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Formation of the Bikou fault block in the Longmen Mountains and restoration of its original spatial position

TANG Jun 1,2 ,ZHAO Peng-da 1 ,CHEN Jian-ping 1 ,LI Qing 1 ,JIN Xiu-ju 3 ,FENG Chun 1(1.High-tech Centre,China University of Geosciences,Beijing1000 83,China2.Jianghan Petroleum Institute,Jingzhou434102,Hubei,China 3.Zhongyuan Oilfield Corporation,Puyang45  
In light of the guiding through for the analysis of geologic a nomalies,this paper puts forward the concept of restoration of original spat ial positions of anomalous geologic bodies and studies the restora-tion of the original spatial positions of the Bikou fault block at the northern end of the Longmen Moun-tains.The trajectory of the motion of the Bikou fault blo ck is restored.It is believed that the spatial geo-logic anomalous body in th e area is the result of three-fold tectonic movements of the Qinghai-Tibet, South China block,and North China block.The different directions of their t ectonic movements resulted in their different effects exerted in different tim es and spatial positions.The authors divide the main process of motion of the Bikou fault block into four stages:(1)compressional faulting,(2)west- directed decollement ,(3)dextral shear,and(4)east-directed gravitationa l compression.This interprets the tectonic origin of the area.Therefore,in t he study of the geological problems in the area or other complex area,it is necessary to consider the main parts of several effects and their influences in different times and under-stand and analyze the origin of a geologic body in the context of dynamic evolu tion in time and space.Effects of different tectonic main parts in different times also give rise to the diversity of anom alous geo-logic bodies in spatial distribution.Therefore,this paper advances the concept of restoration of original spa-tial positions of anomalous g eologic bodies,which has great realistic significance for the understanding of the diversity of mineralization and study of hierarchy of mineralization.
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