| 冈底斯带别若则错地区美苏组高Nb-Ta酸性火山岩锆石U-Pb年龄、地球化学特征及地质意义 |
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| 引用本文： | 魏永峰,肖倩茹,罗巍,邱婵媛,邓泽锦,赵志强,林美英. 冈底斯带别若则错地区美苏组高Nb-Ta酸性火山岩锆石U-Pb年龄、地球化学特征及地质意义[J]. 地质通报, 2018, 37(6): 1015-1025 |
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| 作者姓名： | 魏永峰 肖倩茹 罗巍 邱婵媛 邓泽锦 赵志强 林美英 |
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| 作者单位： | 四川省地质矿产勘查开发局区域地质调查队;成都理工大学地球科学学院 |
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| 基金项目： | 中国地质调查局项目《西藏班公湖-怒江成矿带地质矿产调查》（编号：12120113036600） |
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| 摘 要： | 别若则错地区美苏组构造上处于北冈底斯南缘,其中流纹岩的LA-ICP-MS锆石~(206)Pb/~(238)U年龄为39.62±0.77Ma,时代为晚始新世。岩石具高Si O_2(72.85%~78.54%)、富碱(Alk=6.36%~8.47%)、贫Ca O(0.33%~1.56%)和Mg O(0.08%~0.58%)特征,A/CNK=0.99~1.35,属于弱铝质-过铝质碱性系列。稀土元素总量为122.52×10~(-6)~208.35×10~(-6),(La/Yb)_N值为7.27~16.11,δEu=0.13~0.26,在球粒陨石标准化稀土元素分布模式上表现为Eu的右倾V字形。微量元素Nb(38.1×10~(-6)~88.7×10~(-6))、Ta(3.36×10~(-6)~6.35×10~(-6))高,Rb、K、Th、Ce、Zr、Hf相对富集,Ba、Sr、P、Ti强烈亏损。岩石地球化学特征表明,别若则错地区美苏组酸性火山岩"集壳幔特性于一身",是初始熔体为富碱和富Nb、Ta的幔源玄武质岩浆与壳源岩浆以某一特定比例混合/混染的产物。初步认为,美苏组酸性火山岩产出于大陆板内伸展(裂谷)环境,其地球动力学背景与南侧新特提斯洋壳向北俯冲,导致高原内部的陆内俯冲、走滑剪切与地壳缩短有关。
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| 关 键 词： | 冈底斯带 别若则错地区 美苏组 高Nb-Ta LA-ICP-MS锆石U-Pb定年 地球化学 |
| 收稿时间： | 2017-04-20 |
| 修稿时间： | 2017-12-19 |
Zircon U-Pb age, geochemistry and geological signifi-cance of high Nb-Ta acid volcanic rocks from Meisu Formation, Bieruo-Zecuo area, Gangdise belt |
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| WEI Yongfeng,XIAO Qianru,LUO Wei,QIU Chanyuan,DENG Zejin,ZHAO Zhiqiang and LIN Meiying. Zircon U-Pb age, geochemistry and geological signifi-cance of high Nb-Ta acid volcanic rocks from Meisu Formation, Bieruo-Zecuo area, Gangdise belt[J]. Geologcal Bulletin of China, 2018, 37(6): 1015-1025 |
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| Authors: | WEI Yongfeng XIAO Qianru LUO Wei QIU Chanyuan DENG Zejin ZHAO Zhiqiang LIN Meiying |
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| Affiliation: | Regional Geological Surveying Party, Sichuan Bureau of Geology and Mineral Resources Development, Shuangliu 610213, Sichuan, China;College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,Regional Geological Surveying Party, Sichuan Bureau of Geology and Mineral Resources Development, Shuangliu 610213, Sichuan, China;College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China,Regional Geological Surveying Party, Sichuan Bureau of Geology and Mineral Resources Development, Shuangliu 610213, Sichuan, China,Regional Geological Surveying Party, Sichuan Bureau of Geology and Mineral Resources Development, Shuangliu 610213, Sichuan, China and Regional Geological Surveying Party, Sichuan Bureau of Geology and Mineral Resources Development, Shuangliu 610213, Sichuan, China |
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| Abstract: | |
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| Keywords: | Gangdise belt Bieruo-Zecuo area Meisu Formation high Nb-Ta LA-ICP-MS zircon U-Pb dating geochemistry |
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