地质通报2017，Vol.36Issue(2)：190-198,9.
云南哀牢山构造带仰宗流纹斑岩锆石U-Pb年龄、地球化学特征及其构造意义
Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyo-lite porphyry along Ailao Mountain tectonic belt
摘要
Abstract
This paper presents bulk petrogeochemistry and zircon U-Pb dating results for the Yangzong rhyolite porphyry in Luchun County, Yunnan Province. LA-ICP-MS zircon U-Pb dating results show that the Yangzong rhyolite porphyry was formed in the Late Permian (263.1±2.3Ma). The Yangzong rhyolite porphyry is characterized by SiO2 content of 71.08%~80.26%, alkali (Na2O+K2O) 4.67%~8.67%, and Na2O<K2O. It is enriched in LREE and Rb, Th, U, Ni, Cs, Zr, Hf, As, K and depleted in Sr, Ta, Ba, Cr, Zn, W with negative Eu anomalies (δEu=0.05~0.57). According to the diagrams, the Yangzong rhyolit porphyry was formed in the tectonic environment of island arc-continent or continental-arc collision,indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailao Mountain tectonic belt might have been closed in the Late Permian (263.1±2.3Ma).关键词
流纹斑岩/LA-ICP-MS锆石U-Pb年龄/岩石地球化学/板内型花岗岩Key words
rhyolite porphyry/LA-ICP-MS zircon U-Pb ages/petrogeochemistry/intraplate granite分类
天文与地球科学引用本文复制引用
孙崇波,李忠权,王道永,许远平,李滔,赵云川..云南哀牢山构造带仰宗流纹斑岩锆石U-Pb年龄、地球化学特征及其构造意义[J].地质通报,2017,36(2):190-198,9.基金项目
中国地质调查局项目《西南三江成矿带南段基础地质调查》(编号:1212010880406、1212011120582) （编号:1212010880406、1212011120582）
