The Geochemical Characteristics of Late-Triassic Volcanic Rocks from Wengshui in Zhongdian Area, Yunnan and Tectonic Significant
详细信息
- 责任者：Chen Ling (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Xu Jifeng
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(4)
- 关键词：火山岩 ; volcanic rocks ; 云南 ; Yunnan Province
- 页码：p.1156-1166
- 图表：illus., 2 tables, 47 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
It has not been reported at presen0t of arc magmatic activities for Late Triassic in northern zhongdian arc of Sanjiang tectonic belt. Our petrological and chronological researches show that the intermediate-acid magmatic activity of Indosinian developed in Wengshui areas of Zhongdian arc; zircon U-Pb dating indicates that the volcanic rocks in Wengshui area were erupted at 211.1±1.5Ma, which is similar to ages of other Indosinian volcanic rocks and ore-bearing porphyric rocks in southern Zhongdian area. The Wengshui volcanic rocks mainly consist of andesites and show depletion of high field strength elements such as Nb, Ta, Ti similar to arc volcanic rocks. Compared with Lannitang-Langdu andesites from southern area of Zhongdian arc, the both clearly show compositional signature of an arc volcanic rock. Combining their age and tectonic background, we conclude that Wengshui andesites, Lannitang-Langdu andesites and ore-bearing porphyric rocks from Zhongdian area were most likely formed by a same tectono-magmatic event, which were generated by westward subduction of the Ganzi-Litang in Late-Triassic.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |