Application of hydrocarbon-mercury superimposed halo method in red beds:A case study of the Woxi gold deposit, Hunan Province
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摘要: 为了更进一步验证烃汞叠加晕法在红层覆盖区“探深找盲“的可行性,在红岩溪矿段白垩系红层覆盖区面积4.3 km2范围内开展了网度为160 mx20 m的烃汞叠加晕面积性试验工作。通过总结红层土壤成矿元素与烃汞组分异常叠加特征、异常场结构和异常模式、空间对应关系以及在平面上分布规律,得出了以下结论:① 红岩溪矿段红层土壤地球化学场存在深源叠加场和同生叠加场。② 在矿脉走向上,同生叠加异常为无矿段,深源叠加异常为有矿段;在矿脉倾向上,对偶双峰异常模式控制矿体产出位置为有矿段,反之,为无矿段。③ 在平面图上,由对偶双峰异常模式中头部和尾部异常形成的环带异常的展布方向,为矿体侧伏方向;不同环带异常叠加,说明深部有平行盲脉产出,通过深部工程验证取得了较好的预测效果。Abstract: To further verify the feasibility of the hydrocarbon-mercury superimposed halo method in the coverage area of red beds in prospecting deep deposits, this study carried out area tests of hydrocarbon-mercury superimposed halo in 4.3 km2 of coverage area of Cretaceous red beds in the Hongyanxi ore block using a grid density of 160 m x 20 m. The following conclusions were drawn by summarizing the characteristics of the anomalies of metallogenic elements and hydrocarbon-mercury components in the soil in the red beds, including their superposition characteristics, field structures, patterns, spatial correspondence, and planar distribution patterns. ① There are deep-source and syngenetic superimposed fields in the soil geochemical field of red beds in the Hongyanxi ore block; ② Along the strikes of ore veins, syngeneic superimposed anomalies correspond to barren sections, while the deep-source superimposed anomalies correspond to ore sections. Along the dip directions of ore veins, the ore bodies under the control of paired bimodal anomaly mode occur in ore sections, while other ore bodies occur in barren sections; ③ Planarly, the distribution direction of zonal anomalies consisting of anomalies in the head and tail parts of the paired bimodal anomaly pattern is the pitch directions of orebodies. The superposition of different zonal anomalies indicates the occurrence of parallel blind veins in deep parts. These conclusions were verified in deep engineering, indicating ideal prediction results.
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