辽东半岛五龙金矿床航空电磁场特征及找矿意义  

Characteristics of aero-electromagnetic field and its prospecting significance in the Wulong gold deposit,Liaodong Peninsula

作　　者：石连成[1,2] 骆燕 江民忠[1,2] 王志宏 朱琳[1] 陈伟 韩鹏辉[1,2] 陈志鹏 SHI Liancheng;LUO Yan;JIANG Minzhong;WANG Zhihong;ZHU Lin;CHEN Wei;HAN Penghui;CHEN Zhipeng(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang,050002;CNNC Key Laboratory of Uranium Resource Geophysical Exploration Technology,Shijiazhuang,050002)

机构地区：[1]核工业航测遥感中心,石家庄050002 [2]中核集团铀资源地球物理勘查技术中心(重点实验室),石家庄050002

出　　处：《地质学报》2020年第10期3106-3119,共14页Acta Geologica Sinica

基　　金：国家重点研发计划“深地资源勘查开采”重点专项“华北克拉通成矿系统的深部过程与成矿机理”(编号2016YFC0600100);核工业航测遥感中心自主科研项目(编号202003);中核集团集中研发项目“龙灿”示范工程科研项目(第二阶段)共同资助成果。

摘　　要：五龙金矿床位于五龙矿集区中部,是矿集区内规模大的石英脉型金矿。为查明矿集区深部构造及指导深部找矿预测,需结合深部地球物理资料综合分析研究。本文基于五龙矿集区航空探测任务,并结合其成矿地质特征,研究了五龙金矿在平面、剖面、空间等维度的航磁、航空TEM、航空大地电磁特征及其找矿意义。研究表明:平面上矿体位于鸡心沟断裂东侧负磁背景场中NE与近SN、NW向弱磁异常带交汇处,中等-强剩余磁异常带的转折端、梯度带,视电阻率低阻区及中低阻梯度带,深部存在团块状视磁化率高值区;剖面上矿体位于"左低右高,上高下低"的视电阻率梯度带上,呈中低阻、低阻特征及强磁场区至弱磁场区的视磁化率梯度带上,呈浅部"上高下低"、深部"下高上低"的中等-弱磁特征;空间上矿体位于鸡心沟断裂东侧的断裂构造低阻带与岩体高阻异常带的梯度带。五龙金矿地质地球物理找矿标志的建立和深部高视磁化率异常区的存在,表明矿区深部1000~2000m空间与五龙金矿体视电阻率、视磁化率特征相似的地段,仍具有较好找矿潜力。Wulong gold deposit is a large quartz vein type gold deposit located in the middle of the Wulong ore deposit cluster.In order to ascertain the deep structure of the ore deposit cluster and to successfully guide deep prospecting prediction,it is necessary to carry out comprehensive research on deep geophysical and metallogenic characteristics.Characteristics of aviation electromagnetic field and prospecting significance of Wulong ore deposit cluster were studied based on the aerial exploration data.The aeromagnetic,airborne electromagnetic and airborne magnetotelluric properties of the Wulong gold deposit were studied from plane,profile and space,and also included the metallogenic geological characteristics.The results of the study are as following:on the plane,the orebody is located at the intersection of weak magnetic anomaly zones in the negative magnetic background field area on the east side of Jixingou fault,the turn and gradient zone of medium—strong residual magnetic anomaly zone,the low resistivity zone of apparent resistivity,the middle and low resistivity gradient zone,and the mass high apparent magnetic susceptibility zone in the deep.On the profile,the orebody is located in the apparent resistivity gradient zone with medium and low resistance,the apparent susceptibility gradient zone with the medium—weak magnetic field which is lower right and higher left.In the space,the orebody is located in the gradient zone with low and high resistance.The establishment of geological and geophysical prospecting indicators and the existence of the deep high apparent magnetic susceptibility anomaly area in the Wulong gold deposit indicated that the deep mining area in the space of 1000~2000 m has good prospecting potential.However,the deep space should have similar characteristics of apparent resistivity and apparent magnetic susceptibility to the Wulong gold deposit.

关 键 词：五龙金矿床 航空电磁场特征 找矿意义 航空TEM 航空大地电磁 航磁 

分 类 号：P631.325[天文地球—地质矿产勘探] P618.51[天文地球—地质学]