试论华北地台中生代超变质作用与地幔热柱作用

Mesozoic Ultra-metamorphism and Mantle Plume in North China Platform

本文通过冀西北、胶东等金矿富集区“太古宙”高级变质地体中生代金矿化、变质核杂岩构造、花岗岩、碱性岩等问题的讨论，认为中生代强烈而广泛的混合岩化、花岗岩化、流变“片麻岩”化等超变质作用，是华北地台太古宙高级变质地体变质程度深、同一地质体同位素年龄数据相差悬殊、中生代强烈岩浆活动等异常地质现象的重要原因之一。它既是华北地台活化的重要深部地质作用，亦是深部“去根作用”的具体体现。而中生代地幔热柱作用又是用变质作用、变质核杂岩构造、金矿成矿作用的深部机制，也是华北地台中生代活化的根本原因所在。

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.