安徽庐枞盆地泥河玢岩型铁矿床地质-原生晕地球化学找矿模型  

Geological and primary geochemical halo prospecting model for Nihe porphyrite iron deposit in Luzong basin,Anhui Province

作　　者：张赞赞[1] 张舒[1,2] 吴明安[3] 写熹 吕博[1] 魏国辉[1] ZHANG ZanZan;ZHANG Shu;WU MingAn;XIE Xi;Lü Bo;WEI GuoHui(Geological Survey of Anhui Province(Anhui Institute of Geological Sciences),Hefei 230001,Anhui,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;Bureau of Geology and Mineral Exploration of Anhui Province,Hefei 230001,Anhui,China)

机构地区：[1]安徽省地质调查院(安徽省地质科学研究所),安徽合肥230001 [2]合肥工业大学资源与环境工程学院,安徽合肥230009 [3]安徽省地质矿产勘查局,安徽合肥230001

出　　处：《矿床地质》2020年第2期305-325,共21页Mineral Deposits

基　　金：中国地质调查局地质调查工作项目(工作项目编码1212011120862、12120114038001);安徽省公益性地质工作项目(编号:2016-g-1-7)的联合资助。

摘　　要：开展长江中下游地区玢岩型铁矿床轴向原生晕地球化学分析及建模,可弥补地球物理勘探结果的多解性及探测精度的局限性,对定位和评价深部盲矿体具有至关重要的作用。文章在以往研究的基础上,开展庐枞盆地泥河玢岩型铁矿床钻孔原生晕的研究工作,采用多元统计分析方法,查明了主要成矿指示元素在不同地质体中的富集和亏损,确定了磁铁矿、硫铁矿和硬石膏矿体的矿中、近矿及远矿指示元素组合,结合矿床成因模型,建立了泥河玢岩型铁矿床地质-原生晕地球化学找矿模型,通过罗河和小包庄玢岩型铁矿床的佐证,认为该模型可以应用于长江中下游成矿带玢岩型铁矿床的勘探工作中。For the purpose of locating and evaluating deep blind orebodies,it is very important to carry out axial primary geochemical halo analysis and modeling of porphyrite iron deposits in the middle and lower reaches of the Yangtze River,and the result can also make up for the multiplicity of geophysical exploration results and the limitation of detection accuracy.Based on geological and geochemical characteristics of the deposit derived from previously investigations,the authors carried out the study of primary halos in boreholes of the Nihe porphyrite iron deposit in Luzong volcanic basin.Through multivariate statistical analysis of 18 selected trace elements,the authors found the enrichment and depletion of ore-forming indicator elements in different geological bodies and determined the ore-forming elements,near-ore elements and far-ore elements of magnetite,pyrite and anhydrite orebodies respectively.A geological and primary geochemical halo prospecting model for the Nihe porphyrite iron deposit was established in combination with the genetic model,which could be applied to the exploration of porphyrite iron deposits in the middle and lower reaches of the Yangtze River metallogenic belt supported by the primary geochemical halos of Luohe and Xiaobaozhuang porphyrite iron deposits.

关 键 词：地球化学 原生晕地球化学 找矿模型 玢岩型铁矿 泥河铁矿床 庐枞盆地 长江中下游成矿带 

分 类 号：P618.31[天文地球—矿床学]