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碑楼铜矿床矿化石英脉中流体包裹体均一温度介于158-385℃之间,均值为270℃;盐度介于2.74%-62.51%(NaCl)之间,均值为15.2%(NaCl);均一温度峰值分别为210-240℃和270-300℃,盐度峰值分别为5%-10%(NaCl)和55%-60%(NaCl)。成矿流体在250-380℃区间发生沸腾作用,分离出了富液相和富气相的中一高温低盐度的两相流体和含子晶的中一高温高盐度的三相流体;在250℃左右时,高盐度的三相流体基本消失,成矿流体逐渐均一成以富液相为主的中一低温低盐度流体。流体的气体组分主要是H2O,个别包裹体的气相中含有少量的CO2。矿化石英脉中的δ18OH2O介于1.26‰-7.24‰之间,均值为4.63‰;δD介于-89‰--69‰之间,均值为-76.67‰,表明碑楼铜矿床的成矿流体主要来源于岩浆,后期混入了大气降水。矿石矿物中黄铁矿的δ34S介于-2.8‰～-1.3‰之间,均值为-1.75‰;黄铜矿的δ34S介于1.02‰～2.12‰之间,均值为1.46‰。矿石矿物的206Pb/204Pb介于18.295-18.402之间,均值为18.349;207Pb/204Pb介于15.555-15.573之间,均值为15.564;208Pb/204Pb介于38.215-38.331之间,均值为38.273;说明矿石中的硫、铅可能主要来自于深源,后期受到上地壳物质和大气降水的混染。以上研究证明,碑楼铜矿床属于中一高温浅成斑岩型铜矿床。
The average fluid inclusions in the mineralized quartz veins of the Beilu copper deposit are between 158-385 ℃ with an average of 270 ℃. The salinity ranges from 2.74% to 62.51% (NaCl) with a mean of 15.2% (NaCl ). The peak values of homogenization temperature were 210-240 ℃ and 270-300 ℃ respectively. The salinity peaks were 5% -10% (NaCl) and 55% -60% (NaCl) respectively. The ore-forming fluid boils in the temperature range of 250-380 ℃ and separates the middle-high temperature and low-salinity two-phase fluid and the sub-high temperature and high salinity three-phase fluid in the liquid-rich and gas-rich phases. At about 250 ℃, the high-salinity three-phase fluid basically disappeared and the ore-forming fluid gradually became a medium-low temperature and low salinity fluid dominated by the rich liquid phase. The gas component of the fluid is mainly H2O and the individual inclusions contain a small amount of CO2 in the gas phase. The δ18OH2O in the mineralized quartz veins ranged from 1.26 ‰ -7.24 ‰, with an average of 4.63 ‰. The δD ranged from -89 ‰ to 69 ‰, with an average of -76.67 ‰, indicating that the mineralization of the Beilu copper deposit The fluid mainly comes from magma, mixed with atmospheric precipitation later. The δ34S of pyrite in ore minerals ranged from -2.8 ‰ to -1.3 ‰, with an average of -1.75 ‰. The δ34S of chalcopyrite ranged from 1.02 ‰ to 2.12 ‰, with an average of 1.46 ‰. The 206Pb / 204Pb of ore minerals ranged from 18.295 to 18.402, with an average of 18.349; 207Pb / 204Pb ranged from 15.555 to 15.573 with an average of 15.564; 208Pb / 204Pb ranged from 38.215 to 38.331 with an average of 38.273; In the sulfur, lead may be mainly from the deep source, later by the upper crustal material and atmospheric precipitation mixed dye. The above studies show that the Beilou copper deposit belongs to the high-temperature epithermal porphyry copper deposit.