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《Seismology and Geology》 1981-04
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THE TONGBAISHAN-DABIESHAN PAIRED METAMORPHIC ROCK BELT IN HENAN AND HUBEI PROVINCES

Zhang Zhaozhong, Zhang Bingliang, Feng Jinjian, and Li Songbin (Institute of Geology, National Bureau of Seismology)  
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, 9.049 A. 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, 9.032A 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.
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