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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Spatial variations of flexure parameters over the Tibet-Quinghai plateau
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Spatial variations of flexure parameters over the Tibet-Quinghai plateau

机译：青藏高原挠曲参数的空间变化

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摘要

We investigate the Tibet-Quinghai plateau and the Tarim basin in terms of spatial variations of the elastic thickness (T_e) in the frame of the thin plate flexure model. The method of investigation makes use of a convolutive method, which allows high spatial resolution of the flexure properties and overcomes some of the problems tied to the spectral admittance/coherence methodologies. We study the relation between the topographic and subsurface loads and the observed crust-mantle interface (CMI) undulations, the latter having been obtained from gravity inversion. The gravity data used for the inversion are a unique set of high quality data available over the Chinese part of the plateau, and constitute the highest resolution grid today available in this impervious area. The gravity inversion is constrained by results from the study of the propagation of seismic waves. The two extensive sedimentary basins, the Tarim and the Qaidam basins, are modeled by forward gravity modeling. The oscillations of the CMI obtained from the gravity inversion agree well with those expected by loading the thin plate model of spatially variably elastic thickness with the surface and subsurface loads. It is found that the modeling of the sedimentary basins is essential in the flexure analysis. The spatial variations of elastic thickness correlate with the extensions of the different terrains that constitute the plateau. Most of the Tibet plateau has low T_e,varying in the bounds 10-30 km, with lower values in the Qiangtang terrain, where the T_e reaches 8 km. The Tarim and the Qaidam basins, Precambrian platforms overlain by sediments, are rigid and have a T_e of up to 110 km and 70 km, respecively. The flexural analysis distinctly discerns the Tibet plateau, with thick crust, part of which is molten, from the cratonic areas, the Tarim and Qaidam basins, which though of thinner crust, act as undeformable rigid blocks.
机译：我们根据薄板挠度模型框架中的弹性厚度（T_e）的空间变化研究了青藏高原和塔里木盆地。研究方法利用卷积方法，该方法允许挠曲特性的高空间分辨率，并克服了与光谱导纳/相干方法有关的一些问题。我们研究了地形和地下载荷与观测到的地幔幔界面（CMI）波动之间的关系，后者是通过重力反演获得的。用于反演的重力数据是在高原的中国部分可获得的一组独特的高质量数据，并且构成了该不可渗透区域中当今可用的最高分辨率的网格。重力反演受到地震波传播研究结果的限制。塔里木盆地和柴达木盆地这两个大的沉积盆地通过正向重力模型进行建模。通过重力反演获得的CMI的振荡与通过将表面和地下载荷在空间上变化的弹性厚度的薄板模型加载而预期的振荡非常吻合。发现沉积盆地的建模在弯曲分析中至关重要。弹性厚度的空间变化与构成高原的不同地形的延伸相关。西藏高原大部分地区的T_e较低，在10-30 km范围内变化，而在T_e达到8 km的Qian塘地区，T_e较低。塔里木盆地和柴达木盆地是前寒武纪平台，被沉积物覆盖，是刚性的，T_e分别高达110 km和70 km。挠曲分析清楚地看到了西藏高原，地壳厚，部分熔融，来自克拉通地区，塔里木盆地和柴达木盆地，尽管地壳较薄，但它们是不可变形的刚性块体。

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