Geochemical Constrains on the Petrogenesis and Tectonic Setting Discrimination of Volcanic Rocks from the Baimianxia and the Sanwan Formations
详细信息
- 责任者：Xu Xueyi (Xi’ an Center of Geological Survey ; CGS ; Xi’an 710054 ; China) ; Cheng Junlu
- 刊名：Acta Geologica Sinica
- 出版年：2009
- 卷期：83(11)
- 关键词：火山岩 ; volcanic rocks ; 构造环境 ; tectonic setting ; 扬子地台 ; Yangtze Platform
- 页码：p.1703-1718
- 图表：13 illus., 3 tables, 57 refs.
- 分类号：0801
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
On the basis of petrogeochemical data, the volcanic lavas of Baimianxia Formation can be classified into two major parts. These are a high TiO2 (>1%) type situated in lower part with high-grade metamorphism, and low TiO2 (<1%) type situated in upper part with low-grade metamorphism. The samples of basalts and andesites show they are derived from depleted mantle source similar to N-MORB. Finally, the authors conclude that the lavas in upper part of Baimianxia Formation represent the geological records of rift-related volcanism in Middle Proterozoic.