构造-蚀变-地球化学综合找矿预测方法研究——以陕西小秦岭金矿田Q173号矿脉为例

张欢欢; 白和; 王和平; 文月贵; 韩舫; 杨优望; 牟培吉

构造-蚀变-地球化学综合找矿预测方法研究——以陕西小秦岭金矿田Q173号矿脉为例

张欢欢^1,,
白和^{1, 2},
王和平¹,
文月贵¹,
韩舫¹,
杨优望¹,
牟培吉³

1.
陕西省地质矿产勘查开发局第六地质队, 西安 710611
2.
陕西省矿产资源勘查与综合利用重点实验室, 西安 710054
3.
中国地质大学(北京)地球科学与资源学院, 北京 100083

基金项目:

中国地质调查局整装勘查区基础地质调查与潜力评价工程子项目"陕西小秦岭金矿田深部及外围金矿整装勘查区找矿预测与技术应用示范" 12120114014101

详细信息

作者简介:
张欢欢(1987-), 男, 助理工程师, 主要从事小秦岭地区矿产勘查及研究工作。E-mail:zhanghuan07200720@126.com

中图分类号: P618.51
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出版历程
- 收稿日期: 2015-12-16
- 刊出日期: 2016-06-01

STUDY ON THE Q173 VEIN IN XIAOQINLING GOLD FIELD WITH THE METHOD OF STRUCTURE-ALTERATION-GEOCHEMISTRY PROSPECTING PREDICTION

1.
Sixth Geological Team of Geological and Mineral Exploration and Development Bureau, Xi'an 710611, China
2.
Key Laboratory of Exploration and Utilization of Mineral Resources, Xi'an 710054, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

摘要

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。
- 小秦岭 /
- 构造控矿 /
- 围岩蚀变 /
- 构造叠加晕 /
- 找矿预测
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.
- Xiaoqinling /
- the ore controlling structure /
- the wall rock alteration /
- structural superimposed halo /
- prospecting prediction

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图 1 陕西小秦岭金矿田区域地质简图

Figure 1. Regional geology of Xiaoqinling gold fields in Shaanxi

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图 2 Q173号矿脉矿区地质简图

Figure 2. Mining geology of Q173 vein

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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

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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

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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

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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

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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

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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

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图 9 Q173号矿脉地质剖面

Figure 9. Geological section of Vein Q173

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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

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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

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图 12 坑道中的两期石英脉

Figure 12. Two-stage quartz reef in gallery

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图 13 Q173号矿脉R型聚类分析图谱

Figure 13. R-type clustering analysis of the Q173 vein

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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

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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

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图 16 Q173号矿脉深部盲矿体预测图

Figure 16. Forecasting of deep blind ore in the Q173 vein

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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
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)	平面	剖面	图示
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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