| 皖南云岭金矿地球物理找矿模型 |
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| 引用本文： | 万 芬,王光杰,杨晓勇,胡祥云,林方丽,张云霞.皖南云岭金矿地球物理找矿模型[J].地球科学与环境学报,2014(1):185-192. |
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| 作者姓名： | 万 芬 王光杰 杨晓勇 胡祥云 林方丽 张云霞 |
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| 作者单位： | [1]中国地质大学 武汉 地球物理与空间信息学院,湖北武汉430074 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国科学技术大学 地球和空间科学学院,安徽合肥230026 |
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| 基金项目： | 中国科学院知识创新工程重大项目（KZCX1-YW-15-3,KZCX1-YW-15-4）;安徽省国土资源科技项目（2011-K-08）;国家自然科学基金项目（41173057） |
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| 摘 要： | 皖南云岭金矿位于长江中下游多金属成矿带与华南成矿带之间,属于江南造山带上的一个热液脉型矿床。基于云岭金矿区域地质背景,在该区开展了岩石露头测定、岩石标本物性测定和地球物理学相关研究。运用地面高精度磁测法,识别本区主要控矿构造为NE向断裂带。根据激发极化法圈定高极化率异常区,并结合相应区域电阻率(可控源音频大地电磁法)和磁异常分布特征建立4种地球物理模型:低阻-高极化模型、高阻-高极化模型、高极化-磁异常过渡带模型和高极化-高磁异常模型。这4种地球物理模型建立在该区岩石物性与矿床成因基础之上,分别对应不同含矿模型:低阻-高极化模型对应接触带上硫铁矿成矿区;高阻-高极化模型对应含矿硅化带;高极化-磁异常过渡带模型对应围岩蚀变带;高极化-高磁异常模型对应岩浆侵入区。依据以上模型,可圈定NE向断裂带、断裂带西侧高阻硅化带及东侧蚀变岩体为找矿有利靶区。
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| 关 键 词： | 地球物理学 金矿 找矿模型 硫铁矿 地面高精度磁测法 激发极化法 可控源音频大地电磁法 安徽 |
Geophysical Prospecting Models of Yunling Au Deposit in the Southern Anhui |
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| WAN Fen,WANG Guang-jie,YANG Xiao-yong,HU Xiang-yun,LIN Fang-li,ZHANG Yun-xia.Geophysical Prospecting Models of Yunling Au Deposit in the Southern Anhui[J].Journal of Earth Sciences and Environment,2014(1):185-192. |
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| Authors: | WAN Fen WANG Guang-jie YANG Xiao-yong HU Xiang-yun LIN Fang-li ZHANG Yun-xia |
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| Institution: | 1. School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China) |
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| Abstract: | Yunling Au deposit,which is located in the southern Anhui between polymetallic metallogenic belts of the middle-lower reach of Yangtze River and South China,is hydrothermal vein in Jiangnan orogenic belt.Based on the geological setting of Yunling Au deposit,the outcrop,physical property and geophysics of rocks were measured.The main ore-controlling structure is NE fault by the means of ground high-precision magnetic method.Four geophysical models are built according to the distributions of resistivity,magnetic anomaly and polarizability anomaly measured by ground high-precision magnetic method,controlled source audio-frequency magnetotelluric （CSAMT）and induced polarization method.The geophysical models include low-resistance and high-polarization, high-resistance and high-polarization, high-polarization and magnetic-anomaly transition, and high-polarization and high-magnetic-anomaly models. The models are established according to the physical property of rock and ore genesis in Yunling Au deposit,corresponding to the different ore-bearing models.Low-resistance and high-polarization model corresponds to pyrite metallogenic belt in contact zone;high-resistance and high-polarization model corresponds to ore-bearing silicified belt;high-polarization and magnetic-anomaly transition model corresponds to wall rock alteration zone;high-polarization and high-magnetic-anomaly model corresponds to magma intrusion zone.According to the models,the favorable prospecting targets in Yunling Au deposit are NE fault,high-resistance silicified belt in the west of fault and alteration intrusion in the east. |
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| Keywords: | geophysics Au deposit prospecting model pyrite ground high-precision magnetic method induced polarization method CSAMT Anhui |
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