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A Discussion on the Collision Time
详细信息   
摘要

Based on the isotopic ages collected in some collision zones of China and Europe continents, the process from subduction to collision between plates is discussed; in this process the following events occurred in sequence: the decrease in the moving velocity of plates, the disappearance of the oceanic crust on the surface, the beginning of the collision, the formation of the strong deformation and dynamic metamorphism, the occurrence of a series of magmatism and, at last, the uplifting of mountains. Above events have extremely different isotopic ages. The initial collision age is younger than that of the oceanic crust disappearing on the surface, and older than that of the formation of strong deformation and dynamic metamorphism. Obviously, it is very difficult to determine the initial age of subduction by using the isotopic age of only one geological event.oft-com:office:office" />

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