Reevaluation of carbonate concentration and oxygen isotope records from Lake Qinghai, the northeastern Tibetan Plateau

doi:10.1016/j.quaint.2018.03.038

	Reevaluation of carbonate concentration and oxygen isotope records from Lake Qinghai, the northeastern Tibetan Plateau
	Liu, Hu 2,3; Wang, Huanye 2; Zhao, Cheng 1; Zhang, Pengjia 2,3; Liu, Weiguo 2,3; An, Zhisheng 2
刊名	QUATERNARY INTERNATIONAL
	2018-07-20
卷号	482 期号:4 页码:122-130
关键词	Carbonate Oxygen Isotope Last Glacial Maximum Lake Qinghai Northeastern Tibetan Plateau
DOI	10.1016/j.quaint.2018.03.038
文献子类	Article
英文摘要	Lake Qinghai is the largest lake on the Tibetan Plateau, and it is also one of the important sites for studying global environmental changes. Over the past 30 years, many studies have used oxygen isotope of authigenic carbonates from the lake as the proxy to infer past environmental and climate changes on the Plateau. However, debate on interpretations of isotopic data and their environmental implications still exist, largely due to the complex arid environment settings and multiple sources/species for carbonate minerals within the lake. In this study, we systematically analyze delta O-18 values in different-type carbonates collected [i.e. bulk carbonates, ostracode shells, Chara encrustations, and fine-grain (< 63 mu m) carbonate minerals] from modern lake sediments and surrounding soils, as well as the down-core delta O-18 values of bulk/fine-grain carbonates since the Last Glacial Maximum. Together with previously published delta O-18 records from ostracode shells, we try to re-evaluate the controlling factors of variations in lacustrine carbonate delta O-18 data and to infer environmental changes on the northeastern Tibetan Plateau since the Last Glacial Maximum. Our results show that the lake depth, or the size of the water body, is an important factor to influence the lake water and carbonate delta O-18 values. A shallow and small lake would be more easily influenced by precipitation delta O-18 which is characterized by negative values at Lake Qinghai region, while a deep and large lake would be better to reflect environmental changes such as the precipitation-evaporation balance. The "lake volume" effect might be an explanation for the negative carbonate delta O-18 values during the early Holocene, which was likely caused by an increased influence of negative delta O-18 values in precipitation and glacial melt water under a small and shallow water body. The delta O-18 values of ostracode shells and bulk carbonates show similar variations since both of them are dominated by lake water oxygen isotopic composition, but they still have distinct geochemical information. The isotopic differences between ostracode and bulk carbonates probably reflect the temperature differences between the surface and the bottom of lake water. In addition, the delta O-18 values of evaporative induced carbonates may correlate with carbonate contents, while those of Chara encrustations do not show any correlation with carbonate contents. Our results suggest that special caution would be necessary when using lacustrine delta O-18 values of authigenic carbonates to infer past hydrological and climate changes in an arid environment.
WOS关键词	CLIMATE VARIABILITY ; STABLE-ISOTOPES ; ENVIRONMENTAL-CHANGE ; BULK CARBONATES ; ABRUPT CHANGES ; NORTH-AMERICA ; HOLOCENE ; SEDIMENTS ; CHINA ; MONSOON
WOS研究方向	Physical Geography ; Geology
语种	英语
WOS记录号	WOS:000434685000010
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5131]
专题	地球环境研究所_加速器质谱中心
作者单位	1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hu,Wang, Huanye,Zhao, Cheng,et al. Reevaluation of carbonate concentration and oxygen isotope records from Lake Qinghai, the northeastern Tibetan Plateau[J]. QUATERNARY INTERNATIONAL,2018,482(4):122-130.
APA	Liu, Hu,Wang, Huanye,Zhao, Cheng,Zhang, Pengjia,Liu, Weiguo,&An, Zhisheng.(2018).Reevaluation of carbonate concentration and oxygen isotope records from Lake Qinghai, the northeastern Tibetan Plateau.QUATERNARY INTERNATIONAL,482(4),122-130.
MLA	Liu, Hu,et al."Reevaluation of carbonate concentration and oxygen isotope records from Lake Qinghai, the northeastern Tibetan Plateau".QUATERNARY INTERNATIONAL 482.4(2018):122-130.