SHRIMP U-Pb Ages and Petrology Studies on the Potassic and Podic Rhyolites in Altai, oft-com:office:smarttags" />North Xinjiang
详细信息
- 责任者：Shan Qiang (Key Laboratory of Metallogenic Dynamics ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Zeng Qiaosong
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(12)
- 关键词：流纹岩 ; rhyolites ; 铀—铅计时 ; U-Pb dating ; 阿尔泰山 ; Altai Mountains
- 页码：p.3653-3665
- 图表：7 illus., 2 tables, 62 refs.
- 分类号：0801
- 出版序号：20122311
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The acidic volcanic rocks of the Kangbutiebao Formation crop out mainly in Maizi, Kelang, Chonghuer and Ashele volcanic-sedimentary basins on the southern margin of Altai Mountains. The SHRIMP zircon U-Pb dating and geochemical characteristics of potassic rhyolites (TM1, Tiemuerte area) and sodic rhyolites (KK7, Keketale area) were studied. The characteristics of phase separation and enrichment accord with the distribution principle of trace elements between conjugated sodic melts and potassic silicate melts under a condition of magmatic liquid immiscibility, therefore, both potassic rhyolites and sodic rhyolites are the products of liquid immiscibility of the acidic magma with high volatile derived from the partial melting of upper crust.