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Carbon isotopes in surface-sediment carbonates of modern Lake Qinghai (Qinghai-Tibet Plateau): Implications for lake evolution in arid areas
Li, XZ (Li, Xiangzhong)[1]; Liu, WG (Liu, Weiguo)[1,2]; Xu, LM (Xu, Liming)[3]
2012-03-18
Source PublicationCHEMICAL GEOLOGY
Volume300Pages:88-96
Subtype期刊论文
Abstract

To further investigate the significance of carbon isotopes of lake carbonates in arid areas, we examined the carbon isotopic composition of ostracods, bulk carbonate, fine-grained carbonates, and associated water DIC (dissolved inorganic carbon) from Lake Qinghai and several small lakes and ponds surrounding Lake Qinghai. We obtained three major results. 1) The carbon isotopic compositions of ostracods, bulk carbonate, and fine-grained carbonates in the lakes and ponds are clearly correlated with water delta C-13(DIC) values, which vary with water salinity in the Lake Qinghai area. 2) The variation in the delta C-13(DIC) values of lake water is mainly controlled by CO2 exchanges between the atmosphere and lake waters in the Lake Qinghai area. 3) Ostracods, bulk carbonate and fine-grained carbonates show consistent trends of isotopic composition in the study area, and the differences in carbon isotopic composition between authigenic carbonates and ostracods may be explained by the differences in carbon isotopic composition between the DIC of surface water and that of the water near to the sediment-water interface as well as the 'vital offsets' of ostracods. Our results suggest that variations in the delta C-13 values of carbonates in Lake Qinghai and other lakes in this arid, high-altitude area are primarily controlled by the carbon-isotope ratios of the lake water DIC, which in turn are related to water salinity. Therefore, changes in carbonate delta C-13 values may be used to indirectly indicate changes in water salinity in the Lake Qinghai area.

KeywordCarbon Isotopes Ostracods Bulk Carbonate Fine-grained Carbonates Dissolved Inorganic Carbon Lake Qinghai
DOI10.1016/j.chemgeo.2012.01.010
Indexed BySCI ; EI
Language英语
Citation statistics
Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10099
Collection加速器质谱中心
Corresponding AuthorLiu, WG (Liu, Weiguo)[1,2]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi'an, 710075, China;
2.School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China;
3.Qinghai Institute of Salt Lakes, CAS, Xining, 810008, China
Recommended Citation
GB/T 7714
Li, XZ ,Liu, WG ,Xu, LM . Carbon isotopes in surface-sediment carbonates of modern Lake Qinghai (Qinghai-Tibet Plateau): Implications for lake evolution in arid areas[J]. CHEMICAL GEOLOGY,2012,300:88-96.
APA Li, XZ ,Liu, WG ,&Xu, LM .(2012).Carbon isotopes in surface-sediment carbonates of modern Lake Qinghai (Qinghai-Tibet Plateau): Implications for lake evolution in arid areas.CHEMICAL GEOLOGY,300,88-96.
MLA Li, XZ ,et al."Carbon isotopes in surface-sediment carbonates of modern Lake Qinghai (Qinghai-Tibet Plateau): Implications for lake evolution in arid areas".CHEMICAL GEOLOGY 300(2012):88-96.
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