Evolution Of Subei Basin 38-19ka Bp During Ancient Climate And Environment Records Research

Closely linking the largest ocean and the biggest continent,and under the control of the East Asian monsoon system, the North Jiangsu Basin is a most sensitive and an ideal region for global change research. The special geographic location makes the sediments from Zhoufen section record the process of climatic variation sensitively. This paper selects Zhoufen section located in the central part of Lixiahe plain as the object of study. Based on the precise chronology through the conventional 14C dating techniques and climate stratigraphy dating methods, via Zhoufen section of collected from the samples for five meters deep, we have constructed the palaeoenvironmental change processes between the past 38ka and 19ka of northern Jiangsu basin by multi-proxy analysis, such as granularity, magnetic susceptibility,geochemical elements and chroma, etc. The following is a brief conclusion of the study.The multi-proxy records from the Zhoufen section suggest five stages of climate changes:38-35.4ka BR, climate starts to cool and dry,35.4-32. lka BP relatively warm and clouding period,32.1-27.5ka BP relatively cool and dry period,27.5-23.8ka BP, humid and arid period alternate frequently, still giving priority to cool and dry, 23.8-19ka BP, climate warming stage。Through Zhoufen section with neighboring areas of existing research Gangxi profile contrast, we find that multi-proxy analysis record is very similar to the change trend since late phase MIS-3a, which is more obvious than Gangxi section climate change, further the arid-humid fluctuations since around MIS-3a diaclosed by Zhoufen section reveals a strong correlation with the Mangshan loess in Central China, Nanjing Hulu cave of stalagmite and NGRIP ice core record. The results not only has great comparability with the Mangshan loess in Central China, but also has strong accordance with the Nanjing Hulu cave of stalagmite and NGRIP ice core record. This indicates that the climate change in Eastern China not only has great regional character, but also has great correlation with the global climate change.