Oligocene Palynoflora,Paleovegetation and Paleoclimate in the Tanggula Mountains, Northern Tibet

详细信息   

• 责任者：Duan Qifa (College of Earth Sciences ; China University of Geosciences ; Wuhan 430074 ; China) ; Zhang Kexin
• 刊名：Acta Micropalaeontologica Sinica
• 出版年：2008
• 卷期：25(2)
• 关键词：渐新世 ; Oligocene ; 孢粉组合 ; palynological assemblage ; 唐古拉山 ; Tanggula Mountains
• 页码：p.185-195
• 图表：2 illus., 1 plate, 1 table, 28 refs.
• 分类号：1200
• issnNo：ISSN1000-0674
• isbnNo：CN32-1189/Q

摘要

The Cenozoic fluvial strata, exposed widely in the Tanggula Mountains, detaily recorded the information of the uplift of the northern Tibet Plateau and the paleoenvironmental evolution. The palynological analysis was carried out from the upper section of the Yaxicuo Formation during 1∶250 000 geological mapping in the Chibzhang Co area, Tanggula Mountains. Palynoflora was characterized by the predominant appearance of gymnospermous elements. The angiospermous pollen and pteridophyte spore increased in ascending order respectively. The amount of deciduous-broadleaf plants and pteridophyte plants increased from the early to middle Oligocene, which implies a paleoclimate change from the cool-humid southern temperate zone, northern subtropical semi-humid one to semidry southern temperate one.