Lanthanide Kinked Shape, Similar to Tetrad Effect, Observed in Sub-Volcanic Rocks from Qiaga, Southern Tibet, oft-com:office:smarttags" />China

详细信息   

• 责任者：Hu Guyue (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zeng Lingsen
• 刊名：Geological Bulletin of China
• 出版年：2011
• 卷期：30(1)
• 关键词：流纹岩 ; rhyolites ; 浅成岩 ; hypabyssal rocks ; 稀土元素 ; rare earths ; 西藏 ; Tibet
• 页码：p.82-94
• 图表：8 illus., 1 table, 78 refs.
• 分类号：0801
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

 Qiaga sub-volcanic rocks intruded into the southern-eastern Tethys Himalaya, between the Yardoi gneiss dome to the north and South Tibetan Detachment System to the south. Based on the study by thin-section and whole-rock geochemical analysis, it is classified as rhyolitic sub-volcanic rock. The results indicate that these rhyolitic sub-volcanic rocks are rich in silicon, aluminum, alkalis, poor in calcium, magnesium and total iron. Based on the former tetrad effect researchs, the authors concluded that after magmatic-hydrothermal alteration, the REE distribution pattern in high-silica peraluminous magma can be a "kinked" shape, similar to tetrad effect, which has positive Gd anomaly.