| 周顶,庄光军,李纲,张东林,李学虎,束永龙.湖北三天门金矿床原生晕轴向分带特征及深部矿体预测模型[J].矿产勘查,2014,5(6):897-905 |
| 湖北三天门金矿床原生晕轴向分带特征及深部矿体预测模型 |
| Characteristics of axial zoning of primary geochemcial halo and prediction model for deep gold orebody in the Santianmen gold deposit, Hubei |
| 投稿时间：2014-04-08 |
| DOI： |
| 中文关键词: 三天门 金矿床 原生晕 轴向分带 湖北 |
| 英文关键词: Santianmen gold deposit primary halo axial zonation Hubei |
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| 中文摘要: |
| 三天门金矿床位于秦岭—大别成矿带上,是近年来新发现的小型金矿床。通过对该矿床成晕元素共生组合及分带特征的研究,得出以下几点认识:(1)因子分析结果中,F1为Au、As、Sb主成矿因子,肯定了该区Au、Sb矿化的存在；(2)矿体原生晕发育,且分带明显,对比元素异常及矿体的空间分布特征,可以大致确定前缘元素为Sb、Pb、As,近矿元素为Au,尾晕元素为Cu、Ag、Bi；(3)由Gorigorian原生晕分带计算方法获得,原生晕轴向分带序列(自上而下)为:Pb→Sb→As→Au→Cu→Bi→Ag,该分带序列能较客观地反映出各元素在深部的相对浓集位置；(4)构建了深部矿体定量预测评价模型,该预测评价指标(Sb×As)D/(Cu×Bi)D在矿体头部(标高735 m)为1.88,矿体中部(标高615 m)为0.86,矿体尾部(标高430 m)为0.32,随着深度的增加急剧降低,是预测深部矿体定量评价模型的有效指标。 |
| 英文摘要: |
| The Santianmen deposit, located at the Qinling-Dabie metallogenic belt, is a newly discovered and small-sized gold deposit in recent years. By studying the association and zoning characteristics of geochemical halo elements in the deposit, it can be concluded as followings: (1) the result of factor analysis indicates that the main metallogenic factor F1 is Au, As and Sb, which is consistent with the existence of Au and Sb mineralization； (2) The primary halos of ore bodies were well developed, and the axial zoning is obvious. By comparing the geochemical anomalies of metallogenic elements with the spatial distribution of gold ore bodies, it can be roughly determined that the leading elements in the mineralization system are Sb, Pb and As, the indicator element is gold, and the trailing elements are Cu, Ag and Bi； (3) The axial zoning sequence of the primary halo as follows:Pb→Sb→As→Au→Cu→Bi→Ag (from the top to the bottom) based on the calculation result of Gorgorian’s zonal calculation approach, which can reflect the relative concentration position of each element at the depth respectively； (4) quantitative predication model was constructed for predication of the gold orebody at depth using the evaluation index of (Sb×As) D/(Cu×Bi). D is 1.88 when at the top of ore bodies (the elevation of 735 m), 0.86 at the middle of ore bodies (the elevation of 615 m) and 0.32 at the bottom of ore bodies (the elevation of 430 m). The index value decreases regularly and abruptly with depth, therefore it can be used as an effective indicator for predicting the orebody potential in depth quantitatively. |
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