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《GEOCHIMICA》 1996-01
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Lin Ruifen; WeiKeqin; ChengZhiyuan; WangZhixiang (Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. Guangzhou 510640)F. Gasse; J. Ch. Fontes; E. Gibert; P. Tucholka(Laboratoire D'Hydrologie et de Geochimie Isotopique, Universite de Paris-S  
This paper deals with the study of the lacustrine cores from the Manas Lake and the Late Quaternary palaeoclimatic evolution in western Xinjiang. Analyses were performed for the mineralogical compositions of the lake sediments, the stable isotopic contents of authigenic carbonates, and pollen influx and types and so on. The chronologic frame was extablished based on AMS 14C data on authigenic carbonates and organic matter. The palaeoclimatic significance of the δ18O profile of carbonates was enhanced in view of its close correlation with the strength of the Asian summer monsoon. Palaeoclimatic records from the Manas Lake suggest the presence of a Late Pleistocene humid episode during 37000 to 32000 a B.P., followed by a period of extreme aridity which was attributed to the Last Glacial Maximum. After a minor wet/ warm pulse occuringabout 12000 years ago, there was a Late Pleistocene-Holocene Transition period characterized by arid climate. The most important environmental change was recorded at  ̄10000 a B. P. The climate apparently got warmer and wetter since then, finally leading to the development of a steppe vegetation cover around the lake catchment. The low δ18O values of the authigenic carbonates, corresponding to wet / warm climate, reveal a maximum strength period of the Asian summer monsoon. The Early-Middle Holocene records indicate that the climate during that period was warmer and wetter than today, but it was punctuated by several short terms of arid conditions.Around 6000-4500 a B.P., a contraction period affected the Manas Lake and coincided with the return to desert vegetation.The second wet episode took place from  ̄4500 to 2500 a B.P., but it was interrupted by a dry spell from 3800 to 3500 a B.P.The record of last 2500 years shows climate unstability and the stepwise establishment of hypersaline conditions in the Manas Lake.
【Fund】: 国际原子能机构资助 国家自然科学基金
【CateGory Index】: P532
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