Abstract: The features of paired metamorphic belts in the east region of Dabie Mountains have been briefly discussed in this paper.By mineralogical research and chemical-thermal calculation we have determined a paired metamorphic belts in the North Huaiyang region.In the high pressure-low temperature metamorphic zone a lot of index minerals and intergrowth of the index minerals have been discovered. In the typical segment, the ancient thermograde is 11 - 13℃/km. On the contrary, in the high temperature-low pressure metamorphic zone, there is a centre thermal-axis composed of migmatite, granite, and the intergrowth of the index minerals. In the centre thermal-axis the ancient thermograde is 45℃/km.The determination of the paired metamorphic belts in North Huaiyang makes the geotectonic attribution in this region definite, and the evolution of the paleotectonics in. North Huaiyang has been discussed.

Key words: Dabie mountains. Paired metamorphic belt, Subduction, Collision

摘要： 本文采用变质作用和叠加变质作用分析方法在大别山东段建立了高压低温变质带和与之对应的高温低压变质带。高压低温变质带和高温低压变质带具有典型的古地热梯度、标型矿物及其组合;后者还广泛发育混合岩化和花岗岩化,在大别山中部地区构成一条典型的热轴。双变质带是北淮阳深蚀的地缝合带重要组成部分,是划分古板块边界重要依据之一。它的发现进一步明确了该区古构造环境和演化。

关键词: 大别山, 双变质带, 俯冲, 碰撞