弓长岭富铁矿氧化还原环境的形成机制  

The Formation Mechanism of the Redox Environment in the Rich Iron Deposits of Gongchangling

作　　者：夏建明[1] 王恩德[1] 赵纯福[1] 门业凯[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2011年第11期1643-1646,共4页Journal of Northeastern University(Natural Science)

基　　金：教育部高等学校博士学科点专项科研资金资助项目(N100401006;N090601002)

摘　　要：通过分析弓长岭二矿区铁矿中变质矿物与铁矿物的组合规律,特别是石墨、堇青石和铁铝榴石这三个矿物,分析得出该矿区中的石墨是原始泥质沉积物经区域变质作用形成的.通过物理化学计算得出铁氧化物在纯水条件下的赋存形式是赤铁矿,在石墨存在的条件下,铁氧化物的赋存形式是磁铁矿.由该地区部分赤铁矿与磁铁矿紧邻的关系得出由纯水离解产生的O2具有很低的活跃性,并由此观点解释了该矿区以及鞍本地区出现的"两头大,中间小"的有趣现象以及该矿区地下500 m假象赤铁矿产生的原因.The environment of mineral preservation was indificated by the mineral component of the metamorphic.The graphite came from muddy sediments which formed by metamorphism according to the mineral assembled,especially the graphite,cordierite and garnet in the second iron ore of Gongchangling.By the calculation of physical chemistry,the iron oxide can form hematite under the conditions of pure water while it can form magnetite under the conditions of graphite.The activity of the O2 which comes from H2O is very low by the relation of hematite and magnetite.The results can be used to explain the appearance of ＂two sides are large,the intergrade is small＂ and the appearance of the martite which is undergroud 500 m.

关 键 词：矿物组合 物理化学 氧化还原环境 纯水 石墨 

分 类 号：P62[天文地球—地质矿产勘探]