THE BASEMENT PALEOSTRUCTURAL TYPE IN THE EASTERN QINLING RANGE-DABIE MOUNTAINS-JIAODONG REGION

In the paper the middle Proterozoic paleostructures in the Eastern Qinling Range-Dabie Mountains-Jiaodong region are discussed from the view-point of mobilism:（1）the Eastern Qinling-Tongbai are（long.110°30′—115°E and lat. 31°30′—34°N）,（2）the Dabie arc（long.115°—117°E and lat.30°10′— 31°30′N）,（3）the Sulu（Jiangsu-Shandong）arc（long.118°—124°E and lat. 33°30′—38°N）,and（4）the Huoqiu-Boxian longitudinal structural belt（long. 115°40′—116°10′E and lat.32°10′—34°30′N）. The Eastern Qinling Range-Dahie Mountains-Jiaodong region was an ancient basement arcuate structure——the Dabie-Sulu arc in the middle Proterozoic. In the Huobo area there is a longitudinal basement structure,which was sub- ducted towards the inner side of the Dabie-Sulu arc（but not reaching there）. If there should be any genetic connection,that would refer to the middle Proterozoic basement epsilon-type structure——the Proterozoic Huaiying epsilon type.The present-day Dabie-Sulu arc is exposed respectively on either side of the Tancheng-Lujiang fracture,with the two exposed parts being far apart. This is the result of sinistral disruption of the are by the Tancheng-Lujiang fracture.The reconstruction of this basement paleostructure may support the reconstruction of the late Proterozoic Kuhuai and Jiaoliao sedimentary basin, and vice versa. The reconstruction of the paleostructural type in the Eastern Qinling Range- Dabie Mountains-Jiaodong region has provided a new clue for the study of the structual types （including paleostructures）,stratigraphic correlation and region alscale mineral prospecting in eastern China as well as on both sides of the Tancheng-Lujiang fracture.