大别山超高压变质带内浅变质岩层再认识

Low-grade metamorphic rocks in the Dabie ultrahigh-pressure metamorphic belt:A new understanding

本文依据浅变质岩层所保存的韵律层理、沉积构造、火山角砾—凝灰结构及残存的微古植物组合等，以及硅酸盐、稀土、微量元素分析成果的判别，对浅变质岩层进行了再认识，认定该浅变质岩是一套经受浅变质作用改造的火山碎屑沉积岩层；并就建立其地层序列，区域地层对比进行了论述；对其存在意义和时代归属进行了讨论。

：The authors have got a new understanding on the basis of studies of the rhythmic stratification， sedimentary structures， volcanic brecciated－tuffaceous textures and remnant microfloras preserved in low－grade metamorphic rocks in the Dabie ultrahigh－pressure metamorphic belt， as well as silicate， rare earth element（REE）and rare element analyses．They hold the view that the low－grade metamorphic rocks in the belt are a sequence of pyroclastic－sedimentary rocks that have undergone low－grade metamorphism and a stratigraphic succession has been established． In the paper， regional stratigraphic correlation is made and the significance of the occurrence of this sequence of rocks and its age assignment are also discussed．