宁芜盆地白象山铁矿床地质特征及成因分析  

Geological characteristics and genesis of Baxiangshan iron deposit in Ningwu basin

作　　者：邸思维[1] 范裕[1] 张乐骏[1] 马良[1] 钱兵[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2011年第1期123-127,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(40803015;40830426);安徽省公益性地质工作资助项目(2007-1;2005-51);安徽省优秀青年科技基金资助项目(08040106907;04045063)

摘　　要：白象山式铁矿床位于宁芜中生代断陷盆地南段,属于宁芜地区玢岩型铁矿中凤凰山式铁矿床。该矿床的主矿体呈似层状,产于闪长岩体和黄马青组砂页岩接触带部位。赋矿围岩发生强烈的角岩化、钠长石化、金云母化、黑云母化、碳酸盐化,矿石矿物主要为磁铁矿、假象赤铁矿、菱铁矿,脉石矿物主要有钠长石、石榴子石、阳起石、磷灰石、金云母、石英、碳酸盐等。矿床形成划分为热液期和表生期。热液期又可分为气成高温阶段和中低温热液阶段。通过对该矿床地质特征和控矿因素的研究,认为白象山铁矿床属于玢岩型铁矿中的矽卡岩型矿床。Baixiangshan iron deposit is located in the southern part of Ningwu Mesozoic faulted basin. It is classified as Fenghuangshan-type iron deposit in the model of Ningwu porphyritic type iron deposit. Main body of the Baixiangshan deposit is stratabound and hosted in the contact zone between the diorite intrusion and the Huangmaqing group sandstone interbeded with shale. The wall-rock develops strong hornfels contact metaorphism as well as phlogopite, albite, biotite, carbonate alterations. The ore minerals are magnetite, hematite, siderite, and the gangue minerals are albite, garnet, actinolite, apatite, phlogopite, quartz, carbonate, etc. Mineralization is divided into two periods： the hydrothermal period and the supergene period. The hydrothermal period can be further divided into two stages： the high-temperature stage and the low-temperature hydrothermal mineralization stage. Based on the researches on geological characteristics and ore-controlling factors of the iron deposit, the Baixiangshan iron deposit is described as a skarn deposit, a member of the porphyritic type iron deposit family.

关 键 词：铁矿床 闪长岩体 白象山 矽卡岩型矿床 

分 类 号：P611.13[天文地球—矿床学]