Small-scale upper mantle convection beneath the Mongolia-Baikal Rift Zone and its geodynamic significance

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	Small-scale upper mantle convection beneath the Mongolia-Baikal Rift Zone and its geodynamic significance
	Xiong, Xiong ; Shan, Bin ; Wang, Ji-Ye ; Zheng, Yong
刊名	Chinese Journal of Geophysics-Chinese Edition
	2010
期号	7 页码:1594-1604
中文摘要	Small-scale upper mantle convection is one of the main mechanisms to control regional geodynamic processes. Some regional geodynamic processes in the Mongolia-Baikal Rift Zone (MBRZ) are suggested to be related to the small-scale upper mantle convection beneath the area. The aim of the present work is to study the small-scale upper mantle convection beneath the MBRZ by gravity data, and to investigate its contribution to the regional dynamics. Based on the equations relating regional isostatic gravity anomalies and small-scale upper mantle convection, the convection flow field beneath the MBRZ and convection-generated stress field were investigated by using the regional isostatic gravity anomalies data. The numerical results exhibit a very complicated pattern of the mantle convection and the generated stress field, which correlates well with the regional tectonics. The mantle flow and the stress beneath the Siberia Platform and Mongolian fold belt are weak, being consistent with the current inactive tectonics in these regions. A mantle upwelling and extension stress regime is found beneath the Baikal Rift Zone. The magnitude of the extension stress is low (similar to 8 MPa), suggesting that the mantle convection is not the cause responsible for the rifting of the Baikal rift. Mantle upwellings are also found beneath the Hangay Plateau, Altai and Gobi-Altai, leading to extension stress in these regions. The mantle upwellings may be the mechanism responsible for the uplift of the Hangay Plateau, and the dynamic background for defining the western boundary of the Amurian Plate.
原文出处	://WOS:000280431200010
公开日期	2012-04-11
内容类型	期刊论文
源URL	[http://ir.whigg.ac.cn/handle/342008/3385]
专题	测量与地球物理研究所_其他_期刊论文
推荐引用方式 GB/T 7714	Xiong, Xiong,Shan, Bin,Wang, Ji-Ye,et al. Small-scale upper mantle convection beneath the Mongolia-Baikal Rift Zone and its geodynamic significance[J]. Chinese Journal of Geophysics-Chinese Edition,2010(7):1594-1604.
APA	Xiong, Xiong,Shan, Bin,Wang, Ji-Ye,&Zheng, Yong.(2010).Small-scale upper mantle convection beneath the Mongolia-Baikal Rift Zone and its geodynamic significance.Chinese Journal of Geophysics-Chinese Edition(7),1594-1604.
MLA	Xiong, Xiong,et al."Small-scale upper mantle convection beneath the Mongolia-Baikal Rift Zone and its geodynamic significance".Chinese Journal of Geophysics-Chinese Edition .7(2010):1594-1604.