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南芬铁矿为一大型鞍山式沉积变质铁矿床,由太古界鞍山群含铁岩段中的三层铁组成.地质构造较简单,属单斜构造,底板为角闪片岩,顶板为云母石英片岩,三层铁间夹有石英绿泥片岩或绿泥角闪片岩.铁矿层南起黄柏峪的26线,北止于茶信沟,出露地表长为3400米.矿体近南北走向,倾向西,平均倾角45度,面积约为10平方公里,由黑贝沟、铁山和黄柏峪三个矿区组成.
Nanfen Iron Ore is a large-scale Anshan-style sedimentary metamorphic iron deposit composed of three layers of iron in the iron-bearing rock segment of the Anshan Group in the Archean, with a simple geological structure and a monoclinic structure with a hornblende of which the bottom is mica Quartz schist, sandwiched between the three layers of quartz green mud schist or greenpeak hornblende iron ore layer from the south of Cork Valley 26 lines, north of the tea letter groove, exposing the surface length of 3400 meters. To the west, with an average inclination of 45 degrees, an area of about 10 square kilometers, by the Black Bay ditch, Tieshan and Huangbaoyu three mining areas.