Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Neogene sporopollen assemblages and paleogeographyin the Gyirong basin,Tibet

SUN Li-ming1,YAN Tong-sheng 2,TANG Gui-ying1,DING Xiao-yan3,WANG Rui-jun3,TIAN Li-fu1(1.Shijiazhuang University of Economics,Shijiazhuang 050031,Hebei,China;2.School of Resources and Environment,Hebei Normal University,Shijiazhuang 050016,Hebei,China;3.Hebei Institute of Geographical Sciences,Shijiazhuang 050011,Hebei,China)  
The sporopollen assemblages discovered in the Woma Formation in the Gyirong basin,Tibet,provide evidence for continuous and stable uplift of the Qinghai-Tibet Plateau during the Pliocene.Six assemblage zones may be distinguished in the Woma Formation in the Gyirong basin.The paleovegetation of the Woma Formation is characterized by subtropical,mountainous,needleleaf and broadleaf forest with Pinus and Abies as the constructive species,reflecting a warm-moist paleoclimatic environment.During the period,there occurred several pronounced climatic cold-warm fluctuations.Analysis of the lithofacies and paleogeography of the Woma Formation indicates that the depositional environment of the Woma Formation was mainly the fluvial and lacustrine one and locally the alluvial fan and swampy one.The evolution of the paleogeographic environment of the Woma Formation progressed through three stages,namely,the early formation stage,semi-open lake basin stage and enclosed lake basin stage.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved