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舞阳铁矿区位于一个复式背斜的南翼,岩层走向呈北西西一南东东向,倾向南西,缓至中等倾斜.次一级的构造以断层为主.早期的走向断层主要为南盘上升的逆断层,后期的则是近乎南北向的断层,以西盘向北推移的平推断层为主.主要铁矿层产于太古界变质岩层中,沉积时代用铀铅法测定约为24亿年.其上覆有震旦系、寒武系和第三、第四系地层.铁矿层的围岩主要为:斜长角闪片麻岩、大理岩、白云质大理岩、辉石大理岩、花岗质条带状混合岩、斜长石榴角闪片麻岩、黑云母片麻岩、辉石角闪片麻岩等.从变质相上看,大体属角闪石岩相一辉石岩相.
The Wuyang iron ore area is located in the south wing of a compound anticline, with the strike of NWN-1North-eastward, south-westward and gentle to moderate slope.The secondary structure is dominated by faults.The early strike faults are mainly south plate Upward thrust fault, later is the nearly north-south fault, thrust westward to the north of the thrust thrust fault mainly produced in the Archean of the main iron ore metamorphic rock strata, sediment age determined by uranium-lead method is about 2.4 billion Year .On the cover of the Sinian, Cambrian and the third, Quaternary strata. Iron ore layer of the main rock: amphibolite gneiss, marble, dolomitic marble, pyroxene Dali Rock, granitic ribbon mixed rock, plagioclase gneissic gneisse, biotite gneiss, pyroxene gneiss, etc. From the metamorphic facies, Shiyan phase.