摘要
The eastern part of Yangtze block is composed of two geological units, Dabie orogen and Lower Yangtze region. In this paper, four intrusions, Hongzhen, Yueshan and Taiping-Huangshan, from Lower Yangtze region are studied for understanding the crustal compositions and architectures in the area, and comparing with those of the Dabie orogen. Nd isotope is a powerful tool for crustal architecture studies. The results indicate that crustal compositions in Lower Yangtze region were accreted by multistages during the Neoarchean-Paleoproterozoic,early Mesoproterozoic and late Mesoproterozoic-Neoproterozoic, which are similar to the eras of the Dabie crustal accretion. However, the architectures between Lower Yangtze region and Dabie orogen are different. The most important difference is that the late Mesoproterozoic-Neoproterozoic juvenile crustal material in the Lower Yangtze region is underplated to the old crustal, but the crustal architecture in the Dabie orogen from the bottom to the top are assembled from old to young. In addition, the early Mesoproterozoic accretion crust may not exist in the area along Yangtze River.