山西代县碾子沟金红石矿床蚀变温度

测试山西代县碾子沟金红石矿床细晶直闪石中原生气体包裹体和气液包裹体均一温度分别为790～825℃、756～780℃,分别代表了细晶直闪石化早期、中后期的温度。镁电气石中原生气体包裹体均一温度高于800℃,据气液比分析,相当于细晶直闪石化早期的温度,其形成的时空分离性主要由蚀变介质物质成分差异所致。类比分析了其它蚀变阶段的温度。总体上看,矿床蚀变属高温蚀变。蚀变温度明显高于围岩变质温度和高温热液矿床的温度,略低于矽卡岩化温度。高温使钛、铁离子的动能和活性大幅度提高,蚀变介质的存在使离子具备了良好的迁移条件,从而使钛铁离子完全分离、钛进一步富集并形成了金红石矿床。

ALTERATION TEMPERATURE OF NIANZIGOU RUTLE DEPOSIT IN DAI COUNTY, SHANXI PROVINCE

The homogenization temperature of the juvenile gas inclusion and the gas-liquid inclusion in aplite anthophyllite of Nianzigou rutile deposit from Daixian,Shanxi province are from 790 to 825℃ and from 756 to 780℃,both of which represent the early and middle-upper stage tempreture of aplite anthophyllite.The homogenization temperature of Juvenile gas inclusion in dravite is equivalent to the temperature of early stage which is over 800℃.The component difference of alteration medium caused the space-time separability.We concludes that the deposit alteration belongs to the high-temperature alteration,which is higher than the temperature of wall rock metamorphic and high-temperature hydrothermal solution deposit but lower than the skarnizaton temperature.With the better moving conditions for the ion which has the high kinetic energy and activity,the titanium and iron ion separated,so the titanium enrichment form the rutile deposit.