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江苏东北部晚太古代东海群,分布于郯庐断裂以东至海域,邵店—桑墟断裂北西侧,北延山东境内。基岩断续见于赣榆县、东海县、新沂县和宿迁县及海域中的秦山岛及平岛等地。以东海县出露最多,赣榆县次之,一般在残丘及冲沟内零星出露,或为人工采石坑所揭。东海群是苏北变质岩系最古老的地层,由一套经历中深变质及不同程度的混合岩化的片麻岩—混合岩组成。间夹数量不等的浅粒岩、变粒岩、片岩、石英岩、大理岩及斜长角闪岩类。总厚约13000余米。本文主要讨论东海群变质岩系的变质建造和原岩建造,不妥之处,请批评指正。东海群是混合岩一片麻岩变质建造。根据
The late Archean Donghai Group in northeastern Jiangsu is located in the sea east of Tanlu Fault and in the northwest of Shao Dian-Sang-Hui fault in the north of Shandong Province. Broken bedrock found in Ganyu County, Donghai County, Xinyi County and Suqian County and the sea of Qinshan Island and Island and other places. Donghai County was the most exposed, followed by Ganyu County, generally in the residual hillock and gully sporadic out, or exposed by artificial quarry. The Donghai Group is the oldest strata of the northern Jiangsu metamorphic series and consists of a set of gneiss-mixed rocks that have undergone mid-deep metamorphism and varying degrees of mixed lithification. Between the number of folders ranging from shallow-grained, granulite, schist, quartzite, marble and amphibolite amphibolite. Total thickness of about 13,000 meters. This article mainly discusses the metamorphism and metamorphic construction of the metamorphic rocks in the Donghai Group. Donghai Group is a metamorphic rock-gneiss formation. according to