粤东锡多金属矿床硫同位素地球化学研究

SULFUR ISOTOPE GEOCHEMICAL STUDIES OF THE TIN-POLYMETALLIC DEPOSITS IN EASTERN GUANGDONG PROVINCE

本文分析了粤东锡多金属矿床,花岗岩类和沉积岩的硫同位素成分和特征,揭示了硫从硫源转移到矿床过程中同位素组成的变化规律,确定了矿床硫的来源。

Two main aspects of sulfur isotope of the tin-polymetallic deposits in eastern Guangdong have been found out. One is that isotope equili-bria between coexisting sulfides does not reach in each deposit.The other is that there is obvious difference in sulfur isotope between the east and west minerogenetic belts. The sulfur-isotopic compositions of the depostis in the east belt are more than zero.but those in the west belt less than zero.The sulrue isotope disequilibrium results form the mixing of hydrothermal solutions with different isotope compositions.The difference in isotope composition indicates that the main sulfur sources of the deposits in the two minerogenetic belts are differentThe sulfur of the deposits in the east belt derives mainly from granitoids, but that in the west belt mainly from sedimentary strata.