LIU Gui-xiang, SHI Lu^*
（Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, China）

Abstract: In this study, major elements of 10 pyrite samples in metamorphic rocks of Archean Dongjiagou formation and Paleoproterozoic Liaohe Group have been analyzed by using the energy spectrum analysis technique of electron microscopy analysis. The results show that contents of chemical components of 10 pyrite samples are generally consistent with the chemical composition of standard pyrite. The main chemical compositions of 6 out of 10 pyrite samples mainly consist of 56.30%－65.42% of Fe and 34.58%－43.70% of S, belonging to the sulfur depleting pyrite which was formed in iron-rich but sulfur-poor environment; while the main chemical compositions of 4 out of 10 pyrite samples mainly consist of 40.61%－45.11% of Fe and 54.74%－59.39% of S, belonging to sulfur-saturated pyrite which was formed in iron-poor but sulfur-rich environment.

Keywords: Precambrian metamorphic rocks; pyrite; chemical composition; SEM/EDS analysis; eastern Liaoning Province

ACTA MINERALOGICA SINICA Vol. 39, No.1, 2019, page 126