招平断裂带北段金矿找矿新进展及控矿构造新认识

New Prospecting Progess of Gold Deposits and New Understanding of Ore-controlling Structures in North Section of Zhaoping Fracture Zone

招平断裂带北段以玲珑金矿田的石英脉型金矿而闻名于世。21世纪以来,随着深部找矿的不断深入,地质工作者突破传统的石英脉型金矿找矿思路,将深部找矿的方向聚焦于招平断裂带北段的主干断裂蚀变破碎带上,蚀变岩型金矿找矿取得了重大的突破,截至2018年5月,累计探获新增金资源量超过800t。通过对招平断裂带北段空间展布、构造演化、构造控矿、构造-蚀变-矿化时空关系等方面的研究,发现NNE向的九曲蒋家断裂带及NE向破头青断裂在构造活动时间、蚀变特征、控矿特征等方面具有高度一致性,认为二者均为招平断裂带的分支。通过对两条断裂带的构造发育程度、蚀变强度、控制矿体规模等方面的对比研究,提出九曲蒋家断裂带为主干断裂,其深部找矿潜力更大,应为今后地质找矿的主要对象。

The north section of Zhaoping fracture zone is famous for I.inglong quartz vein type gold deposit. Since the 21st century, with the deepening of deep prospecting, geologists have broken through the tradi tional thinking of quartz vein type gold deposit prospecting, and focused the direction of deep prospecting on the main altered fracture zone in the northern part of Zhaoping fault belt. Great breakthroughs in al tered rock type gold deposit prospecting have been gained. By 2018, the quantity of the new found gold resources have exceeded 800 tons. Based on the study of spatial distribution, structural evolution, struc tural ore control, tectonic alteration mineralization spatial temporal relationship in the northern part of Zhaoping fracture zone, it is found that Jiuqujiangjia fault zone with the trend of NNE and Batouqing fault with the trend of NE are highly consistent with the tectonic activity time, alteration characteristics and ore control characteristics. They are all branches of Zhaoping fracture zone. Through comparative stud y of the structural development, alteration intensity and ore controlling scale of the two fault zones, it is found that Jiuqujiangjia fault zone is the main fault of Zhaoping fracture zone. Its deep prospecting poten tial is great. It should be the main target for future geological prospecting.