The Quaternary Sedimentary Structure And The Lithofacies Palaeogeographic Evolution In The Taihu East Lake

The taihu lake,Located in the southeast of jiangsu province, Yangtze river deltahinterland,Is the largest lake in east China, the third largest freshwater lake of china,Taihu lake is located in the rivers and inside of the economically developed Yangtzeriver delta, it Is the center of the jiangnan butterfly depressions, the east of taihu lakebasin is a part of the mountain to the north east, High north east low terrain southwest,Main morphology is Low mountain, hills, monadnock and The plain, On the landscapeis given priority to with accumulation effect, The accumulation of thick quaternarysediments.For a long time Many scientific workers have done a lot of research in The climateof taihu lake evolution and geological environment, But the focus of researchConcentration of The holocene climate change,it has Less research about Pleistocene intaihu lake region, The author in view of this system to the whole region along theeastern coast of taihu lake watershed of lithofacies palaeogeographic evolution and asummary analysis, Viewed the development of taihu plain quaternary system isinfluenced by many factors, Sediment the restriction of the ancient landform, Thespatial distribution of lithofacies and sedimentary thickness is varied.Using quaternary deep drilling, surface drilling, all kinds of samples is relativelymature means such as test and analysis, Restore and recovery lithofaciespalaeogeography, The quaternary stratigraphic division in addition to outside thelithostratigraphic,biostratigraphic and other commonly used methods,Integratedapplication of climate formation paleomagnetic formation isotopic age(chronostratigraphy),use these methods to Comprehensive comparison. Through theabove a variety of technical means and comprehensive research, Think that the eastcoast of taihu lake region early pleistocene climate by warm and humid cool evolutionfor the moderate slightly cool dry, Changes in temperature alternating frequently, In theearly pleistocene climate began to thaw, abundant rainfall, Development of surfacerunoff, Vegetation recovery, lush plants, Formation of hot and humid environment, Intothe late Pleistocene, China universal warming climate, a rise in sea level, Formed awide coastal lagoon plain landscape, At the beginning of the late late pleistocene about60ka since after periods of cold climate, The geological history of the regional climatebecame warmer, the earth’s crust, sea level rise, formed another transgression in thestudy area, The weather gets warmer early holocene, the sea level rise, warm, humidplants spread to the holocene optimum climate period.