安徽庐江泥河铁矿的发现及意义  

Discovery of the Nihe Iron Deposit in Lujiang, Anhui, and its Exploration Significance

作　　者：吴明安[1] 汪青松 郑光文[1] 蔡晓兵[1] 杨世学[1] 狄勤松[1] 

机构地区：[1]安徽省地质调查院,合肥230001 [2]安徽省地质勘查技术研究院,合肥230001

出　　处：《地质学报》2011年第5期802-809,共8页Acta Geologica Sinica

基　　金：中国地质调查局国土资源大调查项目(编号1212010631701)资助的成果

摘　　要：泥河铁矿是在玢岩铁矿模式、大型矿集区成矿理论的指导下,通过系统分析和研究庐枞地区成矿地质条件和成矿规律,选择1∶5万航磁异常与重力异常套合地区,在1∶1万地磁测量基础上,利用钻探对磁异常进行验证而发现的,这一发现是长江中下游地区近20年来找矿的重大突破之一。勘探成果表明,泥河铁矿是一个由大型磁铁矿、大型硫铁矿、中型硬石膏矿组成的复合型矿床。泥河铁矿主要的赋矿围岩为上侏罗统砖桥组下段的火山碎屑岩及闪长玢岩,赋矿的有利构造为闪长玢岩体的穹状隆起部位。其围岩蚀变强烈,矿床成因类型为广义玢岩型铁矿。根据成矿条件和重磁异常,庐枞地区仍然具有重要的找矿远景,泥河主矿体东南部、泥河与罗河之间、矾母山-义津桥地区是今后铁矿找矿的重点地区。Under guidance of the model for porphyrite iron deposit and the metallogenic theory of the large-scale ore intensive areas,combined with systematic researches on the metallogenic characteristics and rule,the area delineated jointly by 1∶50000 aeromagnetic anomaly and gravity anomaly was the result of verification using drilling based on the 1∶10000 geomagnetic survey.This discovery is also one of the important breakthroughs in the Middle and Lower of Yangtze River two decades.Exploration results show that the Nihe iron deposit is a composite deposit consisting of one large-scale magnetite ore deposit,one large-scale magnetite-pyrite ore deposit and one medium-scale anhydrite ore deposit.The host rocks of the deposit,which are intensively altered,are volcanoclastic rocks and diorite porphyrite of the lower member of the Upper Jurassic Zhuanqiao Formation.Preferential ore-bearing structure is the doming section of the diorite porphyrite intrusion,with intensive alteration in country rocks.The Nihe iron deposit is genetically classified into the porphyrite iron deposit.According to the ore-forming conditions and aeromagnetic- gravity anomalies,the Luzong area is of the potential for exploration outlook.The southeastern region of the Nihe deposit,the region between the Nihe and Luohe deposit,and the Fanmushan-Yijinqiao region are the important regions for the iron exploration in the future.

关 键 词：重磁异常 找矿标志 找矿方向 泥河铁矿 庐江 

分 类 号：P618.31[天文地球—矿床学]