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首页> 外文期刊>Canadian journal of earth sciences >Dynamic cause of marginal lithospheric thinning and implications for craton destruction: a comparison of the North China, Superior, and Yilgarn cratons1
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Dynamic cause of marginal lithospheric thinning and implications for craton destruction: a comparison of the North China, Superior, and Yilgarn cratons1

机译：岩石圈边缘变薄的动力成因及其对克拉通破坏的影响：华北克拉通和宜尔冈克拉通的比较1

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摘要

We present a comparative tectonic analysis of the North China Craton (NCC), which has lost parts of its root, with the Yilgarn and Superior cratons, which preserve their roots. We compare the geophysical structure and tectonic histories of these cratons to search for reasons why some cratons lose their roots, while others retain them. Based on the comparison and analysis of geological, geophysical, and geochemical data, it is clear that the lithospheric thinning beneath craton margins is a common phenomenon, which may be caused by convergence between plates. However, craton destruction is not always accompanied by lithospheric thinning, except for cratons that suffered subduction and collision from multiple sides. The Western Block (also known as the Ordos Block) of the NCC, Yilgarn and Superior cratons have not experienced craton destruction; the common ground among them is that they are surrounded by weak zones (e.g., mobile belts or orogens) that sheltered the cratons from deformation, which contributes greatly to the long-term stability of the craton. Subduction polarity controlled the water released by the subducting plate, and if subducting plates dip underneath the craton, they release water that hydroweakens the overlying mantle, and makes it easy for delamination or sub-continental lithospheric mantle erosion to take place in the interior of the craton. Thus, subduction polarity during convergence events is an important element in determing whether a craton retains or loses its root.
机译：我们对华北克拉通（NCC）的构造构造进行了比较分析，该华北克拉通已经失去了部分根，Yilgarn和优越克拉通则保留了其根源。我们比较了这些克拉通的地球物理结构和构造历史，以寻找某些克拉通失去根而其他克拉通保留根的原因。通过对地质，地球物理和地球化学数据的比较和分析，可以清楚地看到克拉通边缘下方的岩石圈变薄是一种常见现象，这可能是由于板块之间的汇聚引起的。但是，克拉通破坏并不总是伴随着岩石圈变薄，除非克拉通遭受了多面俯冲和碰撞。 NCC的西部地块（也称为鄂尔多斯地块），Yilgarn和上等克拉通尚未遭受克拉通破坏;它们之间的共同点是它们周围的薄弱区域（例如活动带或造山带）包围了克拉通，使其免受变形影响，这极大地有助于克拉通的长期稳定性。俯冲的极性控制着俯冲板释放的水，如果俯冲板浸入克拉通下方，它们会释放水，从而使上覆地幔水弱化，并容易在层状内部发生分层或次大陆岩石圈地幔侵蚀。克拉通。因此，收敛事件期间的俯冲极性是确定克拉通是保留还是失去根的重要元素。

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