Strata Location of the Lanbaoping Formation of the Proterozoic E’bian Group in the Western Yangtze Block and Its Chronological Evidence of Zircon SHRIMP U-Pb Age
详细信息
- 责任者：Xiong Guoqing (Chengdu Institute of Geology and Mineral Resource ; China Geological Survey ; Chengdu 610081 ; China) ; Jiang Xinsheng
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(4)
- 关键词：元古宙 ; Proterozoic ; 地层划分 ; stratigraphic classification ; 扬子地台 ; Yangtze Platform
- 页码：p.350-360
- 图表：illus., 2 tables, 21 refs.
- 分类号：1200
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The stratigraphic sequence of E’bian Group in Western Yangtze Block is a debatable topic and its age has not yet been constrained by geological chronology for a long time.So,in this paper through the composite analysis of lithological characteristics,sedimentary sequences and their contact relations with its formation or intervals of the Proterozoic E’bian Group in the Western Yangtze Block,the strata location of the Lanbaoping Formation in E’bian Group was determined preliminarily.It should be put in the upper original E’bian Group,representing a new beginning of tectonic cycle and it is not a part of the E’bian Group.The obtained,for the first time,zircon SHRIMP U-Pb age of about(779.3±15.7) Ma from the Lower Lanbaoping Formation volcanic tuff proved it to be the Neoproterozoic,not the mid-Proterozoic.Two single-particle zircon SHRIMP U-Pb ages of about(2737±30) Ma and(2480±29) Ma demonstrate that an old Neoarchean crystallized base may have existed in E’bian-Jinkouhe District in the Western Yangtze Block.These results will contribute to the further research on the E’bian Group in the Western Yangtze Block.
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