| 南秦岭柞水—山阳矿集区金铜矿床成矿规律与找矿方向 |
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| 引用本文： | 王瑞廷,冀月飞,成欢,刘凯,张启,李弦,任涛.南秦岭柞水—山阳矿集区金铜矿床成矿规律与找矿方向[J].现代地质,2021,35(6):1487-1503. |
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| 作者姓名： | 王瑞廷 冀月飞 成欢 刘凯 张启 李弦 任涛 |
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| 作者单位： | 1.陕西省矿产资源综合利用工程技术研究中心,陕西 西安 7100542.西北有色地质矿业集团有限公司,陕西 西安 7100543.西北有色地质矿业集团有限公司院士专家工作站,陕西 西安 7100544.长安大学 地球科学与资源学院,陕西 西安 7100545.商洛西北有色七一三总队有限公司,陕西 商洛 726000 |
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| 基金项目： | 中国地质调查局项目“矿集区矿产调查和深部找矿预测”(DD20190570-2020-05) |
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| 摘 要： | 南秦岭柞水—山阳矿集区地质构造和岩浆活动强烈,矿床(点)成群成带分布,成矿条件良好。在长期找矿实践、成矿地质背景分析和典型矿床解剖的基础上,综合研究认为,区内金矿主要受EW向断裂或EW向韧-脆性剪切带与NE向张扭性叠加构造控制,寒武系水沟口组、泥盆系星红铺组与大枫沟组是金的赋矿地层。金矿体呈近EW向大致等间距展布,单个矿体在延伸方向呈透镜状、哑铃状、囊状等,具尖灭再现特征,构造叠加部位矿体厚大、品位较高。区内金矿床类型多为中-低温热液型、远成低温热液型,成矿时代为印支—燕山期。夏家店等已知金矿床深部及外围、区域断裂旁侧次级近EW向与NNE向断裂交汇部位、构造转折端、构造虚脱部位等是寻找金矿的有利靶区。铜矿分布于山阳—凤镇大断裂两侧,成矿类型以斑岩型-矽卡岩型为主,构造热液改造型、隐爆角砾岩型次之。斑岩型-矽卡岩型铜(钼)矿受燕山期构造-岩浆活动控制,赋存于燕山期斑岩体与围岩接触带内;矿体产状多受岩体与围岩接触面控制,呈似层状、透镜状产出。燕山期中酸性小岩体及其与围岩的接触部位、东西向三级断裂带附近是寻找铜(钼)矿的首选靶区。本次研究建立了柞水—山阳矿集区金铜矿床区域成矿模式,总结了找矿标志,通过成矿规律、成矿作用及物探、化探、遥感异常特征系统分析,认为区内找矿潜力巨大,并提出了3片金铜(钼)成矿远景区,指出下一步的找矿方向。
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| 关 键 词： | 柞水—山阳矿集区 成矿规律 找矿方向 找矿标志 夏家店金矿 池沟铜(钼)矿 |
| 收稿时间： | 2021-06-28 |
| 修稿时间： | 2021-10-31 |
Metallogenic Regularities and Future Prospecting Direction of Gold-Copper Deposits in the Zhashui-Shanyang Orefield,Southern Qinling Orogen |
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| WANG Ruiting,JI Yuefei,CHENG Huan,LIU Kai,ZHANG Qi,LI Xian,REN Tao.Metallogenic Regularities and Future Prospecting Direction of Gold-Copper Deposits in the Zhashui-Shanyang Orefield,Southern Qinling Orogen[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(6):1487-1503. |
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| Authors: | WANG Ruiting JI Yuefei CHENG Huan LIU Kai ZHANG Qi LI Xian REN Tao |
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| Abstract: | In the Zhashui-Shanyang orefield (Southern Qinling Orogen),structure deformation and magmatic activity were strong,and the ore deposits (prospects) are distributed in groups and belts,and the metallogenic conditions are favorable. Based on long-term prospecting practice, analysis of geological and metallogenic setting and typical deposit profiles,we considered that local gold deposits are mainly controlled by EW-trending faults or ductile-brittle shear zones and NE-trending tensional-torsional superimposed structure.The Cambrian Shuigou, Devonian Xinhongpu and Dafenggou Formations are the gold-bearing strata. The gold orebodies are distributed approximately equidistant from east to west,and individual orebodies are lenticular, dumbbell-shaped or vesicular along strike.The orebodies are characterized by pinch-out reproduction, and thick and high-grade in the structurally superimposed area. Local gold deposits are mostly of meso epithermal hydrothermal type and distal low- temperature hydrothermal type. The metallogenic epoch is Indosinian-Yanshanian period. The deep and periphery,the intersection of EW and NNE trending faults near the secondary regional faults,the fault bends and the structural collapse sites are favorable targets for gold prospecting at Xiajiadian and in other known gold deposits. The copper deposits are distributed on both sides of the Sanyang-Fengzhen fault. The main metallogenic type is porphyry-skarn type,followed by tectono-hydrothermal transformation type and cryptoexplosive breccia type. Porphyry-skarn Cu(Mo) deposits are controlled by the Yanshanian tectono-magmatic activity. Occurring in the contact zone between porphyry body and wallrock in the Yanshanian period,the orebodies are mostly controlled by the contact between intrusions and wallrocks,and appear as layers or lenses. The small intermediate felsic stock and their contact with the Yanshanian wallrocks, and the vicinity of the EW 3rd order fault zone are preferred targets for Cu (Mo) exploration. In this study,the regional metallogenic model of the gold-copper deposits is established,and the prospecting criteria are summarized for the Zhashui-Sanyang orefield. Based on the systematic analysis of metallogenic regularity, mineralization,geophysical/geochemical prospecting,and remote sensing anomalies,we considered that there is great ore prospecting potential, and we proposed three Au-Cu(Mo) prospecting areas,as well as the future prospecting directions. |
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| Keywords: | Zhashui-Shanyang orefield metallogenic regularity exploration direction prospecting criteria Xiajiadian Au deposit Chigou Cu(-Mo) ore deposit |
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