内蒙古喀喇沁旗金蟾山金矿构造叠加晕异常特征及找矿预测

    Structural superimposed halo anomalies and prospecting prediction of Jinchanshan gold deposit, Harqin Banner, Inner Mongolia, China

    • 摘要: 内蒙古喀喇沁旗金蟾山金矿是与燕山期岩浆有关的岩浆—热液脉型金矿床,构造位置属于赤峰—朝阳金矿集中区,矿体主要赋存在安家营子岩体的断裂构造带内。本次研究对金蟾山金矿东矿化带自南至北南大洼矿段、李麻子沟矿段进行了系统的构造叠加晕异常分析。研究表明,金蟾山金矿原生晕轴向分带及特征参数与热液矿床原生晕典型高温—中温—低温元素轴向分带序列不相符,出现高温元素和低温元素相互重叠出现的现象,说明成矿作用具有多阶段多期次叠加的特点。本文首次利用各元素垂向不同标高的元素相关性对比分析曲线进行元素相关性分析,更好地分析了不同元素在不同标高的相关性特征,筛选出前缘晕元素为F、Ba,近矿晕元素为Au、Cu、Ag,尾矿晕元素为Co、Ti、V。通过建立构造叠加晕找矿模型圈定找矿靶区,并经采矿验证,见矿中段与预测靶区吻合。

       

      Abstract: The Jinchanshan gold deposit, identified as a magmatic-hydrothermal vein-type gold deposit associated with Yanshanian magmatism, is located in the Chifeng-Chaoyang gold ore concentration area within Harqin Banner, Inner Mongolia. The ore bodies in the deposit primarily occur in the fault structural zone of the Anjiayingzi pluton. This study conducted a systematic analysis of the structural superimposed halo anomalies of the Dawa and Limazigou ore sections from south to north in the eastern mineralized zone in the Jinchanshan gold deposit. Results indicate that the axial zoning and characteristic parameters of primary haloes in Jinchanshan gold deposit differ from the typical high-, medium-, and low-temperature element axial zoning sequence in hydrothermal deposits. The overlapping of high-temperature and low-temperature elements, suggests multi-stage and multi-phase mineralization processes. For the first time, this study analyzed the correlation between elements using element correlation curves at varying elevations. F and Ba were identified as front halo elements, Au, Cu, and Ag as near-ore halo elements, and Co, Ti, and V as tail halo elements. By establishing a structural superimposed halo model, this study determined prospecting target areas. Mining validation indicates that the identified ore-discovery middle section aligns with the predicted target area.

       

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