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Crustal Deformations of the Central North China Craton Constrained by Radial Anisotropy
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2020-05-20 , DOI: 10.1029/2019jb018374
Sanxi Ai 1, 2, 3 , Yong Zheng 1 , Sixue Wang 1
Affiliation  

Situated in a transition zone between the western and eastern North China Craton (NCC), the central NCC exhibits complex dynamics features. Significant lithosphere thinning is observed beneath the eastern NCC and the northern segment of the central NCC. To study how the crust responses to the distinct lateral variations of the lithospheric mantle, we develop a method for joint inversion of Rayleigh and Love dispersion curves based on a transverse‐isotropic (or radial anisotropy) medium and obtain a 3‐D crustal radial anisotropy model. The results reveal significant heterogeneities along the Cenozoic Fenhe‐Weihe Rift (FWR). In the northern FWR, the discretely distributed lower crust positive anisotropy and upper crust negative anisotropy suggest the rifting is mainly dominated by the active mantle upwelling resulting in the Datong volcanoes. Similarly, the northern segment of the Taihang Mountain is also strongly affected by the magmatic activities and exhibits different anisotropy properties compared to its central‐to‐southern counterpart. Based on the negative anisotropy observed in the middle‐to‐lower crust beneath most parts of the Taihang Mountain, we speculate that a lower‐crust compression model can be applied to the Taihang Mountain, which is totally different to that of the adjacent Bohai Bay Basin. Possibly, the root of the Taihang Mountain is pushed by the westward moving lower crust coupled with the lateral escaping mantle flow beneath the Bohai Bay Basin. The Taihang Mountain and the Bohai Bay Basin are formed in similar tectonic environments, but are deformed in different ways.

中文翻译:

受径向各向异性约束的华北中部克拉通地壳形变

中央NCC处于华北克拉通西部和东部之间的过渡带,具有复杂的动力学特征。在东部NCC和中部NCC的北部之下,岩石圈明显变薄。为了研究地壳对岩石圈地幔不同横向变化的响应,我们开发了一种基于横观各向同性(或径向各向异性)介质联合进行Rayleigh和Love色散曲线联合反演的方法,并获得了3D地壳径向各向异性模型。结果表明,新生代F河-渭河裂谷(FWR)沿线存在明显的异质性。在北部FWR,下地壳正各向异性和上地壳负各向异性是离散分布的,这表明裂谷作用主要由活跃的地幔上升流控制,从而形成了大同火山。同样,太行山北段也受到岩浆活动的强烈影响,与中南部相比,表现出不同的各向异性。根据太行山大部分地区中下地壳的负各向异性,我们推测太行山可以采用下地壳压缩模型,与相邻的渤海湾完全不同盆地。太行山的根部可能是由向西移动的下地壳以及渤海湾盆地下方的侧向逃逸地幔流推动的。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。太行山北段也受到岩浆活动的强烈影响,并且与中南部相比表现出不同的各向异性。根据太行山大部分地区中下地壳的负各向异性,我们推测太行山可以采用下地壳压缩模型,与相邻的渤海湾完全不同盆地。太行山的根部可能是由向西移动的下地壳以及渤海湾盆地下方的侧向逃逸地幔流推动的。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。太行山北段也受到岩浆活动的强烈影响,并且与中南部相比表现出不同的各向异性。根据太行山大部分地区中下地壳的负各向异性,我们推测太行山可以采用下地壳压缩模型,与相邻的渤海湾完全不同盆地。太行山的根部可能是由向西移动的下地壳以及渤海湾盆地下方的侧向逃逸地幔流推动的。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。根据太行山大部分地区中下地壳的负各向异性,我们推测太行山可以采用下地壳压缩模型,与相邻的渤海湾完全不同盆地。太行山的根部可能是由向西移动的下地壳以及渤海湾盆地下方的侧向逃逸地幔流推动的。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。根据太行山大部分地区中下地壳的负各向异性,我们推测太行山可以采用下地壳压缩模型,与相邻的渤海湾完全不同盆地。太行山的根部可能是由向西移动的下地壳以及渤海湾盆地下方的侧向逃逸地幔流推动的。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。太行山的根源由向西移动的下地壳和渤海湾盆地下方的侧向逃逸地幔流推动。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。太行山的根源由向西移动的下地壳和渤海湾盆地下方的侧向逃逸地幔流推动。太行山和渤海湾盆地形成于相似的构造环境中,但变形方式不同。
更新日期:2020-06-27
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