Qushenla Formation Volcanic Rocks in North Lhasa Block: Products of Bangong Co-Nujiang Tethy’s Southward Subduction
详细信息
- 责任者：Kang Zhiqiang (Guangxi Center of Geologic Engineering Key Laboratory ; School of Earth Science ; Guilin University of Technology ; Guilin 541004 ; China) ; Xu Jifeng
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(10)
- 关键词：火山岩 ; volcanic rocks ; 西藏 ; Tibet
- 页码：p.3106-3116
- 图表：5 illus., 2 tables, 72 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Studying the Mesozoic volcanic rocks widely exposed in Lhasa block can better understand the geological evolution of the Tethys and construction of the whole Tibet Plateau. In present study, major, trace element compositions and isotopic results of Qushenla Formation in north Lhasa block have been reported. The volcanic rocks from Qushenla Formation mainly consist of medium-K calc-alkaline series, including basalt, basalt-andesite and andesite. In the spider diagram, they show the character of enrichment of LILE （Rb, Ba, Th, U） and depletion of HFSE （Nb, Ta, Ti）, similar to those of an island arc volcanic rock.