Study On Geology Characteristics And Metallogenic Prediction Of Luofu Antimony Deposit, Nandan,Guangxi Province

The Danchi metallogenic belt is one of the important nonferrous metal products area in China, which is located in the depression belt between the Jiangnan anticline and Yunnan-Guangxi syncline, the Northeast Wing of the middle-belt of the Luofu secondary folds anticline in the Danci metallogenic belt of antimony mining area, Luofu deposit was produced in the Devonian strata, which was strictly controlled by fracture structure. The mineral assemblages show that it is the typical characteristics of low temperature hydrothermal vein deposit.In this paper, the metallogenic factors of the Luofu antimony deposit were discussed based on comprehensive analysis of the metallogenic geological background, the geology of ore deposits and geochemical characteristics. Summary of geophysical anomaly were studied. The interpretation and evaluation of metallogenic prognosis were given in the end.Research on rock and ore shows that,the main ore-bearing strata of Luofu area are argillite, chalky clay, dunn bass and gritstone of Devonian system. The orebody was controlled by fracture zone and fault structure; ore minerals are mainly stibinite, secondary minerals were common pyrite, trace of marcacite,sphalerite; gangue minerals were mainly quartz and calcite; There were two metallogenic epoch and four separated metallogenic stages.Research on geochemistry shows that the wall-rock has a close relationship to metallogenic element in ore deposit, it also provid an important basis for material sources of antimony mining area. The distribution pattern of earth elements and wall rock antimony are similar each other, which shows that there is a possibility that the ore-forming material came from rock strata.Fluid inclusion results show that the variation range of formation temperature of fluid inclusions in quartz of the ore district was narrow. The homogenization temperature range between170℃and230℃which belong to low middle temperature hydrothermal deposit. the salinity varied between2.47%and7.39%, and was mainly in about5.1%,which belongs to low salinity; fluid density varied between0.790.94～0.99g/cm3,the mean value was0.87g/cm3, which belongs to low-middle density. In conclusion, the Luofu deposit belongs to low salinity, low-middle density and low middle temperature hydrothennal deposit.Based on the analysis and conclusion of geological conditions of Luofu ore district metallogenic prediction was given here. Followed by the description and evaluation of geophysical and geochemical anomalies, the Genlongpo prospect area is were circled based on Ⅱ geochemical anomaly, M2magnetic anomaly and mineralization anomaly been detected and other geological evidence.