甘肃省东大山铁矿地质—地球物理找矿模型研究  

The Study of Geological—geophysical Prospecting Model in Dongdashan Iron Ore of Gansu Province

作　　者：杜发 胥溢 谢志峰 张波 薛强强 

机构地区：[1]甘肃省地质矿产勘查开发局第二勘查院,甘肃兰州730020

出　　处：《工程地球物理学报》2017年第4期455-462,共8页Chinese Journal of Engineering Geophysics

摘　　要：作为沉积变质型磁铁矿床的代表,其找矿模型对同类型磁铁矿床勘查具有借鉴意义。为了研究东大山铁矿的地质-地球物理找矿模型,用以指导周边外围找矿,首先通过收集该矿区以往不同程度的勘查资料,总结出矿区及外围各类岩矿石的磁性特征,认为磁法是寻找该类矿床的最有效手段,可以采用1:5 000高精度磁法观测进行更深入的了解。然后采用位场延拓、垂向及水平导数等方法对采集的数据进行进一步的处理,通过勘探线剖面磁测数据2.5D重磁联合反演,查明了矿体赋存于单斜构造当中,呈薄层状多层整合产出,磁异常与矿体在三维空间位置上完全对应。最后,基于此构建出了东大山铁矿地质—地球物理找矿模型。该成果可用于指导其外围及隐伏矿床找矿工作,并且对矿床进行重新的评估。As the representative of the sedimentary metamorphic magnetite deposit,its prospecting model has a referential significance for the exploration of the same type of magnetite deposits.In order to study the geological—geophysical prospecting model of the Dongdashan iron mine used to guide the peripheral prospecting,this paper firstly sums up the magnetic characteristics of the ore in the mining area and the periphery by collecting the historical data of the mining area.It is considered that the magnetic method is the most effective method to find the ore deposit,and the 1：5000high precision magnetic method is used for the further understanding.Then the methods of field continuation,vertical and horizontal derivative are used to further process the collected data.Through the joint inversion of magnetic data 2.5Dheavy magnetic in exploration line profile,it is found that theorebody is deposited in the single oblique structure,which is a thin layer of multi-layer integration output,and the magnetic anomaly and the orebody are completely corresponding in the three-dimensional space position.In the end,based on this,the geological—geophysical prospecting model of the Dongdashan iron mine is constructed,and the results would be used to guide the prospecting work of the periphery and concealed ore deposits and would give the reassessment for the deposits.

关 键 词：东大山铁矿 地质-地球物理 找矿模型 沉积变质型磁铁矿 控矿因素 

分 类 号：P631.2[天文地球—地质矿产勘探]