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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (3): 325-333.doi: 10.11872/j.issn.1005-2518.2021.03.070

• 矿产勘查与资源评价 •    下一篇

辽宁排山楼金矿T4矿体Au元素富集规律及其对找矿的指示意义

刘彦兵1(),屈海浪1,胡博心1,缪广1,滕俊伟2,武昌胜2,王睿鹏2   

  1. 1.北京金有地质勘查有限责任公司,北京 100083
    2.辽宁排山楼黄金矿业有限责任公司,辽宁 阜新 123126
  • 收稿日期:2020-04-06 修回日期:2021-05-22 出版日期:2021-06-30 发布日期:2021-07-14
  • 作者简介:刘彦兵(1986-),男,陕西榆林人,高级工程师,从事金矿地质勘查及找矿研究工作。lyb01305114@163.com
  • 基金资助:
    中国黄金集团有限公司地质科研项目“ 辽宁排山楼金矿床成矿地质条件研究及深部和外围成矿预测”(WKY201601)

Enrichment Regularities of Au Element in T4 Orebody of the Paishanlou Gold Deposit in Liaoning Province and Its Indicative Significance for Prospecting

Yanbing LIU1(),Hailang QU1,Boxin HU1,Guang MIAO1,Junwei TENG2,Changsheng WU2,Ruipeng WANG2   

  1. 1.Beijing Jinyou Geological Exploration Co. ,Ltd. ,Beijing 100083,China
    2.Liaoning Paishanlou Gold Mining Co. ,Ltd. ,Fuxin 123126,Liaoning,China
  • Received:2020-04-06 Revised:2021-05-22 Online:2021-06-30 Published:2021-07-14

摘要:

排山楼金矿位于华北地台北缘,为受控于韧性剪切带的大型金矿床。该矿床成因与韧性剪切带密切相关,矿区成矿地质条件优越,具有很好的找矿潜力。通过总结排山楼金矿地质特征及其主要控矿因素,认为区内韧性剪切带为控岩(控矿)构造,控制着赋矿糜棱岩和金矿体的空间展布,向矿区深部赋矿岩石变薄,找矿空间变小。通过分析T4矿体的品位和厚度分布规律发现,矿体厚度及品位分布规律在空间上表现出高度一致性,根据金品位等值线图判断矿体向南西侧伏。研究认为T4矿体在南西深部其厚度及品位降低趋势明显,向深部工业价值不大,应重点加强对其他韧性剪切带找矿潜力的研究。

关键词: 韧性剪切带, 成矿地质条件, 控矿因素, Au元素富集规律, 深部找矿潜力, 排山楼金矿, 辽宁省

Abstract:

The Paishanlou gold deposit is located in the gold province of northern margin of North China Craton,which is the third largest gold province in China.The deposit is mainly hosted in metamorphic rocks of the Jianping Group of Archean and it is structurally controlled by two sets of ductile shear zones.Both the Paishanlou gold deposit in Liaoning Province and Hetai gold deposit in Guangdong Province were firstly been confirmed as ductile shear zone type gold deposits in China.The main orebody T4 in the mining area is controlled by the northeast trending ductile shear zone,and the host rocks are the biotite-plagioclase mylonite and felsic mylonite from Late Archean Jianping Group.The orebody lies in the most strongly deformed rocks in the ductile shear zone,and its hanging wall is dolomitic mylonite.Previous studies have shown that dolomitic mylonite plays a role as a geochemical barrier in the mineralizing process.The Yanshanian granite intruded into the ore-bearing Jianping Group.In this study,by summarizing the geological characteristics and main ore-controlling factors of the Paishanlou gold deposit,it is believed that the ductile shear zone in the area is a rock-controlling and ore-controlling structure,which controls the spatial distribution of the ore-bearing mylonite and gold ore bodies.Granite intrusion causes thinning of ore-bearing rocks which reduced prospecting space.The grade and thickness data of the ore-body T4 were collected in this study.By using the Surfer software to compile the grade and thickness contour maps,the distribution characteristics of the grade and thickness of the ore-body T4 were analyzed.It is considered that the grade and thickness of the ore-body T4 from the east end near the surface to the deep end of the west end can be divided into three obvious gradient zones,and the grade and thickness gradually decrease.The thickness and grade of the orebody shows spatially high consistency.According to the gold grade contour map,we judge that the orebody is leaning to the south and west,with a side leaning angle of 53°.It indicates that the thickness and grade of the orebody T4 in the southwest of the deep have a significant decrease.Therefore,there is no great potential to find economically important orebody in the southwest of the deep.It’s proposed to analyze and research the prospecting potential of other ductile shear zones in the mining area.

Key words: ductile shear zone, ore-forming geological conditions, ore-controlling factors, enrichment regularities of Au element, prospecting potential of deep area, Paishanlou gold deposit, Liaoning Province

中图分类号: 

  • P618.51

图1

辽宁省阜新市排山楼金矿区域地质图[据李友权等(2015)修改]1.第四系;2.白垩系孙家湾组;3.白垩系阜新组;4.长城系高于庄组;5.长城系大红峪组;6.长城系团山子组;7.太古宇建平群大营子组;8.侏罗纪二长花岗岩;9.侏罗纪正长花岗岩;10.燕山期大石头沟(斜长)花岗岩;11.晚太古代花岗岩和斜长花岗岩;12.韧性剪切带;13.断裂;14.金矿床(点)及名称"

图2

排山楼金矿200 m中段地质简图1.长英质糜棱岩;2.黑云斜长糜棱岩;3.黑云斜长初糜棱岩;4.白云质糜棱岩;5.糜棱岩化黑云斜长片麻岩;6.似斑状黑云母二长花岗岩;7.矿体及编号;8.断层"

图3

排山楼金矿T4矿体垂直纵投影金品位等值线图注:蓝色虚线代表Au元素富集带界线,黑色虚线代表Au元素次级等值线长轴方向,红色虚线代表金矿体侧伏方向"

图4

排山楼金矿T4矿体垂直纵投影厚度等值线图"

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