Paleogene-Neogene Pollen and Climate Change in Dahonggou Region of Qaidam Basin

doi:10.19657/j.geoscience.1000-8527.2020.027

Abstract

Abstract:

Pollen samples were obtained from the northern margin of Qaidam Basin, where Paleocene to Pliocene lacustrine-facies sequences are exposed. Fourteen palynological assemblages have been identified by pollen identification and analysis, which shed light on the vegetation and climate change history of the basin. The pollen analysis results have recognized the Eocene Climatic Optimum, and revealed a vegetation evolution of northern subtropical ever green broad leaf forest→warm, temperate deciduous broad-leaved coniferous forest→temperate mixed forest→coniferous forest→arid mountain desert. The paleoclimate can be inferred from the vegetation correlation with the global climate trends, which matches the global climatic events. Cold to warm and dry to humid fluctuations can also be distinguished on the basis of the palynofloras recovered from the basin. A cold and dry period during 11-9 Ma, different from the Middle Miocene Climatic Optimum (MMCO),may have been caused by tectonic movements in the Qaidam Basin.

Key words: Qaidam Basin, Paleocene, Pliocene, palynology, paleoclimate change

CLC Number:

LU Jingfang, ZHANG Kexin, SONG Bowen, XU Yadong, ZHANG Jianyu, HUANG Wei, ZHANG Daolai. Paleogene-Neogene Pollen and Climate Change in Dahonggou Region of Qaidam Basin[J]. Geoscience, 2020, 34(04): 732-744.

Figures/Tables 5

Fig.1 Regional geologic map of the Dahonggou region,Qaidam Basin(modified after reference[17])

Fig. 2 Stratigraphic column of the Dahonggou section in Qaidam Basin(ages from references [20-22])

Fig.3 Microscope photos of pollen morphology of the Dahonggou section

Fig.4 Pollen diagram of the Dahonggou section in Qaidam Basin, showing all pollen types

Fig.5 Vegetation, geochemical analysis and climate events of the Dahonggou section (tectonic event from reference [30], element chemical concentrations from references [35, 45] and global climate event from reference [28])

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