Thermal evolution and its significance of I-A type granitoid complex

To reconstruct the cooling process of compound granites in different units (phases) with Laoshan Granitoid as an example, the relationships between formation, emplacement of I-A type granitoid and variation in tectonic environment and uplift of the orogenic belt are discussed from the viewpoint of thermal evolution. Now it has been pointed out that the cooling rates presented by the whole spectral series from I-type to A-type granites tend to be gradually faster and faster. Probably, it is a token of thermal evolution that the regional structural environment of the granites was converted from closed, compressive into open, tensile environment.