| 西藏当惹雍错吉松环斑花岗岩的发现及地质意义 |
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| 引用本文： | 陈振华,刘云,李均良.西藏当惹雍错吉松环斑花岗岩的发现及地质意义[J].沉积与特提斯地质,2006,26(2):16-20. |
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| 作者姓名： | 陈振华 刘云 李均良 |
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| 作者单位： | 江西省地质调查研究院,江西,南昌,330201 |
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| 基金项目： | 中国地质调查局“1∶25万邦多幅区域地质调查” |
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| 摘 要： | 在1∶25万区域地质调查工作中,于当惹雍错中部的吉松一带发现环斑花岗岩,获同位素K-Ar法年龄45.3Ma,时代为始新世。吉松环斑花岗具特殊的卵状环斑结构,K2O Na2O含量较高,K2O>Na2O;稀土元素含量高,具明显的铕亏损,为造山型环斑花岗岩,形成于青藏高原陆内碰撞造山晚期的后碰撞环境。
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| 关 键 词： | 当惹雍错 吉松 环斑花岗岩 始新世 西藏 |
| 文章编号： | 1009-3850（2006）02-0016-05 |
| 收稿时间： | 2005-03-02 |
| 修稿时间： | 2005-03-022006-04-08 |
The discovery and significance of the rapakivi granites in Gyisong,Tangra Yumco,Xizang |
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| CHEN Zhen-hu,LIU Yun,LI Jun-liang.The discovery and significance of the rapakivi granites in Gyisong,Tangra Yumco,Xizang[J].Sedimentary Geology and Tethyan Geology,2006,26(2):16-20. |
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| Authors: | CHEN Zhen-hu LIU Yun LI Jun-liang |
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| Institution: | Jiangxi Institute of Geological Survey, Nanchang 330201, Jiangxi, China |
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| Abstract: | The rapakivi granites were discovered during the 1:25 000 regional geological survey in Gyisong, Tangra Yumco, Xizang. These granites give a K-Ar age of 45.3 Ma and may be traced back to the Eocene. They are characterized by special oval rapakivi textures, higher K2O +Na2O contents, K2O >Na2O, higher REE contents and depletion of the element Eu, and thus belong to the orogenic rapakivi granites originated from the intracontinental post-collisional settings during the later stages of collision and mountain building of the Qinghai-Xizang Plateau. |
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| Keywords: | Tangra Yumco Gyisong rapakivi granite Eocene Xizang |
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