| 哀牢山缝合带中两类火山岩地球化学特征及其构造意义 |
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| 引用本文： | 董云鹏,朱炳泉,常向阳.哀牢山缝合带中两类火山岩地球化学特征及其构造意义[J].地球化学,2000,29(1):6-13. |
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| 作者姓名： | 董云鹏 朱炳泉 常向阳 |
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| 作者单位： | 中国科学院广州地球化学研究所!广东广州510640 |
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| 基金项目： | 中国科学院重大资助!KZ951-B1-413，“九五”国家攀登预选资助!95-预-25 |
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| 摘 要： | 在哀牢山构造带的哀牢山断裂与花山－雅邑断裂之间出路大量不同构造环境的岩浆岩。除双沟蛇绿岩外，尚发现有景东火山岩和墨江火山岩。地球化学研究表明，景东火山岩具有类似于富集型洋中脊玄武岩（Ｐ－ＭＯＲＢ）地球化学特征，形成于以双沟蛇绿岩为代表的哀牢山洋盆先期的陆内裂谷构造环境；墨江火山岩具有岛弧火山岩地球化学特征，形成于哀牢山洋盆向西俯冲消减作用下的岛弧构造环境。景东裂谷型火山岩和墨江岛弧火山岩分别代表了
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| 关 键 词： | 缝合带 构造演化 火山岩 地球化学 云南 |
Geochemistry of the two-type volcanic rocks from Ailaoshan suture zone and their tectonic implication |
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| DONG Yun-peng, ZHU Bing-quan, CHANG Xiang-yang, DENG Shang-xian.Geochemistry of the two-type volcanic rocks from Ailaoshan suture zone and their tectonic implication[J].Geochimica,2000,29(1):6-13. |
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| Authors: | DONG Yun-peng ZHU Bing-quan CHANG Xiang-yang DENG Shang-xian |
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| Abstract: | Mass of magmas formed in different tectonic settings was revealed between the Ailaoshan fault and Huashan-Yayi fault based on the detailed mapping in Ailaoshan tectonic belt. Except of Shuanggou ophiolite, the two-type volcanic rocks from Jingdong and Mojiang are reported here in order to provide some evidences and information for understanding the tectonic evolution of the Ailaoshan tectonic belt. Studies on the geochemistry suggest that the geochemical characteristics of the volcanic rocks from Jingdong area are similar to that of the P-MORB.Based on the regional geological studies, it was indicated that the Jingdong volcanic rocks formed in a continental rifting setting before the opening stage of the Ailaoshan oceanic basin represented by the Shuanggou ophiolite. The geochemical characteristics of the Mojiang volcanic rocks showing the typical island arc signature suggest that these rocks formed in an island arc setting caused by the subduction of oceanic crust of Ailaoshan oceanic basin from east to west. The Jingdong rift volcanic rocks and Mojiang island arc volcanic rocks represent the two sorts of magmas formed in the former and end stages of the evolutionary process of Ailaoshan oceanic basin, respectively. Exceeding of the Jingdong rift volcanic rocks, Mojiang island arc volcanic rocks and Shuanggou ophiolite suggest that there exists a plate tectonic evolutionary process from continental rifting, opening of oceanic basin, subduction of oceanic crust, collision between Indo-China block and North China block. |
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| Keywords: | suture zone tectonic evolution volcanic rocks geochemistry Ailao Shan Yunnan Province |
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