An Out-of-Syncline Thrust Model for the “Chengde Thrust Sheet” in Central Intraplate Yanshan Orogenic Belt, Northern North China Craton
详细信息   
摘要

    

///The complicated and enigmatic Jurassic folds and thrusts around Chengde Basin in central intraplate Yanshan Orogenic Belt were previously interpreted as a synclinal deformed thrust sheet with large-displacement (~>40-45 km) formed after Late Jurassic Tuchengzi Formation. This model has been challenged by many new findings in paleogeographic and provenance analysis of Tuchengzi Formation and Proterozoic Changcheng System, together with the research result in tectonic deformations. Meanwhile no new model has been proposed so far to account reasonably for the structural style and tectonic framework as well as the evolution process of this structurally complicated region. The research implies that there is no large-scale thin-skinned thrust tectonics in intraplate Yanshan Orogenic Belt as those in foreland fold and thrust belt of collision orogenic belt. Fold-accommodation fault is supposed to be treated as an important alternative model in dealing with the relationship between large-scale folds and thrust faults as well as tectonic framework and evolution in contraction regime.

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