The Source Composition Inversion of the Late Mesozoic Granitoids in Lower Yangtze Region
详细信息
- 责任者：Wang Bin (Key Laboratory of Crust-Mantle Materials and Environments ; CAS ; School of Earth and Space Sciences ; University of Science and Technology of China ; Hefei 230026 ; China) ; Xie Zhi
- 刊名：Geological Journal of China Universities
- 出版年：2012
- 卷期：18(4)
- 关键词：花岗岩 ; granite ; 物源区 ; provenance ; 扬子地区 ; Yangtze Region
- 页码：p.623-638
- 图表：7 illus., 3 tables, 51 refs.
- 分类号：0801
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
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.