Abstract:

The insitu remelting theory of granite opens a new perspective for the study of the tectonic cause of the spatial and temporal distribution of the Late Mesozoic (Late JurassicEarly Cretaceous) granite in South China. By comparison, we found that there is a high degree of similarity and consistency in the spatial and temporal distribution of granite and the stress field in the Late Mesozoic between the DabieSulu orogenic belt and its north vicinity (especially the Sulu orogenic belt and its north vicinity) and South China. That is, the granite distribution is mainly along the NE direction, turns from old to new from NW to SE, and is under the control of the same stress field caused by the highspeed subduction of the paleoPacific plate towards the Eurasia continent. On the basis of this theory, we may conclude that the Late Mesozoic (Late JurassicEarly Cretaceous) granite of the DabieSulu orogenic belt and its north vicinity and the Late Mesozoic (Late JurassicEarly Cretaceous) granite of South China were very likely formed by the same event, that is, the subduction of the paleoPacific plate towards the Eurasia continent. The linkage effects between the plates caused by the subduction of the paleoPacific plate led to the friction between the South China plate and the North China plate, and as a result, the temperature of the crust increased and the granite magma layer formed. With the change of subduction speed, the position of the granite remelting interface moved and thus brought about the tendency that the Late Mesozoic granite became newer from NW to SE (at least the Sulu orogenic belt seems to be like this).

Key words: DabieSulu orogenic belt, South China, insitu remelting theory