Lei Y.-X.,Xian Institute of Geology and Mineral Resources |
Zhou G.,No. 4 Geology Pary of Xinjing Bureau of Geology and Mineral Reources |
Qin J.-H.,No. 4 Geology Pary of Xinjing Bureau of Geology and Mineral Reources |
Zhang L.-W.,No. 4 Geology Pary of Xinjing Bureau of Geology and Mineral Reources |
And 2 more authors.
Northwestern Geology | Year: 2010
The Supute gneiss complex is composed of andalusite, sillimanite, and cordierite. It contains SiO 2 ranging from 63.1% to 68.3%, Al 2O 3 from 13. 64% to 15. 91%, TiO 2 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 along an active continental margin. Zircons from Supute gneiss show typical characteristics crystallized from magma and a SHRIMP U-Pb age of 282 Ma. Thus, the Supute gneiss represents an early-Permian tectonomagmatic event.