• 责任者：Ran Min (Key Laboratory of Western China’s Environmental Systems ; Ministry of Education ; Lanzhou University ; Lanzhou 730000 ; China) ; Yang Qili
• 刊名：Arid Land Geography
• 出版年：2013
• 卷期：36(6)
• 关键词：全新世 ; Holocene ; 黄土 ; loess ; 哈萨克斯坦 ; Kazakhstan
• 页码：p.979-986
• 图表：4 illus., 1 table, 33 refs.
• 分类号：1400
• issnNo：ISSN1000-6060
• isbnNo：CN65-1103/X

     The loess-covered area of Central Asia is surrounded by other three loess areas, including European loess area, Siberia loess area and Chinese Loess Plateau. Therefore, the loess deposits in Central Asia is of great sig nificance in clearifying the similarities and differences of loess deposits between Central Asia and other loess areas and in understanding the regional climate importance in terms of loess deposition and paleosol development. Clima tologically, Central Asian arid zone is affected by the Asian monsoon and the westerlies, understanding the regional paleoclimate change allows us to clarify the interacting history of the Asian monsoon and the westerlies. This paper focused on a loess section （VA section） in central Asian, combined with field investigation and laboratory analysis （grain size, magnetic susceptibility, total organic matter and carbonate content）, based on AMS ^14C dates, construct ed the strata sequence in VA section during past -25 000 a. The results indicate that the strata sequence in study ar ea during past -25 000 a BP can be divided into five units ： ① -26000 ^14C a BP--22 000 ^14C a BP, a fluvially-al tered loess deposition layer; ② -22 000 ^14C a BP--19 000 ^14C a BP, a weakly-gleyed loess deposition layer; ③ 19 000 ^14C a BP--10 000 ^14C a BP, an accretionary entisol layer; ④ -10 000 ^14C a BP--5000 ^14C a BP, a major loess deposition layer; ⑤ past -5 000 ^14C a, a typical mollisol layer. Furthermore, the regional comparison of loess strata in Central Asia and Europe indicates that the VA section loess is similar to the Europe loess during the past - 25 000 ^14C a BP and there is a converse phase relationship between VA loess strata and East Asian loess strata dur ing the past -25 000 ^14C a BP. Based on the VA loess section, the predominant gaciation between -25 000 and - 10 000 ^14C a BP suggested that the last glacial climate in the Central Asia domain was constantly wetter than that in the East Asia domain.