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青藏高原递进式隆升的力学模式

, PP. 451-459

Keywords: 递进式隆升,力学模型,数值模拟,青藏高原

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Abstract:

根据青藏高原现代构造变形的GPS速度场、高原区喜马拉雅山等五大山脉之间的几何关系,及其在地貌构造上的褶皱结构特点、岩石圈的分层特征,提出在印度板块的推挤作用下,青藏高原具有递进式隆升特征的观点。在此基础上,建立了地壳层递进式弯曲隆升的力学模型,并利用FLAC有限差分法数值模拟软件,近似采用平面应变条件,模拟了在水平推力作用下,地壳层递进式挤压弯曲隆升的过程。根据所建立的力学模型和数值模拟结果认为,青藏高原隆升的主要动力源是印度板块北北东方向的推挤力,地壳层依照自南而北的次序逐步产生一系列弯曲隆起,从平面、剖面上均具有密切的时序因果关系;高原隆升与活动构造的发育、分布具有密切关系,断裂活动强度自南向北递进式扩展。

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