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.
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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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