| The Cu, Pb, Zn polymetallic ore field in Yinshan is an old mine with centuries history of mining exploitation. The lead-zinc ore belt of Jiulong is located in the north of ninth district of the ore field, the copper and sulfur mineralization belt in Yinshan and the south of Beishan's lead-zinc ore belt. In the position of earth formation, it lies in the depression of the south of Tailong and Qiantang's link, the northeastern margin of the Mesozonic volcanic basin and the northwestern of the deep fault zone in northeastern of Jiangxi province.On the basis of production and scientific research, this paper mainly describes the geological background of mineralization.Summarizing the metallogenic law of the regional and ore deposit of Jiulong district.Finding the Logo of mining and generalizing the ore-controlling factors.Thereby establishing a more realistic model of metallogenic deposit and the prediction model which owns relationships between the potention ore deposits and geological conditions. This can be used for the prediction of the unknown location in the lead-zinc ore belt of Jiulong district in Yinshan.The main contents of the paper can be summarized as the following five points:1. Analysising from the regional geology, geophysics and geochemistry comprehensively, emphasis was put on the developing environment of metallogenic function in the lead-zinc ore belt of Jiulong district.2. Yinshan upfolds the fault zone and the secondary construction create a favorable space for leading ore. It is the the main factor of rock control and ore control. Near EW, the fault zone controls the ore of every mineralized zone.3. The characteristics of Pb, Zn, S, C, O isotopes. REE and regional geochemistry background show the metallogenic substances have many resources and metallogenic function owns many periods. Metallogenic elements like Pb, Zn, Ag mainly come form subvolcanic of inner district. A small number of metallogenic elements which come from the basement also take part in the metallogenic function. Ore-forming fluid is a mixture hydrothermal of magmatic water and part of the natural water.4. The character of ore inclusion reveals that metallogenic fluid is the type of NaCl-KCl-CaSO4-H2O liquid with a high salinity which has a middle-low temperature, restore or weak reducing conditions, neutral-weak acid.5. Through researching on the geological background, the characteristics of mineralization, the characteristics of geochemistry, the ore controlling factors, the way of metallogenic function, mechanism of metallogenic, the law of mineral accusation and so on, the author regards that it has great prospecting potential of mining the deep ore in the west, east, southeast, southwest, north of Jiulong's lead-zinc ore belt. . |
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