| 西藏冈底斯当惹雍错-许如错南北向地堑的特征及成因 |
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| 引用本文： | 曹圣华,李德威,余忠珍,徐祖丰,唐峰林.西藏冈底斯当惹雍错-许如错南北向地堑的特征及成因[J].地球科学,2009,34(6):914-920. |
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| 作者姓名： | 曹圣华 李德威 余忠珍 徐祖丰 唐峰林 |
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| 作者单位： | 1.中国地质大学地球科学与资源学院, 北京 100083 |
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| 基金项目： | 国家重大基础研究前期研究专项(No.2005CCA05600); 国家自然科学基金项目(No.40572113); 中国地质调查局项目(No.20001300000141) |
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| 摘 要： | 当惹雍错-许如错南北向地堑位于青藏高原冈底斯中部, 由一组南北向高角度正断层与夹其中间的当穹错、当惹雍错、许如错等3个湖泊盆地构成.地堑发育于中新世晚期, 一直活动到全新世.沿着地堑边缘分布中新世碱性火山岩.白榴石响岩的K-Ar年龄为12.6Ma, 其岩石化学特征显示出陆内伸展构造环境.地堑内部发育晚更新世至全新世的湖相沉积物.当惹雍错-许如错地堑是在青藏高原板内构造隆升过程中, 层流加厚的下地壳热垫作用导致上地壳发生伸展作用, 随着青藏高原地壳物质的东流, 南北向伸展作用转向东西向伸展作用, 形成近南北走向的地堑.
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| 关 键 词： | 南北向地堑 构造地质 晚新生代 当惹雍错-许如错 青藏高原 |
| 收稿时间： | 2008-09-12 |
Characteristics and Mechanism of the Dangra Yun Co and Xuru Co NS-Trending Graben in the Gangdese,Tibet |
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| CAO Sheng-hua,LI De-wei,YU Zhong-zhen,XU Zu-feng,TANG Feng-lin.Faculty of Earth Sciences , Resources,China University of Geosciences,Beijing,China.Jiangxi Institute of Geological Survey,Jiangxi,China.Faculty of Earth Sciences,Wuhan,China.Characteristics and Mechanism of the Dangra Yun Co and Xuru Co NS-Trending Graben in the Gangdese,Tibet[J].Earth Science-Journal of China University of Geosciences,2009,34(6):914-920. |
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| Authors: | CAO Sheng-hua LI De-wei YU Zhong-zhen XU Zu-feng TANG Feng-linFaculty of Earth Sciences Resources China University of Geosciences Beijing ChinaJiangxi Institute of Geological Survey Jiangxi ChinaFaculty of Earth Sciences Wuhan China |
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| Institution: | CAO Sheng-hua1,2,LI De-wei3,YU Zhong-zhen2,XU Zu-feng2,TANG Feng-lin21.Faculty of Earth Sciences and Resources,China University of Geosciences,Beijing100083,China2.Jiangxi Institute of Geological Survey,Jiangxi330030,China3.Faculty of Earth Sciences,Wuhan430074,China |
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| Abstract: | The Dangra Yun Co and Xuru Co NS-trending graben located at central section of the Gangdese,is controlled by NS-trending high-angle normal faults and consists of the Dangqung Co,Dangra Yun Co and Xuru Co. Miocene alkati volcanic rock distributed along the graben indicates an intraplate extensional tectonic environment by its petrochemical and geochemical analyses. A 12.6Ma age is determined for leucite phonolite by the K-Ar method,and it is found that graben occurred at the late time of Miocene (about 13Ma)... |
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| Keywords: | NS-trending graben structural geology Late Cenozoic Dangra Yun Co and Xuru Co the Qinghai-Tibet plateau |
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