| 滇东南建水二叠纪火山岩地球化学特征及其构造意义 |
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| 作者姓名： | 谢 静 常向阳 朱炳泉 |
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| 作者单位： | 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； ; |
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| 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。
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| 关 键 词： | 滇东南 师宗-弥勒断裂带 特提斯 地球化学 |
Geochemical Characteristics of Permian Volcanic Rocks from Jianshui,Southeast Yunnan and Their Tectonic Implication |
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| Authors: | XIE Jing CHANG Xiang-Yang ZHU Bing-Quan |
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| Institution: | 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 ; |
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| 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. |
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| Keywords: | Southeast Yunnan Shizong-Mile fault belt Tethys geochemistry |
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