宁夏照壁山铁矿成矿地质特征与找矿方向  

Geological characteristics and prospecting direction of the Zhaobishan iron deposit,Ningxia

作　　者：李净 海连富 母彩霞 马文文 杨站伟 LI Jing;HAI Lianfu;MU Caixia;MA Wenwen;YANG Zhangwei(The 7th Institute of Geology ＆ Mineral Exploration of Qinghai Province,Xi＇ ning 810099,China;Ningxia Mineral and Geological Survey Institute,Yinchuan 750021,China;Ningxia Geology and Mineral Exploration Institute,Yinchuan 750021,China;The 3rd Institute of Geology ＆ Mineral Exploration of Qinghai Province,Xi＇ning 810099,China)

机构地区：[1]青海省第五地质矿产勘查院,西宁810099 [2]宁夏矿产地质调查院,银川750021 [3]宁夏地质矿产勘查院,银川750021 [4]青海省第三地质矿产勘查院,西宁810000

出　　处：《地质找矿论丛》2018年第2期243-247,共5页Contributions to Geology and Mineral Resources Research

基　　金：宁夏回族自治区重点研发计划重大(重点)项目(编号:2018YBZD0045);宁夏地质矿产资源勘查开发创新团队项目(编号:2018002)联合资助

摘　　要：文章从区域地质背景和矿区地质特征入手,结合前人研究成果,深入分析了照壁山铁矿床地质特征和成矿规律,探讨了矿床成因类型,建立了找矿标志。研究发现:照壁山铁矿主要产于石炭系土坡组和臭牛沟组的砂岩、粉砂岩中,矿体主要沿着近EW向的断裂和裂隙分布,构造控矿明显;矿体多呈脉状、透镜状、似层状,具有原生矿石和氧化矿石2中类型,围岩蚀变表现为硅化、褐铁矿化、碳酸盐化、黄铁矿化等,围岩蚀变较强;铁矿的形成主要与中酸性岩浆的侵入关系密切,矿床类型为中低温热液矿床;近EW向的构造破碎带、弧形构造的扩容带、层间裂隙以及"硅钙面"附近是寻找铁矿的有利部位,在其深部还具有较大找矿潜力。Based on the regional geological background and geological characteristics of the deposit area and previous research results the metallogenic regularities and genetic type of Zhaobishan iron deposit are analyzed and the prospecting marks established.The iron deposit is located in sandstone and siltstone of Tupo and Chouniugou formaions in Carboniferous system.Ore bodies are vein-like,lenticular and layeroid occurring along or near to EW faults and fractures,obviously controlled by structure.There are two types of ore,i.e.the primary ore and oxidized ore.The wall rock is strongly altered with silicification,ferritization,carbonatization and pyritization.The ore is closely related to the intrusion of acidic magma in Yanshan period,and the genetic type of deposit is medium-low temperature hydrothermal deposit.Nearly EW trending cataclastic zone,dilation zone of ring structure,inter-formation fracture and periphery of the silicious material and calcareous material interface are the favorite place to form iron ore and it is potential to prospect big ore bodies to depth.

关 键 词：照壁山铁矿床 成矿地质背景 矿床地质特征 成矿规律 矿床成因类型 找矿方向 宁夏 

分 类 号：P618.31[天文地球—矿床学] P613[天文地球—地质学]