摘要
从矿床地质、矿物组合和矿物包裹体等方面对九毛锡矿床的研究表明,成矿温度为160～405℃,压力约340～500bar,盐度为4.8～29.6wt%。成矿流体的同位素组成:氢同位素-43～-53‰、氧同位素2.94～7.53‰、总硫硫同位素-7.58～1.05‰,具岩浆水和混合硫源的特征。成矿流体沸腾作用是锡石沉淀和富矿石形成的重要机理。
The Jiumao tin deposit is a large deposit occuring in the ultrabasic rocks and Proterozoic Sibao Group.The study of fluid inclusion shows that the yield homogeneous temperatures are from 405℃ to 160℃,with the main ore-forming stage ranging from 300℃ to 160℃, and the Ore-forming pressure being about 500～340 bar,and pH, approximately 6.1 to 4.5.Isotope composition of sulfur,oxygen and hydrogen in main ore-forming stage are as follows:+1.05～-7.58%, +2.94～7.53% (SMOW) and-43～-53‰(SMOW).Boiling of the ore-forming fluid is a very powerful ore depositional mechanism.
关键词
锡矿床
液包体
成矿机理
广西
tin deposit
fluid inclusion
ore-forming mechanism
Guangxi
