Mesozoic Ultra-metamorphism and Mantle Plume in North China Platform
试论华北地台中生代超变质作用与地幔热柱作用

Based on the discussions of the Mesozoic gold mineralization, granites and alkaline rocks in the "Archaean "high grade metamorphic terrains of gold enriched aera, such as northwest Hebei, Jiaodong East Shandong, the paper proposes the Mesozoic ultra-metamorphism which includes migmatization, granitization and rheologic gneiss. It is considered to be one of the important causes of the anomalous geological phenomena of north China platform which are the deeper metamorphism of the "Archaean" high grade metamorphic terrains, the same geological body having different isotopic ages, intensive magmatic activity in Mesozoic Era. It is not only an important deep geological process of North China platform activation but also the concret embodiment of deep" de-rooting". Mesozoic mantle plume is the deep mechanism of the ultra-metamorphism, metamorphic core complexes, gold mineralization. It is basic reasons for the north China platform activation in Mesozoic Era.