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罗维钨多金属矿床是近年来广西第四地质队在桂西南西大明山地区新发现的一个具大型规模的夕卡岩型矿床,钨多金属矿化主要产在深部隐伏岩体外接触带的夕卡岩中,矿体呈似层状平行产出。文章对成矿流体包裹体的初步研究表明,区内成矿流体包裹体主要有NaCl-H_2O型和NaCl-CO_2-H_2O型两种类型,成矿流体主要为中—高温(200~360℃)、中低盐度(2.00%~9.00%NaCl_(eq))和中低密度(0.621~0.987g·cm~(-3))流体,成矿过程中可能存在深部偏高盐度流体与浅部偏低盐度流体的混合,矿床形成的平均压力为108.9×105Pa,计算得出的平均成矿深度约7.86 km。结合区域成矿分带特征进一步提出,罗维钨多金属矿床与深部隐伏岩体有关,属岩浆流体与地层中的钙质岩石发生双交代的产物。
The Liaowei tungsten polymetallic deposit is a large-scale skarn deposit newly discovered by the fourth geological team of Guangxi in recent years in the Daming Mountain area of western Guangxi. The tungsten polymetallic mineralization is mainly produced in the outer contact zone of the deep concealed rock mass Of the skarn, the ore body is similar to the layer-like output. Preliminary studies on the ore-forming fluid inclusions indicate that the ore-forming fluid inclusions in the area are mainly of NaCl-H_2O type and NaCl-CO_2-H_2O type. The ore-forming fluids are mainly medium-high temperature (200-360 ℃) , Moderate to low salinity (2.00% -9.00% NaCl eq) and medium to low density (0.621-0.987 g cm -3) fluids. There may be deep high salinity fluid and shallow Low salinity fluid mixing, the average pressure of the formation of 108.9 × 105Pa, calculated average depth of about 7.86 km. Combined with the characteristics of regional metallogenic belt, it is further proposed that the Liaowei tungsten polymetallic deposit is related to the deep concealed rock mass, which is the product of double crossover of calcareous rock in the magmatic fluid and the strata.