摘要
本文以探寻华北陆块南缘更多铁矿资源为目地,对区内铁矿类型及重磁场特征进行了总结分析,分别建立了不同类型铁矿成矿要素的重磁异常识别标志:沉积变质型铁矿-局部重磁异常双高;接触交代型铁矿-区域重力高异常上局部磁异常梯级带;岩浆岩型铁矿-局部低重力异常上的高磁异常或磁异常梯级带;沉积型铁矿-平缓的高低重力异常过渡带中局部高重力异常,所做工作为区内找铁矿工作提供了进一步的找矿方向。
To improve the iron ore resources assets in the southern margin of the north china craton,we carry out study on ore type and the features of gravity-magnetic field.Markings for the gravity and magnetic anomalies were different established for ore-forming factors of iron deposits:Sedimentary metamorphic iron ore-local gravity and magnetic anomaly double height;Contact metasomatic iron ore-local magnetic anomaly cascading belt on top of regional gravity high anomaly;Magmatic iron ore-high magnetic anomaly or magnetic anomaly cascade belt on local low gravity anomaly;Sedimentary iron ore-gentle transition zone of positive bearing magnetic anomaly.Based on it,sieving of local comprehensive anomalies are effective methods in search for concealed ore deposits.
作者
滕菲
孟庆龙
邢怡
TENG Fei;MENG Qing-long;XING Yi(TianJin Center,China geological survey,Tianjin 300170,China;North China Center for Geoscience Innovation,Tianjin 300170,China;Exploration&Development Research Institute of Dagang Oil Field,Tianjin 300280,China)
出处
《华北地质》
2021年第3期70-76,共7页
North China Geology
基金
中国地质调查局项目“燕山-太行成矿带丰宁和天镇地区地质矿产调查(DD201600042)”。
关键词
华北陆块南缘
铁矿资源潜力评价
重磁场特征
找矿标志
成矿预测
the southern margin of the North China Craton
evaluation of iron ore resource potential
gravity and magnetic field
prospecting marks
metallogenic prognosis
