甘肃合作市岗岔—克莫金矿区成矿预测与找矿方向

发布时间：2018-05-30 23:08

本文选题：XRF快速分析仪 + 土壤化探　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：西秦岭是我国西北地区主要的金成矿区带,矿床类型多样,资源潜力巨大。甘肃岗岔金矿位于西秦岭造山带,具有浅成低温热液矿床的特征,并初步显示深部存在斑岩型矿床和隐爆角砾岩矿床的地质特征。已有的勘探工作表明:岗岔金矿床储量已达中型,该矿床南部克莫一带也显示出有利成矿条件,具有进一步扩大储量的潜力,因此本论文将岗岔-克莫作为成矿预测的研究区,主要通过地球化学和地球物理测量,试图为评价矿区找矿潜力提供依据。地球化学测量是找矿的有效手段之一。采用手持式快速元素分析仪(XRF),通过土壤次生晕以及岩石原生晕,进行了元素组合测量与分析,结果显示岗岔金矿区的南侧,由NNE走向的下家门沟、NEE走向的岗岔河和北西走向大断裂围限呈“三角区”地段呈现强烈的Au-Ag-As-Sb-Pb-Zn元素组合异常,暗示该地段属于金成矿有利地段,是进一步勘查的靶区之一。此外,岗岔金矿区内矿脉和断裂构造的空间分布规律表明,几乎所有矿脉均明显受近南北向断裂构造控制。显然,断裂构造为矿区成矿流体提供了运移通道,也是有利的容矿空间,因此对矿区内断裂构造产状及其空间展布的研究尤显重要。通过可控源音频大地电磁法对深部断裂的追溯,证实岗岔金矿区的Au-1、Au-2和Au-3号脉所在的断裂向南延伸进入了上述化探揭示的Au-Ag-As-Sb-Pb-Zn异常“三角区”,并与“三角区”内密集的断裂形成连通关系。这说明岗岔金矿的控矿断裂系统延伸到了其南部的“三角区”。为了查证延伸到“三角区”断裂系统的含矿性,在岗岔金矿及其南延地段进行了激电中梯法物探测量,结果显示:岗岔矿区北部浅部具有低阻高激化特征,而南部深部显示低阻高激化特征,暗示近南北向断裂系统含矿具有向南侧伏趋势。综合看,岗岔矿区南侧深部存在矿化有利区域。这一认识为深部找矿提供了新的证据。综上所述认为,由岗岔河、下家门沟和北西走向大断裂围限的“三角区”可能存在一个热液活动中心,其深部有很大的成矿潜力,可以进行深部找矿勘查。
[Abstract]:West Qinling is the main gold metallogenic belt in northwest China. The Gangcha gold deposit is located in the West Qinling orogenic belt and has the characteristics of epithermal deposits. It is shown that there are porphyry deposits and crypto-explosive breccia deposits in the deep. The existing exploration work shows that the Gangcha gold deposit has reached a medium reserve, and the southern Kemo area of the deposit also shows favorable metallogenic conditions and has the potential to further expand the reserves. Therefore, in this paper, Gangcha Kemo is regarded as the study area for metallogenic prediction. Mainly through geochemical and geophysical survey, this paper tries to provide the basis for evaluating the prospecting potential of mining area. Geochemical survey is one of the effective methods for prospecting. The element combination measurement and analysis were carried out by means of the hand-held fast element analyzer XRF, through soil secondary halo and rock primary halo. The results show that the south side of the Gangcha gold deposit is located on the south side. The fault confining limits of the Gangcha River and the NW strike along the Xiamenggou and NEE strike from the NNE strike show strong Au-Ag-As-Sb-Pb-Zn element assemblage anomalies in the "triangle zone", implying that the area belongs to the favorable gold-metallogenic area and is one of the target areas for further exploration. In addition, the spatial distribution of veins and fault structures in the Gangcha gold deposit indicates that almost all veins are obviously controlled by the near-north-south fault structure. It is obvious that fault structure provides a migration channel for ore-forming fluids and is also a favorable ore-bearing space, so it is particularly important to study the occurrence and spatial distribution of fault structures in the mining area. By tracing the deep faults by using controllable source audio frequency magnetotelluric method, it is confirmed that the faults located in the Au-1U Au-2 and Au-3 veins in the Gangcha gold deposit extend southward into the "triangle" of the Au-Ag-As-Sb-Pb-Zn anomaly revealed by the geochemical exploration above. And connected with the dense faults in the triangle. This indicates that the ore-controlling fault system of Gangcha gold deposit extends to the "triangle area" in the south of the gold deposit. In order to verify the ore-bearing property of the fault system extending to the "triangle area", the geophysical survey of the Gangcha gold mine and its southern extension by the IP mid-ladder method has been carried out. The results show that the shallow part of the northern part of the Gangcha mining area has the characteristics of low resistivity and high aggravation. However, the deep part of the south shows the characteristics of low resistivity and high aggravation, implying that the ore-bearing system of the near-north-south fault system is trending to the south. On the south side of Gangcha mining area, there are favorable areas for mineralization. This knowledge provides new evidence for deep prospecting. In summary, it is concluded that there may be a hydrothermal active center in the triangle area bounded by the great faults of the Gangcha River, Xiaminggou and NW strike, and its deep depth has great metallogenic potential, which can be used for deep prospecting and exploration.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.51

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