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Discussion on the formation and evolutionary history of Shangyi-Longhua regional fault in northern Hebei Province |
MA Chao, WANG Jingui, ZHANG Xinquan, ZHANG Zixuan, LI Dian, ZHANG Xinzheng, XU Fan |
Regional Geology Survey Institute of Hebei Province, Langfang 065000, China |
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Abstract Shangyi-Longhua regional fault was EW distributed near northern Hebei Province, which was first active in the Late Neoarchean (Late Fuping) and still active in the Holocene and even today. Therefore, exploring its formation and evolutionary history is of great significance to study its geological structure, mineral distribution and the influence of Neotectonic movement on human beings in northern Hebei Province. The regional faults in Shangyi-Longhua are strong complex deformation zones through the census of the tectonic rocks and all kinds of directional structures in the fault zone. The ductile deformation and brittle deformation are alternating with characters of chronicity, multiphase activity, propensity and nature variation. Shangyi-Longhua regional fault is one of the important dividing lines of tectonic units of different levels in different periods in northern Hebei Province, which plays an important role in controlling the development and evolution of geological history on both sides. The authors redefined the structure superposition transformation relation and the development period, according to the superimposed relationship of the sturcture, the corresponding relationship between metamorphic degree of mylonites and the regional metamorphism, and the corresponding relationship between the movement model reflected by the shear-pointed fabric and the principal stress of the regional tectonic movement. Combined with the metamorphic mineral age of the predecessor tectonites, the authors divided the fault structure into two construction phases and nine tectonic active periods.
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Received: 02 February 2019
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