江西省吉泰盆地梅2井白垩纪孢粉化石记录及古环境特征OA

To determine the stratigraphic age and reconstruct the paleoenvironmental conditions of the 420～800 m interval of well M2 in the Gaopi-Meigang uplift area(southeastern Jitai basin),this study carried out a systematic palynological analysis.The results identify a palynological assemblage comprising Schizaeoisporites-Taxodiaceaepollenites-Classopollis-Exesipollenites.The age indicated by this assemblage ranges from the Albian(late Early Cretaceous)to the Cenomanian(early Late Cretaceous),corresponding to the Zhoutian Formation.Analysis of the types and relative abundances of palynological fossils indicates that the climate at that time was mainly tropical-subtropical and arid.However,transient humid phases or stable surface water recharge occurred frequently,leading to the development of wetland in low-lying parts of the basin.The vegetation was dominated by coniferous woody and herbaceous communities,with sporadic deciduous or evergreen broad-leaved trees and shrubs.