青海赛坝沟金矿床Ⅳ-3号矿体原生晕特征与深部预测

摘要

According to the study of elements in theⅣ⁃3 orebody of the Saibagou gold deposit, the authors hold that the primary halo displays the feature of axial zoning. Its front halo, near⁃ore halo and rear halo are distributed disorderly, and exhibit obvious reverse zoning. Along the axial zoning, Au and Ni show good linear correlation. The existence of front element (Hg) indicates that the space of downward extension is large. Compared with the geochemiscal data of axial zoning, the depth of the orebody increases gradually, and geochemistry displays the characteristics of rise⁃fall⁃rise. These data suggest that the orebody extends downward considerably from 3 162 m. On the basis of this study, the authors formulated an ideal model of superimposed halo and extracted geochemscal information for the prediction of small ore deposits in the surrounding areas.%对赛坝沟金矿床Ⅳ⁃3号矿体原生晕元素进行理论性分析后得到原生晕轴向分带特征，其前缘晕、近矿晕、尾晕分布混杂，呈现出明显的逆向分带特征，其中轴向分带序列最后出现的Au和Ni呈现良好的相关性以及前缘元素Hg的出现，指示矿体向下的延伸空间较大。进一步对其轴向地球化学参数进行对比，矿体由浅至深，地球化学参数具有“升—降—升”的变化特征，显示矿体在3162 m中段往下还有很大的延伸性。通过对该矿体原生晕轴向分带序列及地球化学参数的研究对比，建立矿体的叠加晕理想模型，为矿区深部及其周边小型矿床的评价预测提供地球化学依据。