地质-地球物理精细建模技术在庐枞下含山铁矿深部结构探测中的应用  

Application of geological-geophysical modeling technique in deep structural exploration of Xiahanshan iron deposit in the Luzong basin

作　　者：王云云 兰学毅 郭冬 陶龙 马冬[2] 丁文祥 张莎莎 叶林 李勇[2] WANG Yunyun;LAN Xueyi;GUO Dong;TAO Long;MA Dong;DING Wenxiang;ZHANG Shasha;YE Lin;LI Yong(Geological Exploration Technology Institute of Anhui Province(Energy Exploration Center),Hefei 230001,Anhui,China;No.326 Geological Team,Bureau of Geology and Mineral Exploration of Anhui Province,Anqing 246003,Anhui,China)

机构地区：[1]安徽省勘查技术院(安徽省地质矿产勘查局能源勘查中心),安徽合肥230001 [2]安徽省地质矿产勘查局326地质队,安徽安庆246003

出　　处：《华东地质》2021年第3期293-301,共9页East China Geology

基　　金：中国地质调查局“安徽庐枞地区1∶5万区域地质综合调查(编号:1212011220566)”项目资助。

摘　　要：为查明深部闪长岩及膏盐层与庐枞盆地内玢岩型铁矿的关系,指导盆地南西缘许家咀下含山地区的找矿工作,该文利用最新测量的重力、磁测数据,结合地表地质和钻探等先验信息,采用2.5D重磁联合反演方法建立地质地球物理精细模型,发现二长闪长岩侵入深度为-1200 m,岩体与中三叠统月山组接触部位发育带状膏盐层和磁铁矿化互层,类似于龙桥式矿化,表明庐枞盆地内铁矿化与闪长岩、膏盐层密切相关。该文圈定了许家咀地区下含山隆起部位两处有利找矿靶区,为下一步找矿工作指明了方向,证明了地质地球物理综合建模方法是指导找矿的有效方法。Based on the latest gravity and magnetic data,the surface geological and drilling information in the Xujiazui region,a detailed geology-geophysical model is established by using 2.5D gravity and magnetic joint inversion method in this paper.The model is used to clarify the relationship between the deep diorite,the sulfate evaporate salt layers and porphyry iron deposit,so as to guide the ore-prospecting in the Xiahanshan region,Xujiazui in the southwest margin of the Luzong basin.The result shows that the monzodiorite was emplaced at depth of 1200m,and the sulfate evaporate salt layers interbedded with magnetite in the contact zone between the intrusion and the Triassic Yueshan Formation,which is similar with the“Longqiao-type”mineralization.This study suggests that the porphyry iron mineralization in the Luzong basin is closely related to diorite and sulfate evaporate salt layers.Based on the research,two prospecting targets are delineated in the Xiahanshan uplift zone in the Xujiazui region,providing direction for the further ore-prospecting.Consequently,the geological-geophysical modeling technique has been proved to be an effective method of guiding mineral exploration.

关 键 词：长江中下游成矿带 庐枞盆地南西缘 下含山 深部地质结构 2.5D重磁联合反演 

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