位富集成矿,该金矿具有中低温热液型矿床特征。勘查区出露的中石炭统第一岩性段内的粉砂质板岩、变石英砂岩是找金的有利岩相、岩性标志;NE向断层破碎带以及断裂旁侧与其平行、分枝的次级断裂的膨大部位、断裂交汇部位是金的储矿空间;金属硫化物细脉、褐铁矿化、辰砂化、硅化和褪色蚀变标志明显;花岗斑岩脉和煌斑岩脉与金矿体常相伴出现。近年来持续勘查取得显著成果,主矿体深部延伸稳定,矿床规模扩大,总结庙山金矿床地质特征及找矿标志,对于西秦岭地区岷(县)—礼(县)金成矿带具有借鉴意义。
The Lixian Miaoshan Gold Mine is located in the Min (county) -li (county) gold metallogenic belt in the Western Qinling orogen, with frequent magmatic activities and strong hydrothermal alteration and mineralization and ore-bearing structural development. Based on the field observation and indoor geological survey, the authors believe that the Miaoshan gold deposit was hosted in the Carboniferous clastic rocks. The magmatic heat source and ore-bearing hydrothermal fluids migrated along the faults and fractures and enriched the mineralization in the favorable locations , The gold deposit with low-temperature hydrothermal deposits characteristics. The silty slate and quartzite sandstones in the first lithofacies of the Carboniferous exposed in the exploration area are favorable lithofacies and lithological markers for gold prospecting. The NE-trending fault-fracture zone and its parallel to the fault flank Of the secondary rupture of the expansion of the site of the fault intersection of gold storage space; metal vein veins, limonite, cinnabar, silicification and faded alteration marked; granite porphyry and lamprophyre vein And often accompanied by gold ore appears. In recent years, the continuous exploration made remarkable achievements, the main ore body extends steadily in the deep part and the deposit scale expands. The geological features and prospecting signs of the Miaoshan gold deposit are summed up, which have reference significance to Min (county) -li (county) gold metallogenic belt in West Qinling area .