| 秦岭凤太铅锌-金矿集区成矿规律与找矿预测 |
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| 引用本文： | 王瑞廷,张革利,李青锋,张斌,成欢,冀月飞.秦岭凤太铅锌-金矿集区成矿规律与找矿预测[J].地球科学与环境学报,2021(3):528-548. |
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| 作者姓名： | 王瑞廷 张革利 李青锋 张斌 成欢 冀月飞 |
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| 作者单位： | 陕西省矿产资源综合利用工程技术研究中心;西北有色地质矿业集团有限公司;长安大学地球科学与资源学院;宝鸡西北有色七一七总队有限公司 |
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| 基金项目： | 中国地质调查局地质调查项目(DD20160052-13)。 |
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| 摘 要： | 凤太铅锌-金矿集区地处秦岭泥盆系贵金属-多金属成矿带西段,总体为夹持于湘子河断裂、酒奠梁断裂之间,以NWW向褶皱和NWW向断裂组合而成的近似菱形构造块体,主要出露的泥盆系为浅变质碳酸盐岩与细碎屑岩建造,东部出露的花红树坪岩体、西坝岩体和集中分布的岩脉为区内铅锌、金成矿提供了物质及热动力。典型矿床解剖结果表明:铅锌矿床受控于区域断裂及背斜构造且产出于特定的岩性层,与铅锌成矿关系密切的物理化学条件转换界面是中泥盆统古道岭组与上泥盆统星红铺组之间接触界面(硅钙面),铅锌矿床多位于面状高磁异常与低磁异常过渡部位并显示Pb-Zn-Hg-Cd组合化探异常,表明铅锌矿床成因类型为层控岩浆热液型;已知含矿背斜走向与倾向延伸部位、与其有相似成矿条件的次级背斜、大面积千枚岩覆盖区深部隐伏背斜的鞍部及倾斜部位是铅锌找矿有利地段。金矿床受控于断裂构造带或其旁侧的脆-韧性剪切带及其叠加部位,多位于高磁异常带中局部高磁异常向低磁异常过渡部位,与Au-Ag-(As-W-Bi-Sb)组合化探异常吻合度高,岩浆活动与金成矿关系密切,表明金矿床为中低温岩浆热液型;已探明大型金矿床近外围及深部是金找矿重点靶区。铅锌、金矿床均属于印支期与碰撞造山岩浆期后热液有关的铅锌、铜、金矿床成矿系列。基于成矿地质体、成矿构造、成矿结构面与矿体的相互作用与位置关系,建立了凤太铅锌-金矿集区铅锌、金成矿模式;叠加典型矿床物化探、遥感异常特征,构建找矿预测综合信息模型;采用“证据权法”,预测找矿靶区6处,说明区内找矿潜力大,下一步找矿工作重点是对隐伏控矿构造与隐伏矿体的预测与探索。
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| 关 键 词： | 铅锌矿床 金矿床 成矿规律 成矿模式 找矿潜力 靶区预测 硅钙面 秦岭 |
Metallogenic Regularity and Prospecting Prediction of Fengtai Pb-Zn-Au Ore Concentration Area in Qinling,China |
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| WANG Rui-ting,ZHANG Ge-li,LI Qing-feng,ZHANG Bin,CHENG Huan,JI Yue-fei.Metallogenic Regularity and Prospecting Prediction of Fengtai Pb-Zn-Au Ore Concentration Area in Qinling,China[J].Journal of Earth Sciences and Environment,2021(3):528-548. |
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| Authors: | WANG Rui-ting ZHANG Ge-li LI Qing-feng ZHANG Bin CHENG Huan JI Yue-fei |
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| Institution: | (Shaanxi Engineering Technology Research Center of Comprehensive Utilization of Mineral Resources,Xi an 710054,Shaanxi,China;Northwest Nonferrous Geological and Mining Group Co.,Ltd.,Xi an 710054,Shaanxi,China;School of Earth Science and Resources,Chang an University,Xi'an 710054,Shaanxi,China;Baoji No.717 Corps Limited of Northwest Nonferrous Geological and Mining Group,Baoji 721015,Shaanxi,China) |
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| Abstract: | The Fengtai Pb-Zn-Au ore concentration area is located in the western part of Devonian noble metal-polymetallic metallogenic belt,Qinling.The quasi-rhombic tectonic block,which is located between Xiangzihe fracture and Jiudianliang fracture,is composed of NWW-trending folds and NWW-trending faults.The main exposed Devonian is the formation of low-grade metamorphic carbonate rocks and fine clastic rocks.The Huahongshuping and Xiba rock masses,and the concentrated dikes,which are located in the eastern part of the ore concentration area,provide material and thermal power for the Pb-Zn-Au mineralization.The fine analysis of typical deposits show that the Pb-Zn deposits are controlled by regional fractures and anticlinal structures,and occur in specific lithological strata;the physical chemistry conversion interface,which is closely related to Pb-Zn mineralization,is the contact interface(silica-calcium interface)between Middle Devonian Gudaoling Formation and Upper Devonian Xinghongpu Formation;the Pb-Zn deposits are mainly located in the transitional region between planar high magnetic anomaly and low magnetic anomaly,and show Pb-Zn-Hg-Cd geochemical anomalies;the Pb-Zn deposit belongs to strata bound magmatic hydrothermal type;the favorable areas for Pb-Zn ore prospecting are the strike and dip extension of the known ore-bearing anticline,the secondary anticlines with similar ore-forming conditions,the saddle and tilt of deep concealed anticlines in the area with large covered phyllite.The Au deposits,which are controlled by the fracture structural belt or the brittle-ductile shear belt and its superposed position,are located in the transitional region from local high magnetic anomalies to low magnetic anomalies in the high magnetic anomaly belt;besides,the geochemical anomaly of Au deposit is in good agreement with that of Au-Ag-(As-W-Bi-Sb);Au mineralization is closely related to magma activity,and the Au deposit belongs to meso-low temperature magmatic hydrothermal type;the key target area for Au prospecting is near the periphery and deep part of the large-scale Au deposits.The Pb-Zn-Au deposits belong to the metallogenic series of Pb-Zn-Cu-Au related to Indosinian collisional orogeny magmatic post-hydrothermal solution.The Pb-Zn-Au metallogenic model in Fengtai Pb-Zn-Au ore concentration area is established based on the interaction and location of ore-forming geological body,ore-forming structure,oreforming structural plane and ore body.Superimposed on the geophysical,geochemical,remote sensing abnormal features of typical deposits,a comprehensive information model for ore prospecting and prediction is established.The“weight of evidence method”is used to predict the target areas.There are 6 ore prospecting target areas.It is considered that there is a great potential for ore prospecting in the area.The prospecting emphasis is to predict and explore the concealed ore-controlling structures and concealed ore bodies. |
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| Keywords: | Pb-Zn deposit Au deposit metallogenic regularity metallogenic model prospecting potential target prediction silica-calcium interface Qinling |
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