| Deep Mechanical Background for the Cenozoic Volcanism in the Tibetan Plateau |
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| 作者姓名： | Xiong Xiong* Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China Wang Jiye Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Graduate School Chinese Academy of Sciences Beijing China Teng Jiwen Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China |
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| 作者单位： | Xiong Xiong* Institute of Geodesy and Geophysics，Chinese Academy of Sciences，Wuhan 430077，China; Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100101，China Wang Jiye Institute of Geodesy and Geophysics，Chinese Academy of Sciences，Wuhan 430077，China; Graduate School，Chinese Academy of Sciences，Beijing 100038，China Teng Jiwen Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100101，China |
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| 基金项目： | 中国科学院资助项目，中国科学院资助项目 |
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| 摘 要： | INTRODUCTION Volcanoesaremostlyobservedinoceanicridges,hotspotsandcontinentalriftzones(Hongetal.,2003),andarerarelyobservedincontinentalinteri ors.However,sincethevolcanoeswithintheconti nentinteriorscannotbeattributedtotheplate/block marginprocess,theydr…
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Deep Mechanical Background for the Cenozoic Volcanism in the Tibetan Plateau |
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| Xiong Xiong* Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan ,China, Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China Wang Jiye Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan ,China, Graduate School,Chinese Academy of Sciences,Beijing ,China Teng Jiwen Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China.Deep Mechanical Background for the Cenozoic Volcanism in the Tibetan Plateau[J].Journal of China University of Geosciences,2005,16(4). |
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| Authors: | Xiong Xiong Wang Jiye Teng Jiwen |
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| Abstract: | The principle prerequisite for the formation of a volcano is the generation of a channel for magma transportation. There is little research on the deep mechanical mechanism for the formation of a magma transportation channel in the Tibetan plateau.Based on the subcrustal mantle convection-generated stress field inversed by gravity anomalies, together with its relationship to the Cenozoic volcanism in the plateau, and the mechanism of crustal fracture formation, as well as the numerical results of the evolution of mantle convection beneath the plateau, this paper investigates the deep mechanical mechanism for the formation of a magma transportation channel in the Tibetan plateau. There are two significant extensional convection-generated stress zones beneath the plateau, in which the volcanic rocks in the central and northern parts of the plateau are distributed. The Linzizong volcanism in southern Tibet correlates the upwelling mantle flow prior to the India-Asia collision or during the early stage of the collision. The magnitude of the stress is ～100 MPa, which is the same order of force that causes crustal fractures. The evidence implies that the mantle convection-generated stress is one of the principle causes of crustal fractures, and furthermore, the formation of the magma transportation channel in the Tibetan plateau. |
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| Keywords: | mantle convection stress field Tibetan plateau volcanism magma channel |
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