云南冬瓜林金矿床原生叠加晕特征与深部找矿
Primary superimposed halo features and deep ore-prospecting in the Donggualin gold deposit, Yunnan Province
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摘要: 冬瓜林金矿床位于哀牢山金矿带的镇沅金矿田。文章在野外地质工作的基础上，运用多元统计的方法，求得微量元素找矿标志；并根据地球化学各参数信息，计算出元素轴向分带序列，建立原生叠加晕理想模型，构建深部矿体预测指标，明确下一步的找矿方向。研究表明：（1）该矿床的成矿元素Au与元素Ni、Co、Cu、Mn、Sb、Sn关系密切，原生晕轴向分带序列从上到下为As-Bi-Mn-Pb-Sb-B-Sn-Cu-Co-Hg-Ni-Zn-Au-Ag-Mo；（2）矿体中前缘晕、尾晕共存现象明显，预示着矿体向下还有很大的延伸，深部找矿应在矿体的北东方向进行；（3）评价指标（B×As×Hg×Sb）D/（Mn×Ni×Co×Sn）D，是有效的预测深部矿体资源潜力指标。Abstract: The Donggualin gold deposit is located in the Zhenyuan gold orefield of the Ailaoshan gold ore belt. Based on field investigation, the authors figured out the prospecting criteria of trace elements by multivariate statistical methods and, in combination with geochemical parameters information, counted out the axial zonation of the ore deposit, built the ideal zoning model of the primary superimposed halos, constructed criteria for evaluating the ore potential in depth and clearly indicated the orientation in search for deep orebodies. Some conclusions have been reached:(1)The ore-forming element Au is close to elements Ni, Co, Cu, Mn, Sb, Sn, and the axial zonation of the ore deposit from top to bottom is As-Bi-Mn-Pb-Sb-B-Sn-Cu-Co-Hg-Ni-Zn-Au-Ag-Mo. (2) The front halo elements and the rear halo elements are existent together, suggesting that the orebodies extend in the deeper place; furthermore, deep ore prospecting should be carried out in the NE direction of the ore bodies. (3) Indexes such as(B×As×Hg×Sb)D/(Mn×Ni×Co×Sn)D can be used to predict the ore potentials in the deep portions of the orebodies.
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Key words:
- zonation of primary halos /
- deep ore prospecting /
- Donggualin gold deposit /
- Yunnan
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