摘要
根据矿物共生组合及测试数据的热力学计算结果推断:长营岭钨锡石英脉矿床形成温度为300～200℃;总压力为89MPa;f_(O_2)为10^(-33)～10^(-41)Pa;f_(S_2)为10^(-11)～10^(-15)Pa;f_(CO_2)为10^(2.9)～10Pa。成矿热液的pH值为4.8～6.1;a_(S^(2-))为10^(-8.31)～10^(-8.30);a_((SO_4)^(2-))为10^(-20.46)～10^(-17.20);a_((CO_3)^(2-))为10^(-11.27)～10^(-9.24)。热液中铁钨锰矿沉淀条件:a_(Fe^+)为10^(-6.74)～10^(-7.51);a_(Mn^(2+))为10^(-2.81)～10^(-8.07);a_((WO_4)^(2-))为10^(-14.8)～10^(-10.82)。白钨矿沉淀条件。a_(Ca^(2+))为10^(-2.08)～10^(-1.80);a_((WO_4)^(2-))为10^(-13.29)～10^(-10.88)。
According to the study on the mineral assemblages and the date of hydro-thermal calculations, it is suggested by the author that the formation tem-perature of the deposit is about frorn 300 to 200℃ and the total pressureis 89 M Pa. Oxygen, sulfur and carbon dioxide fugacities are also con-sidered as ranges from 10^(-33) to 10^(-41), from 10^(-11) to 10^(-15) and from 10^(2.9)to 10 Pa respectively. pH value of ore-bearing fluids varies from 4.8 to 6.1,a_(S^(2-)) ranges from 10^(-8.31) to 10^(-8.30), a_(SO_4^(2-)) from 10^(-20.46) to 10^(-17.2) and a_(CO_8^(2-))from 10^(-11.27) to 10^(19.24). During the deposition of wolframite the activi-ties of Fe^(2+), Mn^(2+) and WO_4^(2-) are calculated as ranges from 10^(-6.74) to10^(-7.51),10^(-2.81)～10^(-3.87)and10^(-14.8)～10^(-10.82), respectively.On the other hand,the activities of Ca^(2+) and WO_4^(2-) are considered as ranges from 10^(-2.08) to10^(-1.8) and 10^(-13.29) to 10^(-10.38), while scheelite is depositing.
关键词
钨矿
锡矿
成矿条件
热力学系统
tungsten deposit
tin deposit
ore-forming condition
thermodynamic system
Changyingling
Guangxi
