Arid
DOI10.1016/j.chemgeo.2012.01.010
Carbon isotopes in surface-sediment carbonates of modern Lake Qinghai (Qinghai-Tibet Plateau): Implications for lake evolution in arid areas
Li, Xiangzhong1; Liu, Weiguo1,2; Xu, Liming3
通讯作者Liu, Weiguo
来源期刊CHEMICAL GEOLOGY
ISSN0009-2541
EISSN1872-6836
出版年2012
卷号300页码:88-96
英文摘要

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. (C) 2012 Elsevier B.V. All rights reserved.


英文关键词Carbon isotopes Ostracods Bulk carbonate Fine-grained carbonates Dissolved inorganic carbon Lake Qinghai
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000302762400009
WOS关键词DISSOLVED INORGANIC CARBON ; STABLE-ISOTOPE ; OXYGEN-ISOTOPE ; ENVIRONMENTAL-CHANGE ; CLIMATE RECORD ; FRACTIONATION ; GEOCHEMISTRY ; OSTRACODS ; CHINA ; PHOTOSYNTHESIS
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构中国科学院地球环境研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/171751
作者单位1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China;
2.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China;
3.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
推荐引用方式
GB/T 7714
Li, Xiangzhong,Liu, Weiguo,Xu, Liming. Carbon isotopes in surface-sediment carbonates of modern Lake Qinghai (Qinghai-Tibet Plateau): Implications for lake evolution in arid areas[J]. 中国科学院地球环境研究所,2012,300:88-96.
APA Li, Xiangzhong,Liu, Weiguo,&Xu, Liming.(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, Xiangzhong,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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