line-level: 2" class=MsoNormal>Geological Significance and Geochemical Characteristics of Permian Rhyolite from the Eastern Section of Bogeda Orogenic Belt, Xinjiang
Permian volcanic rocks consist of acidic volcanics and pyroclastic rocks, and the Rb-Sr isochronal age of rhyolite is (278±2) Ma. Rhyolite has the characteristics of high Si and low Al, enriched K and deleted Na, and enriched strong incompatible elements and LREE, and relatively Nb-Ta negative anomaly, especially strong Sr, P and Ti negative anomaly, and significantly δEu negative anomalies. Therefore, these geochemical characteristics reveal that permian acidic volcanic rocks are the results of the partial melting of the intermediate-basic substance.