Mesozoic-Cenozoic Structural Deformation and Tectonic Stress Fields in the Ceyu Area of the Middle-Southern Taihang Mountains
The Ceyu area in the middle-southern Taihang Mountains in the Mesozoic-Cenozoic experienced intense structural deformation,with the main structural features being faults.In this paper,we present new structural data related to the conjugate shear joints and faults in the Ceyu area to define the tectonic stress fields in the Mesozoic-Cenozoic.This research conducted an analysis of the conjugate shear joint and fault slip vector data,based on detailed field structural observations.Structural analysis shows that the Mesozoic-Cenozoic tectonic stress fields in the Ceyu area had undergone three stages of evolution:the late Jurassic NW-SE compression,the early Cretaceous NW-SE extension,and the Paleocene-Eocene NE-SW compression.According to the characteristics of regional tectonic evolution,it is speculated that the NW-SE compression stress field might be related to the NW-ward subduction of the Paleo-Pacific Plate by the late Jurassic to the eastern margin of the Asian continent;the NW-SE extension stress field was related to the early Cretaceous arc-back extension of the East Asian active continental margin,which occurred during the destruction stage of the North China Craton;and the NE-SW compression stress field was related to the retrograde rotation of the subduction direction of the Paleo-Pacific Plate from NNW to NWW during the Paleocene-Eocene.The three stages of tectonic stress fields in the Ceyu area recorded information about Mesozoic-Cenozoic tectonic evolution and dynamic background in the middle-southern sections of the Taihang Mountains.
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