高寒浅覆盖景观区深穿透地球化学勘查技术应用与示范

    Application and demonstration of deep-penetrating geochemical exploration techniques in alpine shallow overburden areas

    • 摘要: 为攻克高寒浅覆盖区隐伏矿勘查技术瓶颈,以柴达木盆地周缘中低山荒漠草原、冲积—洪积砂砾质戈壁两大典型景观区为研究对象,开展深穿透地球化学方法试验与示范应用。结果表明:覆盖层细粒(d≤96 μm)、微细粒(d≤20 μm)及极细粒(d≤5 μm)物质占比,是深穿透方法有效性与适配性评价的核心依据;通过热龙、鱼卡金矿的多方法有效性试验,明确了不同技术在不同景观区的适用效能差异;优选土壤微细粒测量开展面积性示范,圈定的异常与已知矿化带高度吻合,并在热龙金矿发现金品位达3.85 g/t的隐伏矿体;最终提出了适配于高寒浅覆盖区的“扫面—查证—定位”三级技术组合。本次研究成果为同类区域隐伏矿勘查提供了技术支撑。

       

      Abstract: This study aims to address the technical challenges in exploring concealed ore bodies in alpine shallow overburden areas. Hence, it conducted the application test and demonstration of deep-penetrating geochemical exploration techniques in two typical landscape areas: the low-to-middle mountainous desert steppe and the alluvial-proluvial gravelly Gobi along the periphery of the Qaidam Basin. The results show that the proportions of fine-grained (d≤96 μm), micro-fine-grained (d≤20 μm), and ultra-fine-grained (d≤5 μm) materials in the overburden serve as the core basis for evaluating the effectiveness and adaptability of deep-penetrating geochemical exploration techniques. Through the multi-technique effectiveness tests conducted in the Relong and Yuka gold deposits, the differences in application efficiency of various techniques across different landscape areas were clarified. The measurement of micro-fine-grained soils was employed for a large-scale demonstration application, with the delineated anomalies highly coinciding with the known mineralized zones. Moreover, a concealed ore body with a gold grade of up to 3.85 g/t was discovered in the Relong gold deposit. Finally, a three-level technical combination, consisting of regional reconnaissance, anomaly verification, and ore body positioning, was proposed for alpine shallow overburden areas. Overall, the results of this study provide technical support for the exploration of concealed ore bodies in similar areas.

       

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