A combined luminescence and radiocarbon dating study of the Ili loess, Central Asia

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• 作者：Yougui Song ; Chuanxiang Li ; Jingdong Zhao ; Peng Cheng ; Mengxiu Zeng
• 关键词：Luminescence dating ; Radiocarbon dating ; Ili loess ; Central Asia
• 刊名：Quaternary Geochronology
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：10
• 期：Complete
• 页码：2-7
• 全文大小：611 K

文摘

Similar to the loess in the Chinese Loess Plateau (CLP), the loess deposits in the Ili basin of Central Asia arid area play an important role in understanding the climate and environmental changes. However, in contrast to the intensively investigated loess deposits in the CLP, the Ili loess is still insufficiently known and poorly understood. The geochronology study of the Ili loess remains controversial. In order to examine the potential of optically stimulated luminescence (OSL) dating for the Ili loess, we carry out a combined luminescence and radiocarbon dating study on a 6.9?m loess section in the south margin of the Ili basin. Polymineral fine grains were investigated by post infrared (IR) OSL using a Multiple-Aliquot Regenerative-dose (MAR) protocol. Radiocarbon dating of organic carbon were carried in a 3 Megavolt (MV) multi-element Accelerator Mass Spectrometry (AMS). The results indicate that the OSL ages are in agreement with the observed stratigraphy in the field, which is well correlated with that of the CLP, but the AMS ¹⁴C ages are much younger than the OSL and assumed stratigraphical ages. Thus, the OSL dating technique may provide an absolute chronology in this loess section. Further methodological approaches and more samples analysis will lead to the improvement of this chronology for high-resolution paleoclimatic interpretation.