摘要
系统研究了桦甸盆地始新世植物孢粉的特征,并采用共存因子分析法定量重建该区始新世气候变化。通过详细鉴定和统计,桦甸盆地始新世桦甸组共鉴定出孢粉85属100种,以被子植物花粉占绝对优势,其中栎粉、椴粉、桤木粉和榆粉含量较高,裸子植物花粉和蕨类植物孢子含量较低,孢粉组合中热带-亚热带分子较多,但含量低于温带及亚热带,属北亚热带温暖湿润气候。通过共存分析获得的桦甸盆地始新世气候参数：年均温为13.6℃~18.4℃、最热月均温23.6℃~27.9℃、最冷月均温5.5℃~7.8℃、年降雨量887~1 206 mm、最湿月降雨量187~236 mm、最干月降雨量16~41mm、最温暖月降雨量45~143 mm。相比较于吉林东部珲春盆地始新世的孢粉植物群和古气候,差异不大,均属典型的温暖湿润的气候环境。
This paper systematically studies the Eocene palynological characteristics in Huadian Basin,and quantitatively reconstructs the Eocene climatic change,adopting method of the Coexistence Approach（ CA）. 85 genera and 100 species are identified in the Eocene Huadian Formation,which indicates that the palynoflora is characterized by the dominance of angiosperm pollen,and Quercoidites,Alnipollenites,Ulmipollenites and Tiliaepollenites are overwhelmingly predominant among the angiosperm pollen. The contents of gymnosperm pollen and fern spores are lower. The palynological assemblages show that the tropical-subtropical taxa are some abundant,while lower than temperate and subtropical taxa in contents,which indicates a northern subtropical warm and humid climate. The Eocene climate of Huadian Basin is quantitatively reconstructed by the Coexistence Approach,in whichthe MAT（ 13. 6 ~ 18. 4℃）,MWMT（ 23. 6℃ ~ 27. 9℃）,MCMT（ 5. 5℃ ~ 7. 8℃）,MAP（ 887 ~ 1 206 mm）,HMP（ 187 ~ 236 mm）,LMP（ 16 ~ 41 mm） and WMP（ 45 ~ 143 mm） are estimated. The comparison of palynofloras and palaeoclimates between the Huadian and Hunchun basins in eastern Jilin Province suggests that the Eocene climates of the two basins are very similar,i. e. both are warm and humid.
出处
《世界地质》
CAS
2016年第1期1-8,共8页
World Geology
基金
国家自然科学基金项目(41302075)
高等学校博士学科点专项科研基金(新教师类)项目(20110061120066)
中国博士后科学基金项目(2013M541291)联合资助
关键词
始新世
孢粉
古气候重建
共存因子分析
桦甸盆地
Eocene
pollen
quantitively reconstruction on palaoclimate
coexistence approach
Huadian Basin
