期刊
QUATERNARY GEOCHRONOLOGY
卷 10, 期 -, 页码 50-55出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2012.04.022
关键词
Quartz luminescence dating; Zeketai (ZKT) loess section; Yili River basin of Xinjiang Province in China; Comparison with C-14 ages; Palaeoenvironmental implications
The loess deposits surrounding the high mountainous regions of Central Asia play an important role in understanding environmental changes in Eurasia on orbital and sub-orbital timescales. However, problems with dating Central Asian loess have limited the interpretation of climatic and environmental data, especially on sub-orbital timescales. We selected a controversial loess section, Zeketai (ZKT, with a thickness of 23 m), in the Yili basin in Xinjiang Province in western China, to establish a detailed and systematic Optically Stimulated Luminescence (OSL) chronology. Quartz grains of 38-63 mu m were isolated from 15 samples and the single-aliquot regenerative-dose (SAR) protocol was employed for D-e determination. OSL ages are in stratigraphic order and range from 13.8 +/- 1 to 72 +/- 6 ka, suggesting continuous loess accumulation during the last glaciation. We compared these dating results with that of the previously published fine-grain sized quartz (4-11 mu m) using simplified multiple aliquot regenerative-dose (SMAR) protocol, and with the previous published radiocarbon dating (C-14) ages on snail shells. With the exception of three young samples from the upper 6 m of the section, the SMAR dating results are basically consistent with the results using the SAR protocol. Both the SMAR and SAR OSL ages are consistently older than the C-14 ages, and the radiocarbon date results should be used with caution since they appear to have been underestimated. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据