Oxygen isotopes vary with the water cycle, and sulfur with bedrock, so they're location proxies.
氧同位素会随着大气水循环而变化，硫同位素则根据地球岩床的不同而变化，通过它们我们就能确定地理位置。
2
The reformation has led to the homogenization of sulfur and lead isotopes in the ore deposit.
改造的结果使得矿床的硫、铅同位素产生均一化作用。
3
Based on the fractionation of carbon and sulfurisotopes in the process of petroleum generation and evolvement, the crude oils and their sources in the Tarim Basin have been discussed.