"Impact Ejecta in Taihu Area" Revisted: Evidence from Ferruginous Concretions in Modern Sediments of Taihu Area
详细信息
- 责任者：Huang Zhicheng (State Key Laboratory for Mineral Deposits Research ; School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Liu Guanbang
- 刊名：Geological Journal of China Universities
- 出版年：2012
- 卷期：18(2)
- 页码：p.379-389
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
Regarding to the opinion of the impact origin of Taihu Lake based on the discovery of the iron-rich siderite ejecta and iron-poor ejecta, the authors restudied similar samples by way of mineralogy, geochemistry and chronology. The data show that those samples found in Taihu Lake are in fact siderite and limonite concretions which formed in Quaternary mud layer during diagenesis. Supporting evidence come from that a large number of aquatic plant debris, opal phytolith of plants, bacteria and a few animal shell fragments were found in those concretions The siderite 14C dating shows that the various samples formed at different times. The evidences showed that the weird-shaped concretions found in the Taihu Lake are diagenetic concretion, which are not impact ejecta.