新城金矿构造控矿及矿体三维定位预测
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摘要
新城金矿是上世纪七十年代胶东地区发现的特大型“焦家式”金矿床之一。矿区地质勘探工作侧重于开发和生产,而对矿区的综合地质,构造控矿规律等重要地质问题的研究较为停滞,导致新城金矿逐渐成为资源中度危机矿山。矿区勘探开发以竖井和坑道工程为主,且新城金矿主体部分为隐伏型矿床,因此充分利用已有地表和地下成矿信息,采用新技术、方法开展深部和外围构造控矿和矿体定位预测研究较为紧迫。
论文以野外地质观测和矿区资料收集为基础,依托于山东玲珑矿田和新城金矿预测新技术、新方法示范项目,综合分析新城金矿的成矿背景、地质特征、控矿构造规律和矿体产出特征,然后利用Surpac软件建立三维矿体模型,并进而探讨了其矿体定位规律,最终进行成矿预测。取得如下认识：
1.焦家断裂以及次级断裂共同构成了矿区的控矿断裂系统。矿床赋存于主断裂面下盘的玲珑花岗岩体。焦家断裂是成矿流体运移通道,也是成矿流体汇聚场所；主断裂面呈现出波状起伏特点,使成矿的有利部位分布具有波状相间的似等距分布特点；断裂破碎强度大、主断裂面产状、形态变化部位和断裂分枝交汇部位、次级断裂以及密集节理带中,矿化富集。主断裂在成矿期表现为右行剪切作用为主,并形成了有利矿化的强破碎带、伴生次级断裂及密集节理带向南西侧伏,从而控制矿体的侧伏规律。焦家断裂,经历多次构造活动的叠加,断裂构造岩发育,断裂带内岩石破碎强度大,孔隙度大,成矿流体可在其中渗流,形成构造蚀变岩型金矿床,蚀变带总是沿着主断裂面呈带状展布。
2.本文主要选择矿区111’-195’勘探线以及-10m--630m中段标高的范围内地质数据1034个,在Surpac软件中,建立新城矿区地质数据库,构建基于钻孔数据的矿体实体模型,断裂模型。利用品位数据建立块体模型,在此基础上,采用地质统计法和距离幂次反比法进行品位估值和储量计算。
3.在三维矿体模型的基础上结合矿体产出规律,采用趋势外推法和类比法,对新城金矿Ⅰ、Ⅴ号矿体三维定位预测,分别圈定了预测靶区。Ⅰ号矿体预测靶区位于Ⅰ号矿体深部南西侧伏向下延部分,主要分布区域为：水平范围在111’-147’勘探线之间,垂向标高在-500m--900m内,矿体形态呈薄板状。Ⅴ号矿脉群预测靶区位于Ⅴ号矿脉群南西侧伏的延深部位,主要分布区域为：水平范围在147’-171’勘探线之间,垂向标高在-700m--1000m,侧伏角45。左右,距Ⅰ号矿体垂直距离85m,与Ⅰ号矿体相平行。
Gold deopists in Xincheng are one of the largest gold deposits in 70s of tha last century in China, which is "Jiaojia Type" gold deposits in Northwestern Shandong Province. The geological explration work focused on the development and production, however, the comprehensive geological studies of the mining, the ore controlling factors'researh developed slowly, which gradually caused the middle degree crisis mines. Prospecting and exploration of the mining areas are controlled by shaft project, and main part of orebodys are concealed ore deposits. Therefore we urgent need to make full use of existing ground and underground mine forming information, new technology, new methods to develop structure and study of the steroprediction of orebody location in depth and outlying.
Basing on the geological field observations and exploring-mining documentation and relying on the Shandong Linglong gold ore field and Xincheng gold deposit technologies and new methods demonstration project, the paper analysed comprehensively geological characteristics, ore-controlling structures and ore output rule of its ore body positionning, and then used Surpac software to create 3D-model of the orebody, studied orebody distribution regularities, and prospected the most advantageous targets for new bodies. Specific studies are summarized as follows:
1.Jiaojia fault and secondary faults constitute the ore mining area fault system. The mined ore bodies are hosted in the altered Linglong granite which located on the footwall of the Jiaojia fault. Jiaojia fault is the ore-forming fluid migration channels, but also a ore-forming fluid gathering place. The main fault have wavy features, so that distribution of mineralization in the favorable positions may offset disribution like wave. The intensity of faults and fracture, the main occurrence of the fracture, position of changes and fracture intersection branch location, secondary faults and dense joints zone, which are mineralization. The main fault were formed by Dextral shear movement, and formed a strong favorable mineralized fracture zone, secondary faults and dense joints are pitch to EW, which controled the pitching derection of orebodies. Jiaojia fracture experienced the superposition of several tectonic activity. They are rich in fractural tectonites and the intensity of rock fragmentations in fracture zone, ore-forming fluid are transfusion among them, forming structural altered-rock type gold deposit, the altered-rock occurres along the interface of Jiaojia fracture.
2.In this paper, we choosed mine 111'-195' prospection line and -10m--630m level', and 1034 geology data. The use of software Surpac established geological database of Xincheng gold deposit, construsting 3D-modeling of orebodies based on drill hole data, and fracture model. Meanwhil, we have adopted geology statistics law and Inverse Distance Weighted Method in the estimation of ore body's grade and reserves of mine resources.
3.Through three-dimensional position forecast, summarizing up the outputs rules, we used application of trend extending method, which realized the steroprediction of No.Ⅰand No.Ⅴorebodies location respectively. No.Ⅰtarget prediction group pitch NE in the deepth of No.Ⅰorebody, main distribution area are:the level of 111'-147' prospection line and vertical:-10m--630m level, and ore body was thin plate shaped. No.Ⅴtarget prediction group pitch NE in the deepth of No.Ⅴ, main distribution area are:the level of 147'-171' prospection line and vertical:-700m--1000m level, pitch angle about 45°. The vertical distance from the ore body No.Ⅰis 85m, and is paralleled No.Ⅰ.
