Compositional Zone Investigation of Clinopyroxene Phenocryst in the Cenozoic Ultra-Potassic Rocks from the Middle-Southern Lhasa
详细信息
- 责任者：Yu Lifang (Instrumental Analysis and Research Center ; Sun Yat-Sen University ; Guangzhou 510275 ; China) ; Zhao Wenxia
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(12)
- 关键词：火山岩 ; volcanic rocks ; 单斜辉石 ; clinopyroxene ; 西藏 ; Tibet
- 页码：p.3666-3674
- 图表：7 illus., 4 tables, 20 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The ultra-potassic volcanic rocks in Mibale, Maigaxiang, Sailipu areas occur in middle-southern Lhasa block, Tibetan Plateau. A large number of normal zones in clinopyroxene phenocrysts have been recognized in these ultra-potassic volcanic rocks, which have recorded the early crystallizing history of the magmas. Although erupted times of ultra-potassic rocks in the three areas were slightly different, core compositions of clinopyroxene normal zones are same each other, and they show a similar Al-Ti variation, indicating that the ultra-potassic rocks from three areas were formed in a tectonic setting and had a same magmatic genesis.