The Study On Change Of Paleoclimatic Envirioament Since Late Pleistocene In Cangzhou

This paper analyzes the CZ01hole grain size characteristics, color characteristics, and magnetic susceptibility, By describing the sediment lithology and use of particle size analysis, color analysis and magnetic susceptibility analysis. On the basis of compared with the results of previous studies, discussed the change of paleoclimatic environment since Late Pleistocene In Cangzhou. The main conclusions are as follows:1、OSL dating results shows that the CZ01hole sediments record deposition process since the late Middle Pleistocene.159.5m is the boundaries of the Middle Pleistocene and the Upper Pleistocene;26.6m is the boundaries of the Upper Pleistocene and Holocene, and80.6m is the boundaries of The last interglacial and the last glacial.2、The results of particle size analysis, color analysis and magnetic susceptibility analysis show that the CZ01hole sediments has gone through three full High-energy to Low-energy deposition process since the late Middle Pleistocene, and the changes of the sediment material sources is also very complex. Climatic characteristics experienced a transition from interglacial climate to glacial climate, and there is climate fluctuations in the glacial and interglacial.3、Described the changes of the CZ01hole sediment deposition rate since the late Middle Pleistocene by analyzing the sediment lithological characteristics and optical stimulated luminescence dating results, the deposition rate of Late Pleistocene and late Pleistocene is slow, the deposition rate of Late Pleistocene and Holocene is fast4、By combining the various parameters of granularity, chroma and magnetic susceptibility, and on the basis of compared with the results of previous studies, discussed the change of paleoclimatic environment since Late Pleistocene In Cangzhou. CZ01hole has gone through three complete cycles of deposition since Late Pleistocene, the first sedimentary cycle occurred in the late Middle Pleistocene (128ka-200ka), the depositional environment from the river into a lacustrine, climate characteristical is a glacial climate. There is two complete sedimentary cycle in the Late Pleistocene (12ka-128ka), the first one(80.6-159.5m) occurred in the last Interglacial(75-128kaB.P.), the depositional environment from the river into a lacustrine, climate characteristical is the Interglacial climate. The second one (26.6-80.6m) occurred in the last glacial12-75kaB.P.), the depositional environment from the river into a lacustrine, climate characteristical is the glacial climate. The depositional environment of the Holocene is the lacustrine, and has changed, Climate gradually warming.5、By analyzing the Sediment lithological characteristics and Particle size cumulative curve, speculated that the100-140m core、30-60m core and10-20m core are the marine sediments. the100-140m core, these are the last inter-glacial sediments、the last glacial sediments and the Post-glacial sediments.