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A CAVEAT ON RADIOCARBON DATING OF ORGANIC- POOR BULK LACUSTRINE SEDIMENTS IN ARID CHINA
Yu, SY (Yu, Shi-Yong)[ 1,2 ]; Cheng, P (Cheng, Peng)[ 1 ]; Hou, ZF (Hou, Zhanfang)[ 1 ]
2004
Source PublicationRADIOCARBON
Volume56Issue:1Pages:127-141
Subtype期刊论文
Abstract

Characterized by a dry climate, the arid area of China represents a unique landscape. A proper understanding of the driving mechanisms behind the changes of this ecologically vulnerable landscape requires placing the instrumental records within a geological context. Lakes in this area bear rich information about past climatic and environmental changes presumably regulated by the westerlies at various timescales. The lacustrine records obtained in this area heavily rely on radiocarbon ages, which are usually subject to the temporal and spatial variability of the C-14 reservoir effect. Yet, little is known about the C-14 reservoir age of lacustrine systems in this area. This study reports an anomalously large C-14 reservoir age of about 11,000 +/- 2000 yr from a saline lake in NW China by comparing C-14 and OSL chronologies. The modeling study suggests that this age offset appears to be an inherent phenomenon in lacustrine systems, which mainly arises from the introduction of pre- aged organic matter from the catchment and the conversion of C-14-depleted dissolved inorganic carbon to organic matter by photosynthesis. Compared to the large age offset induced by the C-14-deficient exogenous carbon, the reservoir effect due to retention of organic matter in the lake water appears to be inconsequential. The results reveal the pitfall of C-14 dating on organic-poor bulk lacustrine sediments in this barren landscape, and thus highlight the need for alternate dating methods to constrain the chronology of lacustrine records.

DOI10.2458/56.16922
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9841
Collection加速器质谱中心
Corresponding AuthorYu, SY (Yu, Shi-Yong)[ 1,2 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi’an 710075, China;
2.Large Lakes Observatory, University of Minnesota Duluth, 2205 E. 5th Street, Duluth, Minnesota 55812, USA
Recommended Citation
GB/T 7714
Yu, SY ,Cheng, P ,Hou, ZF . A CAVEAT ON RADIOCARBON DATING OF ORGANIC- POOR BULK LACUSTRINE SEDIMENTS IN ARID CHINA[J]. RADIOCARBON,2004,56(1):127-141.
APA Yu, SY ,Cheng, P ,&Hou, ZF .(2004).A CAVEAT ON RADIOCARBON DATING OF ORGANIC- POOR BULK LACUSTRINE SEDIMENTS IN ARID CHINA.RADIOCARBON,56(1),127-141.
MLA Yu, SY ,et al."A CAVEAT ON RADIOCARBON DATING OF ORGANIC- POOR BULK LACUSTRINE SEDIMENTS IN ARID CHINA".RADIOCARBON 56.1(2004):127-141.
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