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一、引言大别群、红安群、应山群是湖北省大别山—河南省桐柏山南麓广泛出露的前震旦纪地层(图1)。长期以来,一些地质前辈、院校和各地质单位对上述地层及变质岩学进行了大量工作,积累了较丰富的地质资料。但是,由于地层时代确定缺乏依据,各群之间的接触关系不清,致使地层划分和对比较混乱,在对该区的大地构造问题的认识上也存在着较大的分歧。
I. INTRODUCTION The Dabie Group, Hongan Group and Ying Shan Group are the pre-Sinian strata that have been widely exposed in the Dabie Mountains in Hubei Province - south of Tongbai Mountain in Henan Province (Figure 1). For a long time, a large number of geological predecessors, institutions and geological units carried out a great deal of work on these strata and metamorphic rocks and accumulated rich geological data. However, due to the lack of basis for the determination of the stratigraphic age and the unclear contact between the various groups, stratigraphic division and comparisons are quite chaotic. There are also big differences in the understanding of the geotectonic problems in the area.