The characteristics of vertical primary halo zoning in the Louli gold deposit, Handan City, Hebei Province
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摘要:
娄里金矿位于邯郸洪山杂岩体北侧的火山凝灰岩中。该类型金矿在太行山南段为首次发现，其成矿规律和深部成矿潜力的研究对圈定成矿远景区及增加矿山资源量有重要的指导意义。据此系统采集了矿区ZK11-2和ZK16-1钻孔岩心样品，在分析区域成矿地质规律和矿床地质特征的基础上，采用格里戈良分带指数法和广义衬值法两种方法计算了元素垂向分带序列，结果显示不同方法虽在元素排列顺序上存在一定差异，但在反映热夜活动期次及元素空间叠加模式上基本相同。两个钻孔中均出现了明显的“前尾晕共存”及“反向分带”现象。在此基础上结合微量元素垂向变化规律，分析了区内金矿体形成的热夜活动过程。研究表明两个钻孔的垂向分带都由两个完整的小循环组成，说明区内金矿体的形成至少经历了两次热夜活动叠加。
Abstract:The Louli gold deposit is located on the northern side of Hongshan alkalic complex, and the host rock of the orebody is the volcanic tufa. This is the first ore deposit of such type found in volcanic tufa in the southern segment of the Taihang Mountain, and its metallogenic regularity and deep metallogenic prospect evaluation are of guiding significance for delineating potential prospective areas and increasing mineral resources. Based on the regional mineralization regularity and geological characteristics, the authors systematically collected rock samples in 2 drill holes, and used Gregorians zonality index method and generalized contrast value method to compute and determine vertical zoning sequence of indicator elements. The results show that different calculation methods may produce somewhat different element orders, but the active stages of hydrothermal fluid and spatial superposition mode of halos are identical. The computed result of two drill holes shows the obvious coexistence of frontal halo and tail halo and axial zoning characteristics. The active process of hydrothermal fluid was analyzed based on the trace elements geochemical parameter axial variation. The results obtained show that the vertical zoning of two drill holes are made up of two stage hydrothermal circulation, suggesting that the formation of gold deposit is of multi-stage characteristics.
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Keywords:
- primary halo /
- vertical zoning /
- gold deposit /
- Louli
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图 1 研究区地质简图
1—第四系；2—娄里组一段；3—娄里组二段；4—正长岩；5—巨斑状正长岩；6—黑云辉石粗面斑岩；7—粗粒黑云辉石正长岩；8—闪长岩；9—下石盒子组；10—断层；11—金矿床（点）
Figure 1. Simplified geological map of the study area
1-Quaternary; 2-First member of Louli Formation; 3-Second membert of Louli Formation; 4-Syenite; 5-Large porphyritic syenite; 6-Biotite-pyroxene trachy porphyry; 7-Coarse-grained biotitepyroxene trachy porphyry; 8-Diorite; 9-Shihezi Formation of Lower Permian; 10-Fault; 11-Gold deposit
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图 2 娄里矿区地质简图
1—第四系；2—白垩系娄里组二段；3—白垩系娄里组一段；4—正长斑岩脉；5—破碎带；6—蚀变岩；7—金矿体；8—断层及编号；9—钻孔位置及编号
Figure 2. Simplified geological map of the Louli gold ore district
1-Quaternary; 2-Second member of Cretaceous Louli Formation;3-First member of Cretaceous Louli Formation; 4-Syenite porphyry vein; 5-Fracture zone; 6-Altered rocks; 7-Gold orebody; 8-Fault and its serial number ; 9-Drill hole and its serial number
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图 3 矿区11 和16 号勘探线地质剖面略图
Figure 3. Geological cross-section along No.11 and No.16 exploration line in the Louli ore district
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图 4 娄里金矿区ZK11-2 钻孔元素轴向变化规律图
单位：Au、Hg为10-9；其余为10-6
Figure 4. Axial changing regularities of indicative elements of drill hole. ZK11-2
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图 5 娄里金矿区ZK16-1 钻孔元素轴向变化规律图
单位：Au、Hg为10-9；其余为10-6
Figure 5. Axial changing regularities of indicative elements of drill hole. ZK16-1
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图 6 娄里金矿体原生叠加晕模式示意图
Figure 6. Sschematic diagram of primary superimposed halo model of the Louli gold deposit
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