| 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 |
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| 引用本文： | 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(2-3): 190-198. |
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| 作者姓名： | 孙崇波 李忠权 王道永 许远平 李滔 赵云川 |
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| 作者单位： | 1.国土资源部构造成矿成藏重点实验室 (成都理工大学)/油气藏地质及开发工程国家重点实验室 (成都理工大学), 四川 成都 610059; 2.四川冶金地质勘查局水文工程大队, 四川 成都 611730 |
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| 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） |
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| 摘 要： | 对云南绿春县仰宗流纹斑岩进行了锆石U-Pb年龄、岩石地球化学分析。LA-ICP-MS锆石U-Pb测年显示，仰宗流纹斑岩年龄为263.1±2.3Ma，形成于晚二叠世。岩石地球化学分析显示，仰宗流纹斑岩SiO2含量为71.08%~80.26%，全碱（Na2O+K2O）含量为4.67%~8.67%，且Na2O＜K2O；岩石轻、重稀土元素存在一定的分馏，负Eu异常明显（δEu=0.05~0.57），相对富集Rb、Th、U、Ni、Cs、Zr、Hf、As、K等元素，亏损Sr、Ta、Ba、Cr、Zn、W等元素。结果显示，仰宗流纹斑岩形成于碰撞期后的陆内构造环境，表明哀牢山构造带的古特提斯支洋或弧后盆地在晚二叠世（263.1±2.3Ma）可能已经闭合。
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| 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 |
| 收稿时间： | 2015-12-09 |
| 修稿时间： | 2016-09-11 |
Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt |
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| SUN Chongbo, LI Zhongquan, WANG Daoyong, XU Yuanping, LI Tao, ZHAO Yunchuan. Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt[J]. Geological Bulletin of China, 2017, 36(2-3): 190-198. |
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| Authors: | SUN Chongbo LI Zhongquan WANG Daoyong XU Yuanping LI Tao ZHAO Yunchuan |
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| Affiliation: | 1.Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources (Chengdu University of Technology)/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology) Chengdu 610059, Sichuan, China; 2.Hydro-Engineering Party of Sichuan Metallurgical Geology and Exploration Bureau, Chengdu 611730, Sichuan, China |
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| 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). |
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| Keywords: | rhyolite porphyry LA-ICP-MS zircon U-Pb ages petrogeochemistry intraplate granite |
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