The effective elastic thickness of the continental lithosphere: Comparison between rheological and inverse approaches
The effective elastic thickness of the continental lithosphere: Comparison between rheological and inverse approaches
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DOI：
10.1029/2012gc004162
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发表时间：
2012-09
期刊：
影响因子：
3.7
通讯作者：
M. Tesauro;P. Audet;M. Kaban;S. Cloetingh
中科院分区：
文献类型：
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作者：
M. Tesauro;P. Audet;M. Kaban;S. Cloetingh
随着不同方法得到的全球大陆有效弹性厚度(Te)图的发布，我们现在有机会对Te提供更好的约束。我们使用考虑了岩石圈杨氏模数变化的新方程，改进了以前从岩石圈强度(或Ter)的热流变模型得出的Te的估计。将这些新值与基于地形和重力异常之间的频谱相干性与等效弹性板对载荷的弯曲响应进行比较的逆方法(TEI)得到的值进行了定量比较。这两个模型总体上显示出良好的一致性，在大约一半的大陆地区具有相同的均值(在95%的显著水平上)。在其他地区，Tei在大约65%的数据点上超过Ter，表明Tei提供了Te的上界。这两个数据集具有相似的范围，但表现出不同的分布。TER呈双峰分布，两个峰代表克拉通及其以外地区。相反，Tei的分布更均匀，没有明显的峰。由于所采用的方法，我们的模型显示中新生代造山带的相似性高于太古宙和元古界的地盾和地台。对于Ter和Tei测定最稳健的地区，它们之间的关系接近于线性。这项工作的结果可用于进一步研究岩石圈的力学性质。
Following the release of global continental effective elastic thickness (Te) maps obtained using different approaches, we now have the opportunity to provide better constraints on Te. We improve previous estimates of Te derived from thermo‐rheological models of lithospheric strength (or Ter) using new equations that consider variations of the Young's Modulus in the lithosphere. These new values are quantitatively compared with those obtained from an inverse approach (or Tei) based on a comparison of the spectral coherence between topography and gravity anomalies with the flexural response of an equivalent elastic plate to loading. The two models show in general a good agreement, having equal means (at the 95% significance level) in about half of the continental areas. In other regions Tei exceeds Ter in about 65% of the data points, showing that Tei provides an upper bound on Te. The two data sets have a similar range, but demonstrate different distributions. Ter has a bimodal distribution, with the two peaks representative of the cratons and of the areas outside of them. In contrast, Tei has more uniform distribution without predominant peaks. Our models show higher similarities in the Meso‐Cenozoic orogens than in the Archaean and Proterozoic shields and platforms, due to the methods employed. For the regions with the most robust determinations of Ter and Tei, the relationship between them is close to linear. The results of this work can be used for further studies on the mechanical properties of the lithosphere.