Multi-proxy evidence for Late Pleistocene-Holocene climatic and environmental changes in Lop-Nur,Xinjiang,Northwest China  

作　　者：LUO Chao YANG Dong PENG Zicheng ZHANG Zhaofeng LIU Weiguo HE Jianfeng ZHOU Chenlin 

机构地区：[1]School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China [2]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi＇an 710054, China [3]Department of Geology, University of lllinois-Urbana Champaign, Urbana, IL 61801, U.S.A. [4]Illinois State Geological Survey, 615 East Peabody Drive, Champaign, IL61820, U.S.A.

出　　处：《Chinese Journal Of Geochemistry》2008年第3期257-264,共8页中国地球化学学报

基　　金：supported by the NKBRSF Project Fund(2004CB720208);the National Natural Science Foundation of China(Nos.40599424 and 40473006);Institutions of Higher Learning Doctorate Foundation(No.20050358006).

摘　　要：A 10.35-m-long sediment core from the Luobei depression in Lop-Nur,Xinjiang,Northwest China,provides detailed information about environmental changes during the Late Pleistocene.The samples taken every 5 cm of the core were analyzed for 10 environmental proxies,including magnetic susceptibility,granularity,chroma,carbonate and loss on ignition(LOI),and pH value.The chronology data are provided by the uranium/thorium disequi-librium dates.The sediments of the section were deposited during the last 32000 years.The results of analysis of 10 proxies were examined using multivariate statistical analysis,and the principal components were calculated.According to the results,the Late Pleistocene sequence contains four climatic and environmental stages appearing in the cycles of cold-wet and warm-dry changes.During 10-9 ka BP,it was the earliest warm episode in the Holocene.Environmental changes in this district were restricted by global change,as suggested by the analysis of glacial-interglacial cycles.But it was different from the mutative trend of a monsoon region in East China because of its own characteristics,which was the situation of cold-wet and warm-dry climate-environment change.The candidate reason may be the uplift of the Tibet Plateau and the westerly wind circulation.A 10.35-m-long sediment core from the Luobei depression in Lop-Nut, Xinjiang, Northwest China, pro- vides detailed information about environmental changes during the Late Pleistocene. The samples taken every 5 cm of the core were analyzed for 10 environmental proxies, including magnetic susceptibility, granularity, chroma, car-bonate and loss on ignition （LOI）, and pH value. The chronology data are provided by the uranium/thorium disequi-librium dates. The sediments of the section were deposited during the last 32000 years. The results of analysis of 10 proxies were examined using multivariate statistical analysis, and the principal components were calculated. According to the results, the Late Pleistocene sequence contains four climatic and environmental stages appearing in the cycles of cold-wet and warm-dry changes. During 10-9 ka BP, it was the earliest warm episode in the Holocene. Environmental changes in this district were restricted by global change, as suggested by the analysis of glacial-interglacial cycles. But it was different from the mutative trend of a monsoon region in East China because of its own characteristics, which was the situation of cold-wet and warm-dry climate-environment change. The candidate reason may be the uplift of the Tibet Plateau and the westerly wind circulation.

关 键 词：更新世沉积物 气候变化 环境代理 新疆 

分 类 号：P59[天文地球—地球化学]