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Dilemma of Dating on Lacustrine Deposits in an Hyperarid Inland Basin of NW China

Published online by Cambridge University Press:  18 July 2016

H C Zhang ,
Q Z Ming ,
G L Lei ,
W X Zhang ,
H F Fan ,
F Q Chang ,
B Wünnemann  and
K Hartmann
H C Zhang*
Affiliation:
National Laboratory of Western China's Environmental Systems, MOE; College of Earth Sciences and Environments, Lanzhou University, Lanzhou 730000, China; also Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (CAS), Nanjing 210008, China
Q Z Ming
Affiliation:
National Laboratory of Western China's Environmental Systems, MOE; College of Earth Sciences and Environments, Lanzhou University, Lanzhou 730000, China; also Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (CAS), Nanjing 210008, China College of Tourist and Geography, Yunnan Normal University, Kunming 650092, China
G L Lei
Affiliation:
National Laboratory of Western China's Environmental Systems, MOE; College of Earth Sciences and Environments, Lanzhou University, Lanzhou 730000, China; also Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (CAS), Nanjing 210008, China
W X Zhang
Affiliation:
National Laboratory of Western China's Environmental Systems, MOE; College of Earth Sciences and Environments, Lanzhou University, Lanzhou 730000, China; also Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (CAS), Nanjing 210008, China
H F Fan
Affiliation:
National Laboratory of Western China's Environmental Systems, MOE; College of Earth Sciences and Environments, Lanzhou University, Lanzhou 730000, China; also Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (CAS), Nanjing 210008, China
F Q Chang
Affiliation:
National Laboratory of Western China's Environmental Systems, MOE; College of Earth Sciences and Environments, Lanzhou University, Lanzhou 730000, China; also Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (CAS), Nanjing 210008, China
B Wünnemann
Affiliation:
Institute for Geographical Sciences, FU Berlin, Malteserstr. 74-100, 12249 Berlin, Germany
K Hartmann
Affiliation:
Institute for Geographical Sciences, FU Berlin, Malteserstr. 74-100, 12249 Berlin, Germany
*
Corresponding author. Email: zhanghc@niglas.ac.cn
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Abstract

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Conventional and accelerator mass spectrometry (AMS) radiocarbon, TL, OSL, and IRSL dating results on samples from the cores D100 and I70 from Ejina Basin, one of the most important inland basins in arid-hyperarid NW China, show that it is difficult to determine the ages of sediments at different depths. AMS ages of core D100 samples demonstrate that the sediments at depths from 10 to 90 m were formed between 14 to 30 kyr BP. The inverted ages from both the D100 and I70 cores imply that there was a strong reworking of the sediments during and after deposition processes. The inverted ages also indicate drastic fluctuations of groundwater bearing soluble organic matters, which might be related to neotectonic activities and climate changes during the period. Consequently, it is impossible to establish an accurate and reliable chronology for the cores based only on these dates. All AMS ages, if they are reliable and acceptable, indicate a high deposition rate (5∼8 mm/yr), and since all TL, OSL, and IRSL ages are much older than those given by AMS, it makes these methods questionable for determining the ages of lacustrine-fluvial-alluvial deposits.

Type
Articles
Information
Radiocarbon , Volume 48 , Issue 2 , 2006 , pp. 219 - 226
Copyright
Copyright © 2006 by the Arizona Board of Regents on behalf of the University of Arizona 

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