黄土高原南部全新世古土壤的沉积序列(英文)

编号 zgly0001586878

文献类型 期刊论文

文献题名 黄土高原南部全新世古土壤的沉积序列(英文)

作者 贾耀锋  黄春长  庞奖励  牛俊杰 

作者单位 CollegeofTourismandEnvironment  ShaanxiNormalUniversity 

母体文献 Journal of Geographical Sciences 

年卷期 2008年04期

年份 2008 

分类号 Q911 

关键词 ChineseLoessPlateau  loess  depositionandpedogenesis  EastAsianmonsoon  Holocene 

文摘内容 Optically stimulated luminescence(OSL) dating for polymineral fine-grained loess samples,collected in Laoguantai(LGT) section on the south of the Chinese Loess Plateau,was made by application of single-aliquot regenerative-dose(SAR) protocol.A ’Double-SAR’ procedure in which aliquots are subjected to both infrared(IR) and blue stimulations was used,and two sets of equivalent dose(De) determinations were produced and assumed to relate predominantly to feldspathic and quartz fine grain populations respectively.The OSL ages estimated from IRSL signals are smaller than those estimated from [post-IR] OSL signals due to the anomalous fading of feldspar IR signals,based on fading experiment.The young ages of the samples near ground surface may be originated from the post-depositional disturbance by the intensifying humanity’s cultivation since 3.0 ka BP in the Guanzhong Basin,south of the Chinese Loess Plateau.Based on OSL dating,as well as field observations and stratigraphic correlation,we determine the chronology of the LGT loess-paleosol sequence.In combination with climate proxy records,it is indicated that aeolian loess deposition and pedogenesis underwent polyphase changes during the Holocene,likely to have been driven by shifts in the East Asian monsoon.This suggests that aeolian loess deposition is episodic and highly variable,with contributions from non-aeolian processes such as alluvial deposition found in the area.