利用不同深度场源磁异常分离的方法解译隐伏岩体
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摘要
为了查明安徽省殷家汇地区隐伏岩体的赋存状况,初步圈定侵入性中酸性岩体的范围并推测有利赋矿位置,对地面实测磁异常进行化极、延拓、不同深度场源磁异常分离、垂向导数等数据处理,提取利于识别的剩余磁异常及垂向一阶导数磁异常,结合地质资料解译磁异常特征。结果表明:区内NE向剩余磁异常带为沿断裂构造侵入的脉岩引起,NE向构造为区内主要的控岩和控矿构造;推测引起局部剩余磁异常的磁性地质体为隐伏或半隐伏中酸性岩体。该研究为长江中下游铁铜金成矿带中的安庆—盱眙地质矿产调查区成矿远景区划分及找矿靶区初选提供参考。
In order to verify the occurrence status of concealed rock mass in Yinjiahui area of Anhui Province,and delineate the range of intrusive intermediate acid-acid rock mass and advantageous ore-bearing location,the author has polarized and continued the magnetic anomalies,and processed the anomaly separation of magnetic source from different depth fields and vertical derivative. The author has also extracted some useful information about residual magnetic anomalies and the first vertical derivative of magnetic anomalies. Combined with the magnetic anomalies characteristics based on geology data,the results show that the NE residual magnetic anomaly zone formed from the intruded vein along the fault and the NE fault is the main rock-control and ore-control structure.The author also concluded that magnetic geologicalbody,resulting in local residual magnetic anomalies,is concealed and semi-concealed intermediate acid-acid rock mass. This research would provide some reference for the division of geological survey and prospective metallogenic zones,and the outlining of prospecting targets in Anqing-Xuyi geological and mineral resources survey in middle and lower Yangtze metallogenic belt.
In order to verify the occurrence status of concealed rock mass in Yinjiahui area of Anhui Province,and delineate the range of intrusive intermediate acid-acid rock mass and advantageous ore-bearing location,the author has polarized and continued the magnetic anomalies,and processed the anomaly separation of magnetic source from different depth fields and vertical derivative. The author has also extracted some useful information about residual magnetic anomalies and the first vertical derivative of magnetic anomalies. Combined with the magnetic anomalies characteristics based on geology data,the results show that the NE residual magnetic anomaly zone formed from the intruded vein along the fault and the NE fault is the main rock-control and ore-control structure.The author also concluded that magnetic geologicalbody,resulting in local residual magnetic anomalies,is concealed and semi-concealed intermediate acid-acid rock mass. This research would provide some reference for the division of geological survey and prospective metallogenic zones,and the outlining of prospecting targets in Anqing-Xuyi geological and mineral resources survey in middle and lower Yangtze metallogenic belt.
引文
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[3]地质矿产部物化探研究所.安徽省安庆—贵池地区航空磁测成果报告[R]. 1991.
[4]牛宝童,廖圣柱,毕源清,等.长江中下游成矿带安庆—盱眙地区地质矿产调查:安徽贵池地区2017年度地面高精度磁法测量工作报告[R].合肥:安徽省地球物理地球化学勘查技术院,2017.
[5]李玉发,姜立富.安徽省岩石地层[M].武汉:中国地质大学出版社,1997.
[6]姚孝德,谭德兴,陈芳.安徽省池州地区区域成矿模式[J].安徽地质,2013(3):200-204.
[7]管志宁.地磁场与磁力勘探[M].北京:地质出版社,2005.
[8]何柳昌,产思维.徐宿弧(安徽段北部)弱磁异常特征及其认识[J].中国地质调查,2018,5(1):60-65.
[9]刘天佑.重磁异常反演理论与方法[M].武汉:中国地质大学出版社,1992.
[10] Reddy I K,Rankin D. Magnetotelluric response of a two-dimen-sional sloping contact by the finite element method[J]. Pure ApplGeophys,105(1):847-857.