Palaeoecological Analysis of Paleogene Shahejie Formation in North Central Raoyang Sag of Central Hebei Depression
详细信息
- 责任者：Xi Zhugang (School of Geosciences ; China University of Petroleum ; Qingdao 266555 ; China) ; Guo Jingxing
- 刊名：Journal of Earth Sciences and Environment
- 出版年：2011
- 卷期：33(4)
- 关键词：古生态学 ; paleoecology ; 古气候 ; paleoclimate ; 孢粉组合 ; palynological assemblage ; 冀中坳陷 ; Jizhong Depression
- 页码：p.358-363
- 图表：1 illus., 2 tables, 13 refs.
- 分类号：1102
- issnNo：ISSN1672-6561
- isbnNo：CN61-1423/P
摘要
According to the identification of sporopollen fossils from the 42 wells in north central Raoyang Sag, Central Hebei Depression, the palaeoecological classification of palynoflora in Shahejie Formation was discussed; one palynological assemblage with high proportion of Quercoidites-Ulmipollenites was recognized, and five sub-assemblages were established. The results showed that the proportion of mesic sporopollen was stable ,with an average of 70% or higher, while there was a little change for the proportion of xerophilous and hygrophilous sporopollen; vegetation pattern during the late member 4 of Shahejie Formation was mainly evergreen and deciduous broad-leaved forest in semi-arid warm temperate climate; vegetation pattern during the member 3 of Shahejie Formation was mainly coniferous forest, and secondly broad-leaved forest in sub-humid sub-tropical climate; vegetation pattern during the member 2 of Shahejie Formation was mainly coniferous and broad-leaf forest in semi-arid sub-tropical climate; vegetation pattern during the member 1 of Shahejie Formation was mainly coniferous and broad-leaf forest with an increase of hygrophilous herbaceous vegetation in humid sub-tropical climate.