苏北元古界海州群变质作用

苏北东海—连云港一带的前震旦变质地层,据近年来的研究重新定为上太古界东海群和元古界海州群。本文主要是对海州群的变质作用进行讨论。

The Metamorphism of Proterozoic Haizhou Group, Northern Jiangsu

The Proterozoic Haizhou group can be divided into low Proterozoic Jinping and middle-upper Proterozoic Yuntai subgroups, The Jinping subgroup belongs to the metamorphic apatitolite-schist formation and the non-metamorphic apa- tite-bearing dolomitic carbonate-argillo-arenaceous sedimentary and the Yuntai subgroup-metamorphic leptynite formation and nonmetamorphic interme- diate acidic volcanic-elastic formation, The metamorphic formations can be divided into high greenschist facies consiting of albite-amphibole zone and low gzeenschist facies including the albite-actinolite zone, Having study of the metamorphic minerals and their deformations the authors suggest that the Haizhou group be- longs to the high-pressure metamorphic series of regional dynamometamorphism.