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Meso‐Cenozoic rheological structure of the Linqing Depression: Implications for cratonic destruction
Geological Journal ( IF 1.8 ) Pub Date : 2020-09-23 , DOI: 10.1002/gj.4008
Wei Xu 1 , Yi Li 1 , Luyao Cheng 1
Affiliation  

The evolution of the lithospheric rheological structure can reveal geodynamic processes of cratonic destruction. Using data of palaeo‐heat flow, crustal structure, and rheological parameters, we studied the rheological structure of the Linqing Depression. The results show that the lithosphere of the Linqing Depression experienced two stages of weakening, one in the Cretaceous and the other in the Palaeogene, with lithospheric strengths of approximately 2.09 and 1.67 × 1012 N/m and effective elastic thicknesses (Te) of approximately 24 and 20 km, respectively. The Meso‐Cenozoic rheological structures correspond to the ‘jelly sandwich’, ‘crème brûlée’, and ‘banana split’ models. The transformation of these models is closely related to the thermal regime, stress environment, and mantle water content of the Linqing Depression. The rheological structure evolution of the Linqing Depression is correlated with the cratonic destruction of the North China Craton. The geodynamic mechanism of lithospheric weakening in the late Early Cretaceous is related to the subduction and retreat of the Pacific Plate, and the lithospheric weakening in the late Early Palaeogene was a combined effect of the Indo‐Asian collision and subductions of the Pacific and Philippine Sea plates.

中文翻译:

临清pression陷中新生代流变结构:对克拉通破坏的启示

岩石圈流变结构的演变可以揭示克拉通破坏的地球动力学过程。利用古热流,地壳结构和流变参数的数据,我们研究了临清pression陷的流变结构。结果表明,临清De陷岩石圈经历了两个弱化阶段,一个在白垩纪,另一个在古近纪,其岩石圈强度约为2.09和1.67×10 12  N / m,有效弹性厚度(T e)分别约24公里和20公里。中新生代的流变结构对应于“果冻三明治”,“焦糖布丁”和“香蕉分裂”模型。这些模型的转换与临清De陷的热力状态,应力环境和地幔含水量密切相关。临清De陷的流变结构演化与华北克拉通的克拉通破坏有关。白垩纪晚期岩石圈减弱的地球动力学机制与太平洋板块俯冲和退缩有关,古近纪晚期岩石圈减弱的作用是印度-亚洲碰撞和太平洋与菲律宾俯冲作用的综合作用。板。
更新日期:2020-09-23
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