| 基于重、磁、电法的多宝山矿集区隐伏斑岩体识别与深部找矿实践 |
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| 引用本文： | 赵理芳,李希元,李成立,赵俊康,包怡,陈中,刘和花,梁杰,王佩业.基于重、磁、电法的多宝山矿集区隐伏斑岩体识别与深部找矿实践[J].矿床地质,2022,41(6):1217-1231. |
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| 作者姓名： | 赵理芳 李希元 李成立 赵俊康 包怡 陈中 刘和花 梁杰 王佩业 |
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| 作者单位： | 江苏省有色金属华东地质勘查局八一四队, 江苏 镇江 212004;江苏省地质局, 江苏 南京 210018;长江大学地球科学学院, 湖北 武汉 430100;中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110000;紫金矿业集团股份有限公司矿产地质勘查院, 福建 厦门 361000 |
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| 基金项目： | 本文得到国家重点研发计划“北方东部复合造山成矿系统深部结构与成矿过程”（编号：2017YFC0601300）和江苏省有色金属华东地质勘查局2019年度基础研究专项资金项目（编号：HDYS-KY2019-02）联合资助 |
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| 摘 要： | 斑岩体的存在是斑岩型铜矿重要的特征，查明隐伏斑岩体对于斑岩铜矿找矿预测有着重要的意义。文章以多宝山矿集区的岩石标本物性特征为基础，对重力、磁法、广域电磁法资料进行了处理和分析，根据矿化蚀变中心一般位于斑岩体顶部和矿化蚀变具有电阻率显著降低的特征，从已知到未知，对多宝山铜矿、铜山铜矿和争光金矿的隐伏花岗闪长斑岩体进行了识别，进而推断出矿体位置。根据电性异常特征推测：多宝山铜矿可以扩大外围找矿部署，铜山铜矿矿体有往下延伸的趋势，隐伏斑岩体南侧可能存在大型矿体；争光金矿深部可能存在斑岩型铜矿。多宝山铜矿、铜山铜矿、争光金矿同属斑岩型铜矿系统，多宝山矿集区具“上金下铜”的成矿特征。钻孔揭示了铜山矿区隐伏斑岩体南侧矿体的存在，新增资源量达到大型矿床规模。证实了方法的有效性，同时也显示出矿集区矿产资源潜力巨大。
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| 关 键 词： | 地球物理 重力 磁法 广域电磁法 隐伏斑岩体 多宝山矿集区 |
| 收稿时间： | 2021/11/11 0:00:00 |
| 修稿时间： | 2022/10/26 0:00:00 |
Recognition of concealed porphyry body and deep prospecting practice in Duobaoshan ore concentration area based on gravity, magnetic and electromagnetic surveys |
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| ZHAO LiFang,LI XiYuan,LI ChengLi,ZHAO JunKang,BAO Yi,CHEN Zhong,LIU HeHu,LIANG Jie,WANG PeiYe.Recognition of concealed porphyry body and deep prospecting practice in Duobaoshan ore concentration area based on gravity, magnetic and electromagnetic surveys[J].Mineral Deposits,2022,41(6):1217-1231. |
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| Authors: | ZHAO LiFang LI XiYuan LI ChengLi ZHAO JunKang BAO Yi CHEN Zhong LIU HeHu LIANG Jie WANG PeiYe |
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| Institution: | Team 814 of East China Non-ferrous Metals Geological Exploration Bureau of Jiangsu Province, Zhenjiang 212004, Jiangsu, China;Jiangsu Geological Bureau, Nanjing 210018, Jiangsu, China;College of the Earth Sciences, Yangtze University, Wuhan 430100, Hubei, China;CGS Shenyang Geological Survey Center, Shenyang 110034, Liaoning, China;Zijin Mining Group Co., Ltd Geological Prospecting Institute, Xiameng 361000, Fujian, China |
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| Abstract: | The existence of porphyry intrusive body is an important feature of porphyry copper deposit. Finding out the concealed porphyry body is of great significance for the prospecting and prediction of porphyry copper deposit. Based on the physical properties of rock samples from the Duobaoshan ore concentration area, this paper processes and analyzes the data of gravity, magnetic and wide field electromagnetic surveys. According to the characteristics that the mineralized alteration center is generally located at the top of the porphyry body and the mineralization related alteration significantly reduces the resistivity, from known to unknown, the concealed granodiorite porphyries were identified at Duobaoshan copper mine, Tongshan copper mine and Zhengguang gold mine, and then the location of the ore body was inferred. According to the characteristics of electrical anomaly, it is speculated that the prospecting deployment at Duobaoshan copper mine can expand to its peripheral area, the ore body of the Tongshan copper mine tends to extend downward, and there may be a large ore body in the south of concealed porphyry. There may also be porphyry copper deposits in the deep part of the Zhengguang gold mine. Duobaoshan copper deposit, Tongshan copper deposit and Zhengguang gold deposit belong to porphyry copper deposit system, there could be metallogenic characteristics of "upper gold and lower copper" in the Duobaoshan ore concentration area. The borehole revealed the existence of ore body on the south side of the concealed porphyry in Tongshan mining area, and the newly increased mineral resources reached the scale of large deposits, which confirmed the effectiveness of the methods and showed that the mineral potential of the ore concentration area was huge. |
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| Keywords: | geophysics gravity magnetic method wide field electromagnetic method concealed porphyry Duobaoshan ore concentration area |
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