从重磁场特征分析华北陆块南缘铁矿分布规律  

Study on the distribution laws of the iron deposits and the features of gravity-magnetic field in the southern margin of the North China Craton

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)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]华北地质科技创新中心,天津300170 [3]中国石油大港油田勘探开发研究院,天津300270

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)”。

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.

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 

分 类 号：P618.31[天文地球—矿床学] P631[天文地球—地质学]