Geochemistry and Zircon SHRIMP U-Pb Dating for Gneiss in Fuyun-Supute Belt of Xingjiang

The Supute gneiss complex is composed of andalusite,sillimanite,and cord ierite.It contains SiO₂ ranging from 63.1% to 68.3%,Al₂O₃ from 13.64% to 15.91%,TiO₂ from 0.53% to 0.77%,and relatively high MgO(mostly～3%).In line with their geochemical composition,they are metamorphized products of greywackes.For the trace elements,their total REE ranges from 155ppm to 272ppm and the LREE are enriched relative to the HREE with middle Eu negative anomalies.NASC normalized REE patterns of the Supute gneiss are coherently flat with insignificant Ce and Eu anomalies.Their geochemistry suggests that they are formed a long an active continental margin.Zircons from Supute gneiss show typical characteristics crystallized from magma and a SHR MIPU-Pb age of 282 Ma.Thus,the Supute gneiss represents an early Permian tectonomagmatic event.