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

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.