据矿床地质和矿物组合及其分布特征,我们将该矿床成矿体系分为几个简单的体系分别进行了实验。实验前对大厂锡石-硫化物矿床的矿物组合进行了热力学计算,绘制了300℃、1大气压下的 fo_2—fs_2图(图1),用于指导实验。实验条件是:温度400—200℃(误差为±10℃);压力900—300大气压(按充填度计算);介质溶液0.5—2M 的碱金属氯化物(mKCl∶NaCl=1∶1)和0.5m 碱金属氟化物,pH=3—9。试料系用高纯化学试剂定量配制而成。实验中使用 According to the geological and mineral assemblages of the deposits and their distribution characteristics, we have separately conducted experiments on the ore-hosting system of the deposit in several simple systems. Before the experiment, the thermodynamic calculation of the mineral assemblages of cassiterite-sulphide deposits in Dachang was carried out. The fo_2-fs_2 diagram (Figure 1) was drawn at 300 ℃ and 1 atm, which is used to guide the experiment. The experimental conditions are: temperature 400-200 ℃ (error of ± 10 ℃); pressure of 900-300 atmospheres (calculated according to the degree of filling); 0.5-2M alkali metal chloride solution (mKCl: NaCl = 1: 1) and 0.5 m Alkali metal fluoride, pH = 3-9. The sample is prepared by quantitatively using high purity chemical reagent. Used in experiment