论文以野外地质观测和矿区资料收集为基础,依托于山东玲珑矿田和新城金矿预测新技术、新方法示范项目,综合分析新城金矿的成矿背景、地质特征、控矿构造规律和矿体产出特征,然后利用Surpac软件建立三维矿体模型,并进而探讨了其矿体定位规律,最终进行成矿预测。取得如下认识：
1.焦家断裂以及次级断裂共同构成了矿区的控矿断裂系统。矿床赋存于主断裂面下盘的玲珑花岗岩体。焦家断裂是成矿流体运移通道,也是成矿流体汇聚场所；主断裂面呈现出波状起伏特点,使成矿的有利部位分布具有波状相间的似等距分布特点；断裂破碎强度大、主断裂面产状、形态变化部位和断裂分枝交汇部位、次级断裂以及密集节理带中,矿化富集。主断裂在成矿期表现为右行剪切作用为主,并形成了有利矿化的强破碎带、伴生次级断裂及密集节理带向南西侧伏,从而控制矿体的侧伏规律。焦家断裂,经历多次构造活动的叠加,断裂构造岩发育,断裂带内岩石破碎强度大,孔隙度大,成矿流体可在其中渗流,形成构造蚀变岩型金矿床,蚀变带总是沿着主断裂面呈带状展布。
2.本文主要选择矿区111’-195’勘探线以及-10m--630m中段标高的范围内地质数据1034个,在Surpac软件中,建立新城矿区地质数据库,构建基于钻孔数据的矿体实体模型,断裂模型。利用品位数据建立块体模型,在此基础上,采用地质统计法和距离幂次反比法进行品位估值和储量计算。
3.在三维矿体模型的基础上结合矿体产出规律,采用趋势外推法和类比法,对新城金矿Ⅰ、Ⅴ号矿体三维定位预测,分别圈定了预测靶区。Ⅰ号矿体预测靶区位于Ⅰ号矿体深部南西侧伏向下延部分,主要分布区域为：水平范围在111’-147’勘探线之间,垂向标高在-500m--900m内,矿体形态呈薄板状。Ⅴ号矿脉群预测靶区位于Ⅴ号矿脉群南西侧伏的延深部位,主要分布区域为：水平范围在147’-171’勘探线之间,垂向标高在-700m--1000m,侧伏角45。左右,距Ⅰ号矿体垂直距离85m,与Ⅰ号矿体相平行。
Gold deopists in Xincheng are one of the largest gold deposits in 70s of tha last century in China, which is "Jiaojia Type" gold deposits in Northwestern Shandong Province. The geological explration work focused on the development and production, however, the comprehensive geological studies of the mining, the ore controlling factors'researh developed slowly, which gradually caused the middle degree crisis mines. Prospecting and exploration of the mining areas are controlled by shaft project, and main part of orebodys are concealed ore deposits. Therefore we urgent need to make full use of existing ground and underground mine forming information, new technology, new methods to develop structure and study of the steroprediction of orebody location in depth and outlying.
Basing on the geological field observations and exploring-mining documentation and relying on the Shandong Linglong gold ore field and Xincheng gold deposit technologies and new methods demonstration project, the paper analysed comprehensively geological characteristics, ore-controlling structures and ore output rule of its ore body positionning, and then used Surpac software to create 3D-model of the orebody, studied orebody distribution regularities, and prospected the most advantageous targets for new bodies. Specific studies are summarized as follows:
1.Jiaojia fault and secondary faults constitute the ore mining area fault system. The mined ore bodies are hosted in the altered Linglong granite which located on the footwall of the Jiaojia fault. Jiaojia fault is the ore-forming fluid migration channels, but also a ore-forming fluid gathering place. The main fault have wavy features, so that distribution of mineralization in the favorable positions may offset disribution like wave. The intensity of faults and fracture, the main occurrence of the fracture, position of changes and fracture intersection branch location, secondary faults and dense joints zone, which are mineralization. The main fault were formed by Dextral shear movement, and formed a strong favorable mineralized fracture zone, secondary faults and dense joints are pitch to EW, which controled the pitching derection of orebodies. Jiaojia fracture experienced the superposition of several tectonic activity. They are rich in fractural tectonites and the intensity of rock fragmentations in fracture zone, ore-forming fluid are transfusion among them, forming structural altered-rock type gold deposit, the altered-rock occurres along the interface of Jiaojia fracture.
2.In this paper, we choosed mine 111'-195' prospection line and -10m--630m level', and 1034 geology data. The use of software Surpac established geological database of Xincheng gold deposit, construsting 3D-modeling of orebodies based on drill hole data, and fracture model. Meanwhil, we have adopted geology statistics law and Inverse Distance Weighted Method in the estimation of ore body's grade and reserves of mine resources.
3.Through three-dimensional position forecast, summarizing up the outputs rules, we used application of trend extending method, which realized the steroprediction of No.Ⅰand No.Ⅴorebodies location respectively. No.Ⅰtarget prediction group pitch NE in the deepth of No.Ⅰorebody, main distribution area are:the level of 111'-147' prospection line and vertical:-10m--630m level, and ore body was thin plate shaped. No.Ⅴtarget prediction group pitch NE in the deepth of No.Ⅴ, main distribution area are:the level of 147'-171' prospection line and vertical:-700m--1000m level, pitch angle about 45°. The vertical distance from the ore body No.Ⅰis 85m, and is paralleled No.Ⅰ.
引文
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