关键词: 古环境分析, 古气候, 磁化率, 同位素年龄测定, 黄土

Abstract: The Linfen basin is situated in the middle part of Shanxi Province,where loess.is widespreadly,successively deposited and forms a complete stratum.Therefore,it is one of comparative ideal area for study of paleoclimate change.The loess in Linfen basin,chrono-logically can be divided into Upper Pleistocene Malan loess,Middle Pleistocene lishi loess,and Lower Pleistocene Wucheng loess.The loess in Linfen basin has been so far in a tectonic uplift environment in the context of its formation.In particular,the tectonic uplift has been more sharp in the post deposition period of the loess,since the later stage of middle pleistocene.The loess in Linfen basin,like that on the middle reach of the Huanghe river, was formed in a arid paleoclimate environment.In the process of their formation,there were 20 alternative warm-humid climate with arid-cold climate and there were 3 notable deterioration phases.Each climatic cycle consists of a warm-humid stage and an arid-cold stage.Totally 18 climate groups can be formed.These climatic groups and climatic cycles can be compared with paleoclimatic Change curve obtained by oxygen isotope study of cores of V_28～239 drillholes.

Key words: Paleoenvironmental analysis, Paleoclimate, Magnetic susceptibility, Iso-topic age dating, Loess