Palynomorphs in the first paleosol layer in the Yangtze Delta and their paleoenvi-ronmental implication

作     者：WU Guoxuan QIN Jungan DENG Bing LI Congxian 

作者机构：Key Laboratory of Marine GeologyMinistry of EducationTongji UniversityShanghai 200092China 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：2002年第47卷第21期

页      面：1837-1841页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 49999560 and 49976016) and the State Key Basic Research and Development Program (Grant No. 2000078505) 

主　　题：Yangtze Delta paleosol layer sporopollen phytoplankton paleoenvironment. 

摘      要：The relatively abundant palynomorphs were recovered from the samples of the first paleosol layer of core CY in Shanghai for the first time. A total of 55 genera and families of spore, pollen and phytoplankton were identified. According to the characteristics of the palynological assemblages, the depositional conditions in the development period of the paleosols were discussed and the microfossil evidence to study the origin of the paleosols in the Yangtze Delta area was provided as well. The research results show that paleosols should be freshwater deposits. The palynological assemblage sequence in the first paleosol layer reveals fluctuations of freshwater palynomorphs, mainly Concentricystis, and terricolous herbs pollen, reflecting the alternations of deposition and exposure in the development period of the paleosols. Concentricystis developed prosperously in the period of flood, while terricolous herbs grew on the emerged land in the period of exposure. The variations in the palynological