大别山北麓佛子岭群的特征及其形成的大地构造环境

佛子岭群主要由一套绿片岩相的变质岩组成,分布在安徽境内的大别山北麓。其上部为一套变质的复理石建造,下部为变质的火山-沉积岩建造。佛子岭群的变质火山岩的岩石化学特征及佛子岭群的岩石组合特征表明,佛子岭群是发育在一断陷盆地中,该断陷盆地可能在晚元古代早期开始拉张,在晚元古代末期闭合。在此期间,郯-庐断裂带在华北断块和大别山古老断块之间的拉张与闭合过程中可能起着类似于转换断层的作用。

THE CHARACTERISTICS OF FOZILING GROUP AND THE GEOTECTONIC ENVIRONMENT OF ITS FORMATION IN THE NORTHERN FOOT OF THE DABIE MOUNTAIN

The Foziling Group consists mainly of green schist facies metamophic rocks which occur in the northern foot of the Dabie Mountain. The upper part of it is a suit of metamorphic flysch formation, and the lower part, metamorphic volcanic-sedimentary rocks. Petrochemical composition of the volcanic rocks and characteristics of the sedimentary structure show that they formed in the down fault-subsidence basin which was opened at the early period of Late Proterozoic era, and closed at the end of Late Proterozoic cra. It should be pointed out that the Tan-Lu Fault Zone may play an important role similar to transform fault in the process of opening and closing between the North China Fault Block and the Dabie Accreting Block.