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AMS Radiocarbon Dating Problems Between 10 and 8 Ka BP in Lacustrine Deposits from Lake Gun Nur, Northern Mongolia

Published online by Cambridge University Press:  18 July 2016

F Q Chang ,
H C Zhang ,
Q Z Ming ,
G J Chen ,
W X Zhang ,
Z T Shi  and
Z D Feng
F Q Chang
Affiliation:
Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geography, Yunnan Normal University, No. 1 Yuhua District, Chenggong, 650500 Kunming, China.
H C Zhang*
Affiliation:
Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geography, Yunnan Normal University, No. 1 Yuhua District, Chenggong, 650500 Kunming, China.
Q Z Ming
Affiliation:
Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geography, Yunnan Normal University, No. 1 Yuhua District, Chenggong, 650500 Kunming, China.
G J Chen
Affiliation:
Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geography, Yunnan Normal University, No. 1 Yuhua District, Chenggong, 650500 Kunming, China.
W X Zhang
Affiliation:
Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geography, Yunnan Normal University, No. 1 Yuhua District, Chenggong, 650500 Kunming, China.
Z T Shi
Affiliation:
Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geography, Yunnan Normal University, No. 1 Yuhua District, Chenggong, 650500 Kunming, China.
Z D Feng
Affiliation:
Department of Geology, Baylor University, Waco, Texas 76712, USA.
*
Corresponding author. Email: hucaizhang@yahoo.com.
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Abstract

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Accelerator mass spectrometry (AMS) radiocarbon dating a continuous core from Lake Gun Nur, northern Mongolia, shows a period between 10 and 8 ka BP that could not be dated accurately. Further dating on alkali-insoluble residue and humic acid from the same samples in the Gun Nur core suggest that this AMS 14C date anomaly is neither analytical nor material related. We hypothesize that the 14C anomaly may be derived from increasing production rates of 14C caused by diminished solar activity, a low 14CO2/14CO ratio in the atmosphere, or an unstable 14C flux in the lower atmosphere caused by changing geomagnetic field strength. Our results imply that the 14C data used for 14C age calibration cannot correct the age-depth regression between 8 and 10 ka BP to fit the age-depth model along with other time intervals.

Type
Articles
Information
Radiocarbon , Volume 53 , Issue 3 , 2011 , pp. 501 - 509
Copyright
Copyright © 2011 The Arizona Board of Regents on behalf of the University of Arizona 

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