气候变化领域集成服务门户(CCPortal): Temporal variability of C-14 reservoir effects and sedimentological chronology analysis in lake sediments from Chibuzhang Co, North Tibet (China)

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DOI	10.1016/j.quageo.2019.02.009
	Temporal variability of C-14 reservoir effects and sedimentological chronology analysis in lake sediments from Chibuzhang Co, North Tibet (China)
	Chen, Hao; Zhu, Liping; Ju, Jianting; Wang, Junbo; Ma, Qingfeng
通讯作者	Zhu, LP (通讯作者)
发表日期	2019
ISSN	1871-1014
EISSN	1878-0350
起始页码	88
结束页码	102
卷号	52
英文摘要	Chronological analysis is the basic premise for paleoenvironmental research on lake sediment cores. It mainly employs bulk organic matter as a mixed dating material, although terrestrial plant remains are believed to provide reliable radiocarbon (C-14) ages. C-14 reservoir effects (REs) are generally problematic in establishing a final chronology and are usually recorded in aquatic macrophytes by the incorporation of dissolved inorganic carbon in high-altitude lakes of the Tibetan Plateau. We present a typical case of a 5.48 m-long core sampled from Chibuzhang Co, a lake in north Tibet, China, which contained two obvious obstacles: high REs and age reversals. The C-14 RE was recently as much as similar to 3500 years in the upper part according to total organic carbon (TOC) C-14 ages and related dating from (210)Pbe(x,) activity. It notably changed during the climatic transition to the Holocene due to carbonate input from catchment erosion and glacial meltwater, resulting in reversed C-14 ages in the lower section of the core. C-14-dead carbon (or old carbon) dissolved in lake water was incorporated in the dating materials, as inferred from the C-14 ages of plant samples. By combining data on grain size and carbonate content changes, two sedimentary units were identified with a boundary at 390 cm depth. These were used to estimate individual sediment accumulation rates (SARs) for the final age-depth models, instead of using a constant RE-corrected chronology. Our results provide an environmental history of similar to 12.7 kyr in a long sediment core, based on an optimized SAR model of conventional C-14 ages, which is supported by related lacustrine records and Bacon models. Use of separate C-14 SAR analyses can solve the problem of age inversion in sediment cores, as sedimentological chronology analysis.
关键词	RADIOCARBON CHRONOLOGIES ENVIRONMENTAL-CHANGES TARO CO NAM-CO PLATEAU LACUSTRINE CLIMATE AGE PLANT EVOLUTION
英文关键词	Lake sediment; Radiocarbon reservoir effect; Age reversal; Deposition rate; Age-depth model; Tibetan Plateau
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000471081100008
来源期刊	QUATERNARY GEOCHRONOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259440
推荐引用方式 GB/T 7714	Chen, Hao,Zhu, Liping,Ju, Jianting,et al. Temporal variability of C-14 reservoir effects and sedimentological chronology analysis in lake sediments from Chibuzhang Co, North Tibet (China)[J]. 中国科学院青藏高原研究所,2019,52.
APA	Chen, Hao,Zhu, Liping,Ju, Jianting,Wang, Junbo,&Ma, Qingfeng.(2019).Temporal variability of C-14 reservoir effects and sedimentological chronology analysis in lake sediments from Chibuzhang Co, North Tibet (China).QUATERNARY GEOCHRONOLOGY,52.
MLA	Chen, Hao,et al."Temporal variability of C-14 reservoir effects and sedimentological chronology analysis in lake sediments from Chibuzhang Co, North Tibet (China)".QUATERNARY GEOCHRONOLOGY 52(2019).