Abstract: According to the metamorphic grades, mineral paragenesis, index minerals and the b₀ values of phengites, the metamorphic rocks formed in Dabie Mountains may be divided, from south to north, into three metamorphic belts having different pressure types, Ⅰ, Ⅱ and Ⅲ. The blet I is situated mainly on the southern edge of the Da-bieshan and has the index minerals such as piedontite, stilpnomelane, glaucophane, chlo-ritoid and types 2M-and 3T-phengites. The mean b0 value of muscovites, 9.049Å. and the accumulative frequency curve, are close to that in Sanbagawa metamorphic belt, Japan. The geothermal gradient appeared in the subduction zones is 11℃/km with pressure of 4-7kb, belonging to a high-pressure type of metamorphic facies series. Belt Ⅱ runs on the northern edge of the belt Ⅰ and has the index minerals such as kyanite, sillimanite and cordierite. The mean b0 value of muscovite, 9.032Å and the accumulative frequency curve are close to that in the Otago belt. The belt Ⅱ belongs to the metamorphic facies of medum-high pressure type. Belt Ⅲ is situated on the northern edge of belt Ⅱ. Here, the index minerals are andalusite, cordierite and sillimanite belonging to the metamorphic facies of high-temperature and low-pressure type.The two suite of ophiolites distributed in eastwestern direction can be found in the belt Ⅰ and Ⅱ on both southern and northern edges of Dabieshan respectively. They are closely accompanied with the metamorphosed volcanic rocks, pelites and silicolites etc.Technically the rock bodies are emplaced by the wall rocks, occationally with the pseudosequence. In the Shueixianqiao area (belt Ⅱ) the basic volcanic rocks from these bodies are oceanic tholeiite. On the northern Dabieshan discovered for the first time melanges.Probably, "Qinling earth's axis" and "Huaiyang shield" don't exist, but the folding zones in Paleozoic era. In essential, the above-stated three metamorphic belts of different pressure types can be ascribed to the two paried metamorphic belts with different ages. The older one (Early Paleozoic) perhaps consists of belts Ⅱ and Ⅲ and the younger one (Late Paleozoic) of belt Ⅰ (a high-pressure metamorphic belt) devoid of a low-pressure one.In the early Paleozoic on the northern edge of Qinling-Dabie Mountains being in present position and on the southern margin of "North China ancient island chain" appeared a deep-sea trench in the EW direction. It is possible that the Dabieshan was formed in tne course of underthrusting. In the Late Paleozoic the "South China ancient island arcs" and the "North China ancient island chains" collided and united together.

摘要： 本文根据变质程度、标型矿物组合特征及多硅白云母b₀值等,将研究区的变质岩系从南向北分为三个不同压力类型的变质带:Ⅰ带(高压带)、Ⅱ带(中高压带)、Ⅲ带(低压带)。这三个不同压力类型的变质带很可能是两对时代不同的双变质带。在Ⅰ、Ⅱ带内均出露有蛇绿岩系和混杂堆积,其中之基性火山岩属深海拉斑玄武岩,它们很可能形成于大洋脊,侵位堆积于消减带。