在宁芜玢岩铁矿深部寻找大冶式铁矿的探讨——以宁芜铁矿南段为例

Prospecting for Daye-type iron deposit in depth of porphyrite-type iron deposit:A case study of southern Ningwu iron deposits in Anhui Province

通过对长江中下游Fe-Cu-Au多金属成矿带内重要的宁芜、大冶铁矿成矿模式和成矿地质背景的分析,按照成矿系列中缺位预测的原则,认为在宁芜盆地南段的深部,岩体具有双层结构特征,进而结合其深部存在着与矿体相关的膏盐层,提出了宁芜玢岩铁矿之下应存在大冶式铁矿的新认识。在此基础上,建立了宁芜盆地南段"丰"字型成矿模式,并采用多重物探方法重点对姑山铁矿南部进行了综合探测。探测结果表明,该区应具有较好的找矿潜力。

Based on an analysis of the metallogenic models and geological settings of both the Ningwu-type and the Daye-type iron deposits which constitute the most important deposit types in the Middle-Lower Yangtze Fe-Cu-Au polymetallic metallogenic belt,and on the vacant predication theory of metallogenic series,the authors suggest that the magmatic bodies have a double-layer structure in the southern Ningwu basin and that there is a gypsolyte bed intimately related to iron ores in the depth of southern Ningwu basin.Furthermore,the authors have advanced the new viewpoint that the Daye-type iron deposit can be found beneath the porphyrite-type iron deposit.On such a basis,a ＂丰＂-type metallogenic model is put forward.Synthetic survey was performed in the southern Gushan iron deposit of southern Ningwu Basin by means of multiple geophysical methods and,on such a basis,the authors hold that the southern Gushan iron deposit has a good prospecting potential.