| 西天山阿吾拉勒石炭纪火山岩年代学和地球化学研究 |
| |
| 关键词:Zircon LA-ICP-MS geochemistry volcanic arc Dahalajunshan Formation Awulale area |
| 基金项目:中国地质调查局天山成矿带地质矿产调查评价项目(编号: 1212011120497) |
|
| 摘要点击次数: 4043 |
| 全文下载次数: 1209 |
| 摘要: |
| Zircon U-Pb Chronology and Geochemistry of Carboniferous Volcanic Rocks in Awulale Area, Western Tianshan Mountains |
| Carboniferous volcanic rocks are widespread in Awulale rift zone area. Geochemical data suggest that they belong to calc-alkalic series, and consist of basalt, trachybasalt, basaltic trachyandesite, basaltic andesite, trachyte and rhyolite. LA-ICP-MS zircon dating of the rocks yielded an isotopic age of (316.1±2.2) Ma, which represents the late Early Carboniferous. Their major and trace element geochemistry shows that these volcanic rocks are characterized by the enrichment of large ion lithophile elements, suggesting that they had a very intimate relationship with volcanic-arc rocks and probably resulted from the northward sudbuction of the Junggar Ocean beneath the Ili-Middle Tianshan Plate. They might have been formed from a partially melted (about 1%~5%) lithospheric mantle (probably spinel-lherzolite) source that had been enriched with subduction fluids, and experienced extensive fractional crystallization and crustal contamination before eruption. |
| LI Da-peng,DU Yang-song,PANG Zhen-shan,TU Qi-jun,ZHANG Yong-ping,GE Song-sheng,SHEN Li-jun,WANG Kai-hu.2013.Zircon U-Pb Chronology and Geochemistry of Carboniferous Volcanic Rocks in Awulale Area, Western Tianshan Mountains[J].Acta Geoscientica Sinica,34(2):176-192. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|