| 滇西腾冲地区勐连花岗岩体南段LA-ICP-MS
锆石U-Pb定年及其构造意义 |
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| 引用本文： | 罗 改,贾小川,杨学俊,熊昌利,白宪洲,黄柏鑫,谭晓莲.滇西腾冲地区勐连花岗岩体南段LA-ICP-MS
锆石U-Pb定年及其构造意义[J].地质通报,2012,31(203):287-296. |
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| 作者姓名： | 罗 改 贾小川 杨学俊 熊昌利 白宪洲 黄柏鑫 谭晓莲 |
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| 作者单位： | 1. 四川省地质调查院，四川 成都，610081；
2. 成都理工大学，四川 成都，610059；
3. 四川省冶金地质勘查局成都地质调查所，四川 成都，610203 |
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| 摘 要： | 高黎贡构造带属于冈底斯地块东缘，滇西高黎贡花岗岩是冈底斯构造活动重要的岩浆记录。对高黎贡构造带的勐连花岗岩体南段的蒲川花岗岩地球化学特征进行的研究表明，蒲川花岗岩主要属于钙碱性-高钾钙碱性花岗岩，并表现出较强的过铝质特点；稀土元素配分模式曲线均表现为向右陡倾的LREE富集模式，具较弱的Eu负异常；花岗岩具后碰撞的特征，形成于主碰撞之后地壳向后碰撞-陆内转换的构造环境。LA-ICP-MS锆石U-Pb定年表明，蒲川花岗岩形成于早白垩世（128.9Ma±2.4Ma），年龄、地球化学特征与高黎贡构造带北部和中部一致，其形成可能是滇西怒江带碰撞作用的岩浆响应。
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| 关 键 词： | 滇西腾冲地区 勐连花岗岩 LA-ICP-MS锆石U-Pb定年 地球化学 高黎贡构造带 怒江带 |
LA-ICP-MS zircon U-Pb dating of southern Menglian granite in Tengchong area of western Yunnan Province and its tectonic implications |
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| LUO Gai,JIA Xiao-chuan,YANG Xue-jun,XIONG Chang-li,BAI Xian-zhou,HUANG Bai-xin,TAN Xiao-lian.LA-ICP-MS zircon U-Pb dating of southern Menglian granite in Tengchong area of western Yunnan Province and its tectonic implications[J].Geologcal Bulletin OF China,2012,31(203):287-296. |
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| Authors: | LUO Gai JIA Xiao-chuan YANG Xue-jun XIONG Chang-li BAI Xian-zhou HUANG Bai-xin TAN Xiao-lian |
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| Institution: | 1. Sichuan Institute of Geological Survey, Chengdu 610081, Sichuan, China;
2. Chengdu University of Technology, Chengdu 610059, Sichuan ,China;
3. Chengdu Geological Survey Institute, Sichuan Bureau of Metallurgical and Geological Exploration, Chengdu 610203, Sichuan,China |
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| Abstract: | Gaoligong tectonic belt is located in eastern Gandise block, and Gaoligong granites in western Yunnan constitute an important magmatic record of Gandise tectonic movement. Research on the geochemical characteristics of Puchuan granites in southern Menglian granites of Gaoligong tectonic belt suggests that these granites with strong peraluminous character can be assigned to high-K calc-alkaline granites. REE distribution patterns show steeply right oblique feature and enrichment of LREE, with weak negative Eu anomaly. Puchuan granites, with post-collision characteristics, were formed in a tectonic environment of transition from major collision to post-collision and inland. LA-ICP-MS U-Pb dating of zircons indicates that Puchuan granites were emplaced during the Early Cretaceous period (128.9±2.4Ma). Geochemical and chronological data of these granites are consistent to those of granites in northern and central Gaoligong tectonic belts. The formation of Puchuan granites might have been a magmatic response to collision of Nujiang tectonic belt in western Yunnan. |
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| Keywords: | Tengchong area western Yunnan Menglian granite LA-ICP-MS U-Pb dating of zircon geochemistry Gaoligong tectonic belt Nujiang tectonic belt |
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