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Volume 16 Issue 4
Dec 2005
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Xiong Xiong, Jiye Wang, Jiwen Teng. Deep Mechanical Background for the Cenozoic Volcanism in the Tibetan Plateau. Journal of Earth Science, 2005, 16(4): 334-339.
Citation: Xiong Xiong, Jiye Wang, Jiwen Teng. Deep Mechanical Background for the Cenozoic Volcanism in the Tibetan Plateau. Journal of Earth Science, 2005, 16(4): 334-339.

Deep Mechanical Background for the Cenozoic Volcanism in the Tibetan Plateau

Funds:

the National Natural Science Foundation of China 40274037

the National Natural Science Foundation of China 40474028

Chinese Academy of Sciences KZCX3SW153

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  • 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 convectiongenerated 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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