合川天青石矿床成矿地球化学及形成机理

The Mineralization Geochemistry and Formation Mechanism of Hechuan Celestine

四川合川天青石矿床位于合川县盐井镇之西2km处。矿床赋存在三迭纪含盐岩系中,矿体产在下三迭统嘉陵江组内,是我国重要的锶矿产地,共有五个主矿体,十个次要矿体,九个溶蚀残留矿体。矿体的厚度变化系数为49～90％,品位变化系数为57～65％;矿石组构虽然复杂,但其矿物组成比较简单,有用矿物主要为天青石。各类矿石的化学成分比较一致,主要组分SrO:37～50％,SO_3:29～39％。通过对矿石物质成分、矿化特征、稳定同位素分析,研究和总结了成矿控制、形成机理和成矿地球化学作用。认为本矿床应届沉积——改造类型的天青石矿床。

Hechuan celestine deposit of Sichuan is situated in 2 km west of Yanjing village in Hechuan county. The deposit exists in Triassic Period salt-bearing rock series. The orebodies which occur in Jialingjing formation of Lower Triassic Period are an important mineral resource of celestine. There are five major orebodies, ten secondary ones and nine corrosion residue ones. The thickn ess variation coefficient of the orebodies is 49～90％, the gread variation coeffieient is very simple. The main useful mineral is celestine. The chemical composition of each ore is relatively unanimous, The main constitution is SrO: 37～50％, SO_3: 29～30％. Mineralization control, formation mechanism mineralizing geochemistry are studyed and summaryed through the analysing of ore composition, mineralization, characteristiecs stable isotope. Therefore, the author considers the deposit to be a sedimentary-transform type of celestine.