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《中国科学B辑(英文版)》 1995-11
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Tectonics and structure of Qinling orogenic belt

ZHANG Guowei MENG Qingren LAI Shaocong (Department of Geology,Northwest University,Xi'an 710069,China)  
The Qinling orogen has 2 kinds of orogenic basements.The main orogenic phase was characterized by the oblique subduction and collision of 3 plates at 2 suture zones.There are a number of vertical accretionary structures under the control of deep-seated thermo-tectonic processes.The present 3-D model of the.Qinling is a "flyover-like" framework.Deep geophysical field is featured by nearly south-north-trending anomalies,while the upper crust is dominated by east-west-trending structures.Between them are the middle and lower crusts which are in a rheologieal state of the horizontally flattening. Fundamental structures of the upper crust was built during the main orogenic phase,which contains residual structures and is intensively superposed by the late intracontinental tectonism.This tectonic model for the Qinling orogen is distinct from the existing ones in that it represents a complicated development of diverse tectonic regimes.This model cannot be either interpreted by an individual existing model.
【Fund】: the National Natural Science Foundation of China
【CateGory Index】: P542
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