STUDY ON THE Q173 VEIN IN XIAOQINLING GOLD FIELD WITH THE METHOD OF STRUCTURE-ALTERATION-GEOCHEMISTRY PROSPECTING PREDICTION
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摘要: 运用构造-蚀变-构造叠加晕综合方法对陕西小秦岭金矿田Q173号矿脉进行了找矿预测研究。研究结果表明，Q173号矿脉控矿断裂主要经历了3次构造运动。成矿早期为压扭性右行剪切变形；成矿期首先经历了右行逆冲为主的脆性张扭性构造变形，之后又有一组北东向张扭性构造的复合叠加，形成了多金属矿化石英脉；成矿后期构造活动不明显，主要为一些正断层，未见明显矿化富集叠加。构造控矿规律研究认为矿体向西侧伏。围岩蚀变研究表明，与金矿化密切相关的蚀变组合为黄铁矿化-硅化-绢云母化；深部"构造叠加晕"异常特征指示有盲矿体存在。根据综合找矿预测方法研究成果，提出了Q173号矿脉西段侧伏区在1070 m标高以下尚有成矿富集地段的存在，可供工程进一步验证。Abstract: In this paper we use the comprehensive method of structure-alteration-structural superimposed halo to research the prospecting prediction of the Q173 vein in Xiaoqinling gold field, and we come to the following understanding that the controlling fracture of the Q173 vein mainly experienced three tectonic movements. In early mineralization compressoshear structure is the dextral shear deformation, and during the mineralization stage it first experiences brittle transtensional tectonic deformation of right lateral thrust and then undergoes a composite overlay of the NE-trending extensional tectonic, and eventually forms multi-metal quartz veins. Tectonic activity is not obvious in late mineralization stage with some normal faults and no obvious superimposed mineralization enrichment. Through studying the structural ore-controlling regularity, the ore body is considered to the west side. The wall rock alteration shows that the alteration assemblage closely related to gold mineralization is pyritization-silicification-sericitization. The anomalous characteristics of the structural superimposed halo in the deep indicate that the blind ore body is present. According to the research results with the comprehensive prospecting forecast method, there exists mineralization and enrichment areas in the west of Q173 vein below 1070 m elevation that can be verified by engineering someday.
- 致谢: 野外工作期间得到西藏自治区国土资源厅王保生厅长、河南地质勘查局区域地质调查院王建平院长、河南地质勘查局区域地质调查队刘彦明队长、白朝军高级工程师、王丰收工程师、贾共祥工程师的热情帮助和全力支持，使该项研究得以顺利进行; 研究工作中得到韩同林研究员、孙立蒨研究员、马天林研究员、钱方研究员、王建平研究员的具体指导，在此一并表示感谢。
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图 3 矿石结构类型及多金属矿化特征
Figure 3. Types of ore structure and the characteristics of multi-metal mineralization
图 4 金矿围岩蚀变镜下特征
14YJ1482—碎裂化含钾长石石英脉；14YJ1483—绢云母构造片岩；14YJ1491—构造片理化含黄铁矿绢云母蚀变岩；14YJ1492—铁碳酸盐化破碎石英脉(正交偏光镜下鉴定) Kfs—钾长石；Q—石英；Ser—绢云母；Py—黄铁矿；Cbn—碳酸盐；Cal—方解石；Pl—斜长石；Bi—黑云母
Figure 4. Microscopic characteristics of the alteration of surrounding rock
图 5 Q173矿脉近东西向构造带变形与矿化特征
Figure 5. Nearly EW-trending deformation of structural belt and mineralization characteristics of the Q173 Vein
图 6 Q173矿脉北东向构造带变形与矿化特征
Figure 6. NE-trending deformation of structural belt and mineralization characteristics of the Q173 Vein
图 7 Q173号矿脉两组不同方向上构造擦痕产状极密等值线图
Figure 7. Extremely dense contour map of structure striation in two different directions of the Q173 vein
图 8 Q173号矿脉1580中段沿走向变化规律
Figure 8. The change rule on the strike in the middle of 1580 of the Q173 vein
图 10 Q173号倾角变化与金品位变化关系
Figure 10. Relation between dip angle and gold grade of Vein Q173
图 11 Q173构造带内石英脉变形及矿化特征
Figure 11. Deformation and mineralization characteristics of quartz reef in the Q173 vein
图 14 Q173号矿脉Ⅱ号测线单元素地球化学异常图
Figure 14. Geochemical anomaly of single element in Ⅱ line of the Q173 vein
图 15 Q173号矿脉Ⅱ号测线不同标高地球化学参数叠加变化规律图
Figure 15. Geochemical anomaly of single element in Ⅱ line of the Q173 vein
表 1 Q173号矿脉断裂构造测量和应力分析
Table 1. Fault structure measurement and stress analysis of Q173 vein
断裂方向 主断面产状 主应力(σ1、σ2、σ3)方向 上升盘滑动方向(L) 主裂面扭动 图示 平面 剖面 东西向 177°∠58° σ1：135°∠12°
σ2：233°∠33°
σ3：1°∠43°12°∠25° 右 右 
北东向 120°∠50° σ1：348°∠2°
σ2：79°∠39°
σ3：256°∠51°2°∠45° 左 左 
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