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一、地质概况 长江中下游发育一些中生代陆相火山岩断陷盆地。其中庐枞、宁芜和繁昌等盆地内均发现有铁矿。在铁矿体及蚀变围岩内多种微量元素,均具有明显的垂直分带现象。这种分带规律既说明了成矿条件的特点,又显示了找矿标志的意义。 庐枞盆地的罗河铁矿作为一个大型隐伏铁矿床,它的蚀变和金属原生分带,在玢岩铁矿床中更有典型意义。该盆地内的钾玄岩—粗安岩—粗面岩组合,可划分三个旋回,由早至晚,称为砖桥组、双庙组和浮山组。其中第一旋回是含矿旋回。罗河铁矿与成矿有关的是粗安岩和粗安质凝灰岩。金属和蚀变的原生分带是
First, the geological overview The middle and lower reaches of the Yangtze River development of some Mesozoic continental volcanic faulted basin. Among them, Luzong, Ningwu and Fanchang found iron deposits in the basins. In the iron ore body and altered rock a variety of trace elements, have obvious vertical zonation. This pattern of zoning not only illustrates the characteristics of metallogenic conditions, but also shows the significance of the ore-prospecting symbol. Luohe Iron Mine in Luzong Basin, as a large-scale concealed iron deposit, is characterized by alteration and metal primary zoning in the Yan iron deposit. The basin of potash - rock - rock assemblage, can be divided into three cycles, from morning till evening, known as the brick bridge group, Shuangmiao group and Fushan formation. The first cycle is the ore-bearing cycle. Luohe iron ore and ore-forming are rough rock and coarse anamorphic tuff. The primary band of metal and alteration is