河南三佛宫铁矿床地球化学特征及其地质意义  

Geochemical Characteristics of the Sanfogong Iron Deposit in Jiyuan,Henan Province and Its Geological Significance

作　　者：祝朝辉[1] 刘淑霞[1] 宋锋[1] 张宏伟[1] 谷德敏[1] 

机构地区：[1]河南省国土资源科学研究院,郑州450053

出　　处：《矿物岩石地球化学通报》2017年第6期955-963,共9页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：河南省国土资源厅地质矿产科技攻关项目(2014-08)

摘　　要：为探讨河南三佛宫铁矿床的成矿物质来源及形成环境,选取典型铁矿石和赋矿围岩进行主量元素、微量元素和稀土元素分析测试。分析结果显示,铁矿石主要由TFe_2O_3和SiO_2组成,Al_2O_3和TiO_2含量及微量元素、稀土含量均较低,页岩标准化的稀土元素配分模式呈轻稀土亏损、重稀土富集型,具有明显的La、Eu、Y正异常和弱的Ce负异常,以及较高的Y/Ho值。研究表明,三佛宫铁矿是由极少碎屑物质加入的化学沉积岩,其成矿物质主要来源于海底热液,是在海底相对缺氧的环境中形成的,是与海相火山沉积有关的前寒武纪火山沉积变质型铁矿。The Sanfogong iron deposit, in the Jiyuan city, Henan Province, is located at the southern part of North China Block. In order to constrain the origin of ore-forming material and metallogenic environment, whole rock major and trace elements of typical iron ores and host rocks have been analyzed in this paper. The iron ores have high TFeO and SiO2 and low A1203 and TiO2 ; and low trace element concentrations. The iron ores are characterized by depletion of LREE, enrich- ment of HREE, showing apparent La-Eu-Y positive anomaly and Ce negative anomaly and high Y/Ho ratios. Such geo- chemical features indicate that iron ores of Sanfogong were precipitated from a relatively reduced fluids involved with a few clastic components. The ore-forming material is dominated by the marine hydrothermal fluids, indicating that the deposit is a meta-volcanic sedimentary type iron deposits related to Precambrian marine volcanism.

关 键 词：三佛宫铁矿 地球化学 前寒武纪 沉积变质型 条带状铁建造 

分 类 号：P618.31[天文地球—矿床学]