line-level: 2" class=MsoNormal>Geological Significance and Geochemical Characteristics of Permian Rhyolite from the Eastern Section of Bogeda Orogenic Belt, Xinjiang

• 责任者：Di Pengfei (School of Resources and Environmental Sciences ; Lanzhou University ; Lanzhou 730000 ; China) ; Li Taide
• 刊名：Journal of Lanzhou University (Natural Sciences)
• 出版年：2010
• 卷期：46(3)
• 关键词：流纹岩 ; rhyolites ; 新疆 ; Xinjiang
• 页码：p.8-13,19
• 图表：6 illus., 3 tables, 32 refs.
• 分类号：0801
• issnNo：ISSN0455-2059
• isbnNo：CN62-1075/N

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.