College of Earth Sciences, Jilin University, Changchun 130061, China

The garnet-mica schist is an important ore-hosting rock of the Gaojiapuzi silver deposit. The results of petrogeochemical analyses show that the garnet-mica schist has the characteristics of metamorphic rock, and is enriched in large ion lithophile elements (Th, K), depleted in high field strength elements (Nb, Ta, Ti), with relatively high total amount of rare earth elements (with ��REE average value of 169.28×10^-6). It also shows obvious fractionation of light and heavy rare earth elements, and is enriched in light rare earth elements, with a weak positive ��Ce anomaly and medium negative ��Eu anomaly. According to field observation and geochemical characteristics, the original rocks of garnet-mica schist in Gaojiapuzi silver mine are restored to mudstone, sandstone and miscellaneous sandstone, which show the characteristics of felsic materials from upper crust, and was formed in passive continental margin environment.