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一、概述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、马山等地。诛罗—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—其林山断裂带作北北东向分布。铁矿化是火山活动一定阶段的产物,而黄铁矿是铁矿化的延续与发展,二者构成完整的玢岩铁矿类型。一般地说,铁矿产于次火山岩穹窿构造顶部(如南山)或隐爆角砾岩筒的中心位置(如凹
First, an overview of the concave Hill ore field is located in the middle of Ning Wu volcanic basin, the main iron-sulfur ore area have concave Hill, Xiangshan, Nanshan, Tao Village, Dongshan, Mashan and other places. The Zhuo-Cretaceous Dayanshan Formation Anshan volcanic rock series cover the whole area, later than the volcanic series of ultra-shallow Chenggui long diorite porphyritic metallogenic rock. The deposit is distributed along the Jianshan-Linling fault zone north-north-eastward. Iron mineralization is a product of a certain stage of volcanic activity, and pyrite is the continuation and development of iron mineralization, both of which form a complete rock iron ore type. In general, iron ore is located at the top of the secondary volcanic domes (eg, Nanshan) or at the center of crypto-explosive breccia