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《Geological Science and Technology Information》 2010-04
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Geological Significances of Late Pliocene-Early Pleistocene Palynological Assemblage in Zanda Basin,Tibet

JIANG Shang-song~a,b,XIANG Shu-yuan~c,XU Ya-dong~a,b(a.Gradute School;b.Key Laboratory of Biological and Environmental Geology of Ministry ofEducation;c.Faulty of Earth Sciences,China University of Geosciences,Wuhan 430074,China)  
The Zanda Basin is a northwest-southeast extensional basin distributed in Nagri area,southwest of Tibet,formed in Late Miocene,about 9.6 Ma.It contains a well preserved series of lacustrine,fluvial and alluvial sediments.A study is made of one section in the basin located 1 km northwest of Xiangzi Village,Zanda County.Based on the previous ESR and paleomagnetostratigraphic research,the age interval of the Xiangzi Formation is dated most reasonably between 2.6 Ma B.P.and 1.67 Ma B.P..Through abundant palynological analyses,3 palynological zones and 8 palynological assemblages and vegetable types are recognized,and 3 phases of paleoclimatic changes are revealed:(1) 2.75-2.60 Ma,correlated with palynological zoneⅠand assemblage 1-2,when it was warm and damp-humid with coniferous-leaved and broad-leaved mixed forests,but the climate changed to dump-dry after 2.67 Ma.(2) 2.54-2.16 Ma,correlated with palynological zone Ⅱand assemblage 3-5,when it turned to cool and humid deciduous coniferous-leaved and broad-leaved mixed forests,and gradually changed to cold deciduous coniferous-leaved forests,indicated by the increase in the cold-tolerant tree taxa.(3) 2.13-1.86 Ma,correlated with palynological zone Ⅲ and assemblage 6-8,the increase of cold-tolerant bush taxa and drought-tolerant herb taxa suggested the climate change into cold and arid,while coniferous-leaved and broad-leaved mixed forests survived at the low altitude.
【Fund】: 中国地质调查局国家青藏专项(1212010610103);; 国家自然科学基金项目(40621002;40830212)
【CateGory Index】: Q913
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