lang=EN-US>Geological Significance and Geochemical Characteristics of Permian Rhyolite from the Eastern Section of Bogeda Orogenic Belt, Xinjiang
详细信息
- 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
摘要
lang=EN-US>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.