Rare earth element (REE) is widely used in various fields of geology. Study of the existing forms of REE in geological objects is a necessity for us to solve geological problems related with REE. This paper tried to make it clear the existing forms of REE in gold-bearing pyrite in Jinshan gold deposit by stepwise dissolution test with ICP-MS analysis. Results showed that content of REE in fluid-inclusions of gold-bearing pyrite was very low, which only took about 0.07%-0.70% of the ∑REE, and that of pyrite phase took about 4.87%-17.00%,whereas higher REE contents of studied pyrites were mainly from Zr-rich silicate micro-mineral phase wrapped in sulfides, i.e., 82.30%-94.99%, which basically controlled the REE contents of pyrite. The REE contents in silicate phase accounted for part of ∑REE of the original liquids from which pyrite crystallized and was separated out. Therefore, the REE composition in pyrite mineral can be considered as the re-flection of the composition of pyrite-forming fluid. It is thus possible to trace the sources and features of ore-forming fluid by studying the characteristics of REE in pyrite.
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