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中国科学院大学学报 ›› 2006, Vol. 23 ›› Issue (3): 349-356.DOI: 10.7523/j.issn.2095-6134.2006.3.011

• 论文 • 上一篇    下一篇

滇东南建水二叠纪火山岩地球化学特征及其构造意义

谢 静; 常向阳; 朱炳泉   

  1. 1.中国科学院地质与地球物理研究所,北京100029;
    2.中国科学院研究生院,北京 100049;
    3.广州大学环境科学与工程学院,广州 510405;
    4.中科院广州地球化学研究所,广东,广州,510640;
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2006-03-15

Geochemical Characteristics of Permian Volcanic Rocks from Jianshui , Southeast Yunnan and Their Tectonic Implication

XIE Jing, CHANG Xiang-Yang, ZHU Bing-Quan   

  1. 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
    3.School of Environmental Science &Engineering, Guangzhou University, Guangzhou 510405, China
    4.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:1900-01-01 Revised:1900-01-01 Published:2006-03-15

摘要: 滇东南建水地区二叠纪火山岩构造侵位于师宗-弥勒断裂带的西南段,以玄武岩、玄武安山岩和安山岩为主,夹有少量苦橄岩。地质、地球化学特征显示其形成于弧后盆地环境,与建水地区石炭纪枕状熔岩相配套。显示扬子陆块和华夏陆块在晚古生代发生了板块俯冲,形成岛弧火山岩,二叠纪时产生弧后引张,形成弧后盆地。从晚古生代-早中生代,扬子陆块和华夏陆块之间可能存在一个复杂的沟弧盆体系。

关键词: 滇东南, 师宗-弥勒断裂带, 特提斯, 地球化学

Abstract: The Permian volcanic rocks from jianshui area tectonically intrude into southwest part of Shizong-Mile fault belt. It is mainly comprised of basalts、basaltic andesites、andesites and a little picrites. Geological and geochemical characteristics show that they are formed in back-arc environment, matching with Carboniferous pillow lava from Jianshui area. These imply that Yangtze block and Cathaysia block occur plate-subduction in late Paleozoic forming the island-arc volcanic rocks, and that they produce back-arc extension in Permian, then form back-arc basin. From late Paleozoic to early Mesozoic, there is a complex trench-arc-basin system between Yangtze and Cathaysia blocks.

Key words: Southeast Yunnan, Shizong-Mile fault belt, Tethys, geochemistry

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