山东省东平-汶上地区铁矿矿床成因探讨
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摘要
山东省东平-汶上铁矿成矿带是鲁西重要的成矿带,区内已发现李官集、彭集等多个大中型铁矿床,探明了铁矿石资源量超过12亿t。通过收集东平-汶上地区基础地质调查、区域重磁、矿产勘查、科研成果等资料,分析了区内地层、构造、岩浆岩及区域航磁异常特征、重力异常特征与铁矿床的对应耦合关系,提出了矿床的3个控矿因素:即控矿地层(泰山岩群雁翎关组、山草峪组,地层控矿专属性)、控矿构造(同斜复式背斜构造)、控矿岩浆岩(改造和破坏了铁矿带的完整性),通过对成矿区带样品采集测试,分别从主量元素、稀土元素、微量元素、原岩恢复、变质岩构造背景等方面进行系统分析对比,探讨了该区铁矿床为海相岛弧火山——沉积变质成因。
Wenshang-Dongping iron deposit is an important iron ore belt in Luxi area. Liguanji iron deposit,Pengji iron deposit and other large and medium-sized iron deposits have been found in this area. The already proved reserve of iron ore resource is more than 12 billion tons. Through comprehensive collection of basic geological survey,regional geophysical prospecting,mineral exploration,scientific research and other information in recent years,regional strata,structures,magmatic rocks,regional aeromagnetic anomaly,gravity anomaly characteristics and the relationship between iron ore deposit have been analyzed. Three major ore controlling factors have been put forward,they are ore controlling strata( Yanlingguan formation,Shancaoyu formation in Taishan rock group,ore controlling strata),ore controlling strucutures( homoclinal compound anticline) and ore controlling magmatite( reformed and destroyed the integrity of iron ore belt). Through collecting and testing samples in this area,main elements,rare earth elements,the recovery of the original rocks and tectonic settings of metamorphic rocks have been analyzed systemically and compared,and the origin of iron deposits in this area has been discussed in detail.
Wenshang-Dongping iron deposit is an important iron ore belt in Luxi area. Liguanji iron deposit,Pengji iron deposit and other large and medium-sized iron deposits have been found in this area. The already proved reserve of iron ore resource is more than 12 billion tons. Through comprehensive collection of basic geological survey,regional geophysical prospecting,mineral exploration,scientific research and other information in recent years,regional strata,structures,magmatic rocks,regional aeromagnetic anomaly,gravity anomaly characteristics and the relationship between iron ore deposit have been analyzed. Three major ore controlling factors have been put forward,they are ore controlling strata( Yanlingguan formation,Shancaoyu formation in Taishan rock group,ore controlling strata),ore controlling strucutures( homoclinal compound anticline) and ore controlling magmatite( reformed and destroyed the integrity of iron ore belt). Through collecting and testing samples in this area,main elements,rare earth elements,the recovery of the original rocks and tectonic settings of metamorphic rocks have been analyzed systemically and compared,and the origin of iron deposits in this area has been discussed in detail.
引文
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[2]孔庆友,张天祯,于学峰,等.山东矿床[M].济南:山东科学技术出版社,2006.
[3]王继芳,徐然,杜显彪,等.山东省东平县大高庄铁矿床地质特征及矿床成因[J].山东国土资源,2016,32(5):32-37.
[4]张增奇,刘明渭.山东省岩石地层[M].武汉:中国地质大学出版社,1996.
[5]张增奇,张成基,王世进,等.山东省地层侵入岩构造单元划分对比意见[J].山东国土资源,2014,30(3):1-23.
[6]田明阳,陈玉菡,张相峰,等.济宁市汶上泰山岩群张楼铁矿床特征及成因探讨[J].山东国土资源,2015,31(1):8-11.
[7]黄太岭,高建国.山东省区域地球物理场[J].山东地质,2002,18(3-4):88-94.
[8]胡伟.鲁西地区航磁特征及其反映的地质意义[J].中国煤炭地质,2016,28(7):52-68.
[9]施兴,彭朝晖,王德启,等.重力勘查在寻找铁矿上的应用[J].物探与化探,2012,36(2):159-162.
[10]徐友松,罗海伟,赵金,等.山东省东平县大牛地区铁矿成因类型及找矿方向研究[J].山东国土资源,2015,31(10):17-21.
[11]钟国绘,黄智辉.铁山岩体东部矿床成矿建造及矿床成因和找矿方向[J].资源环境与工程,2012,26(6):551-556.
[12]周世泰.鞍山-本溪地区条带状铁矿地质[M].北京:地质出版社,1994.
[13]白瑾.五台山早前寒武纪地质[M].天津:天津科学技术出版社,1986.
[14]郝兴中,李洪奎,李英平,等.山东单县地区BIF型铁矿成矿时代——SHRIMP U-Pb锆石定年[J].山东国土资源,2017,33(3):1-7.
[15]李永峰,谢克家,罗正传,等.河南舞阳铁山铁矿床地球化学特征及其环境意义[J].地质学报.2013,87(9):1377-1398.
[16]沈其韩,宋会侠,赵子然.山东韩旺新太古代条带状铁矿的稀土和微量元素特征[J].地球学报,2009,30(6):693-699.
[17]张岩,顾雪祥.山西原平王家庄条带状磁铁石英岩矿床元素地球化学特征及其地质意义.现代地质[J].2010,24(1):69-79.
[18]Foley S F,Wheller.G E.Parallels in the origin of the geochemical signatures of island arc volcanics and continental potassic igneous rocks:The role of residual titanates[J].Chemical Geology,1990.1-18.
[19]张本仁.大陆造山带地球化学研究:Ⅰ岩石构造环境地球化学判别的改进[J].西北地质.2001,34(3):47-63.
[20]李延河,侯可军,万德芳,等.前寒武纪条带状硅铁建造的形成机制与地球早期的大气和海洋[J].地质学报,2010,84(9):1359-1373.