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《GEOCHIMICA》 1995-S1
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FLUID GEOCHEMICAL MODELLING OF ORE-FORMING PROCESS OF LENGSHUIKENG Ag, Pb, Zn PORPHYRY DEPOSIT, JIANGXI, CHINA AND ITS GEOLOGICAL IMPLICATIONS

Chen Fanrong; Qiu Yizhuo (Guangzhou Institute of Geochemistry, The Chinese Academy of Sciences, Guangzhou 510640)(Institute of Geochemistry, CAS, Guiyang 550002)  
Lengshuikeng ore deposit is known as a large scale Ag, Pb and Zn porphyry deposit,in which subeconomic chalcopyrite mineralization has also been found in the centre and the deep part of the mineralized granitic porphyry. In the deep part, the chalcopyrite associates with pyrrhotite and cubanite and formed at temperatures up to 360℃ while the chalcopyrite+ pyrite+Fe-chlorite assemblage disseminates the centre and the upper part of the granitic porphyry and is, in the revealed range,gradually disappeared as the granitic porphyry becomes thinner and thinner with depth. The distribution of this mineral assemblage disproves the argument that its formation temperature is higher than that of Ag, Pb and Zn mineralization and suggests that it is developed in less permeable wall rocks.In order to find out the factors controlling the geochemistry of Lengshuikeng deposit, an fluid geochemical numeric modelling of the ore-forming proccess from 360℃ to 175℃ is made, based on the assumption that Lengshuikeng ore-forming fluid is analogous to H_2S-CO_2-bearing NaCl hydrathermal solution, in which pyrrhotite,chalcopyrite, galena, sphalerite, argenite and gold are presumably saturated at 360℃. According to the mineral assemblage and the physico-chemical conditions of the ore-forming system, the solubilities of Fe, Cu, Pb, Zn, Ag and Au in the ore-forming fluid are, respectively, controlled by the dissolution reactions of pyrite (or pyrrhotite, depending on the js_2 of the fluid system), chalcopyryte, ganenla, sphalerite, argentite and nature gold. There are 48 chemical species concerned in the calculation which are considered to be dominate in the fluid system. The modelling result is in general consistent with the mineral formation sequence and provides a most resonable explanation for the mineral zonation of Lengshuikeng deposit. Moreo ver, it indicates that Lengshuikeng ore-forming fluid is rich in copper at 360℃, but its geochemical evolution is not favourable for copper deposition and accumulation,which would be the major cause accounting for the subeconomic metallization of copper in Lengshuikeng deposit. Therefore, as the geochemistry of its source is concerned, economic copper deposits would be expected to develop in suitable geological and geochemical enviorenments in this region. However, the absence of economic gold deposition in Lengshuikeng ore deposit suggests that its source would be Poor in gold of being easy to be mobilized.
【Fund】: 国家自然科学基金
【CateGory Index】: P619.2
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