滇东南建水二叠纪火山岩地球化学特征及其构造意义  

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

作　　者：谢静[1] 常向阳[2] 朱炳泉[3] 

机构地区：[1]中国科学院地质与地球物理研究所 [2]广州大学环境科学与工程学院,广州510405 [3]中国科学院广州地球化学研究所,广州510640

出　　处：《中国科学院研究生院学报》2006年第3期349-356,共8页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：国家自然科学基金项目(40073001);国家973项目(G19990043215)联合资助

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,形成了弧后盆地.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.The Permian volcanic rocks from Jianshui area tectonically intruded 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 Carboniferous pillow lava from Jianshui area. These imply that Yangtze block and Cathaysia block occurred plate-subduction in late Paleozoic forming the island-arc volcanic rocks, and that they produced back-arc extension in Permian, then formed back-arc basins. From late Paleozoic to early Mesozoic, there was a complex trench-arc-basin system between Yangtze and Cathaysia blocks.

关 键 词：滇东南 师宗-弥勒断裂带 特提斯 地球化学 

分 类 号：P59[天文地球—地球化学]