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Meso-Cenozoic Stress Fields and Their Transition Mechanisms in the Eastern Taihang Mountain Fault Zone

AN Huiting;XU Liqing;LI Sanzhong;YU Shan;LIU Xin;SUO Yanhui;CAO Xianzhi;ZHAO Shujuan;WANG Pengcheng;GUO Lingli;DAI Liming;MOE Key Lab of Submarine Geosciences and Exploration Techniques, College of Marine Geosciences, Ocean University of China;  
Two important subparallel faults, namely the Large Taihang Mountain Fault and the Eastern Taihang Mountain Fault, are major faults developed in the Taihang Mountain region. To revel the differences and the transition mechanisms of Meso-Cenozoic stress fields, we studied the stress fields along the Eastern Taihang Mountain Fault Zone through combined statistics and field-based structural observations. Our results show that there are five stages of local stress fields in the area since ever Mesozoic. The directions of maximum principal stresses of the five stages are NW-directed, NE-directed, NWW-directed, NNE-NNW(near-SN)-directed, and NEE-directed, respectively. The five-stage stress fields correspond to NW-SE-directed compression in the Jurassic-Early Cretaceous-Yanshanian, NE-SW-directed compression in the Paleocene-Eocene, NWW-SEE-directed compression in the Eocene-Oligocene, near S-N-directed compression in the Pliocene-early Pleistocene, and NEE-directed compression since the middle Pleistocene, respectively. The regional dynamic correlations show that the early-stage compression may have resulted from the destruction of the North China Craton that caused by the westward subduction of the Pacific Plate to the East Asian Andean-type continental margin, and the middle-stage extension is possibly related to a direction change of subduction of the Pacific Plate, whereas the late-stage extension may have resulted from the eastward upwelling of the asthenosphere that caused by the collision of the Indian to the Eurasian plates and the eastward rollback of the Pacific subduction zone.
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