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凹山矿田位于宁芜火山岩盆地中段,主要铁硫矿区有凹山、向山、南山、桃村、东山、马山等.侏罗-白垩纪大王山组安山质火山岩系覆盖全区:晚于火山岩系的超浅成相辉长闪长玢岩为成矿母岩.矿床沿尖山-麒麟山断裂作北北东向分布.铁矿化是火山活动一定阶段的产物;黄铁矿化则是铁矿化的延续与发展,二者构成完整的玢岩铁矿类型.铁矿通常产于次火山岩穹窿构造顶部(南山)或隐爆角砾岩筒中心(凹山),硫铁矿则产于铁矿床的外圈(向山)或角砾岩筒周围的安山质爆裂-震碎角砾岩中(马山),构成铁矿床的上带或外带.铁硫矿化蚀变带的垂直分带明显,自下而上可分为:①岩体下部浅色蚀变带(碱质蚀变带),为早期蚀变未经中、晚期叠加改造的部分,由钠长石化带构成;②岩体
The Qianshan ore field is located in the middle part of the Ningwu volcanic basin, and the main iron-sulfur ore areas include the Aoshan, Xiangshan, Nanshan, Taocun, Dongshan and Mashan etc. The Anshan volcanic rock series of the Dawangshan Formation in the Jurassic to Cretaceous cover the whole area: Ultra-shallow into the gabbro feldspathic diorite porphyry in the volcanic rocks is the metallogenic host rock, which is distributed along the Jianshan-Qiroling fault north-northeastward, and iron mineralization is the product of a certain stage of volcanic activity. Is the continuation and development of iron mineralization, and both of them form a complete igneous iron ore type.The iron ore is usually produced at the top of the subvolcanic dome (Nanshan) or the center of the cryptoexplosive breccia Occurred in the outer ring of iron deposits (Xiangshan) or breccia tube around the anamorphic burst - crushed breccia (Mashan), constitute the iron ore belt or belt. The vertical zonation of the band is obvious, which can be divided from bottom to top: ① Light alteration zone (Alkaline alteration zone) in the lower part of the rock mass is the part of early alteration altered and superimposed by the middle and late stages, Petrochemical belt structure; ② rock