辽宁弓长岭铁矿二矿区围岩原岩恢复

The protolith restoration of the second diggings wall rock in Gongchangling iron ore,Liaoning province

本文通过对辽宁弓长岭二矿区特征围岩的造岩元素、微量元素和稀土元素做了原岩恢复图解。根据图解中投点情况以及元素数据分布情况,结合围岩地质特征,推断辽宁弓长岭铁矿变质岩原岩建造,探讨其与铁矿床的成因关系。研究表明,斜长角闪岩原岩为一套基性火山岩,具有大陆拉斑玄武岩的特点;混合岩的原岩主体为砂岩,其稀土元素特征表现其为典型的壳源型碱性花岗岩;蚀变岩原岩主体为沉积岩等副变质岩。这一结论,对揭示铁矿床成因和指导找矿勘探工作具有重要意义。

The protolith restoring diagrams have been made according to the rock-forming elements,trace elements and rare earth elements of characteristic wall rocks from the second diggings of Liaoning Gongchangling iron ore.Based on the graphic elements as well as points for the distribution of data,combined with the geological characteristics of the wall rocks,the authors infer the construction of protolith of Liaoning Gongchangling iron ore metamorphic rocks and explore the genetic relationship with the iron ore deposit. Research shows that the protoliths of plagioclase amphibolite rocks were a set of basic volcanic rocks with the characteristics of mainland tholeiite; the original rock mainbody of migmatite were sandstone, its REE Characteristics showed it was typical crust source alkaline granite; the original rock mainbody of altered rocks were para--metamorphic rocks such as sedimentary rock. This deduction is of great significance to reveal the mineralization of iron ore deposits and to guide the work of prospecting.