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Boron isotope geochemistry of Zigetang Co saline lake sediments, Tibetan Plateau
Xiaodan Wang;  Congqiang Liu;  Zhiqi Zhao;  Shijie Li;  Gangjian Wei
2017
Source PublicationActa Geochimica
Volume36Issue:3Pages:437-439
Abstract

The origin of boron in boron-rich salt lakes in the Tibetan Plateau is highly controversial. In this study, we carried out a detailed study on boron geochemistry and isotope composition of lake sediments collected in Zigetang Co, central Tibet. Evaporites had high boron concentrations of 172.3-418.6 g/g and delta~(11)B values of-8.2%o to -3.3,suggesting a non-marine origin for the saline lake. The boron isotopic fractionation factor, alpha, between evaporite and brackish water (alpha_(evaporite-brackish)) decreased systematically with depth, from 0.9942 at the top of the drill core to 0.9893 at the bottom; the linear variation between alpha_(evaporite-brackish) and depth reflects boron isotopic fractionation associated with progressive crystallization. The positive correlation between delta~(11)B versus [B] and delta~(11)B versus depth in the evaporite phase reflects pH and boron speciation in the solution control on the adsorption of boron, and B(OH)_3 species incorporated preferentially into Mg(OH)_2 precipitation at high pH.

KeywordBoron Isotopes Zigetang Co Equilibrium Isotopic Fractionation Boron Concentration
Indexed ByEI
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7732
Collection环境地球化学国家重点实验室
Affiliation1.Institute of Geochemistry, Chinese Academy of Sciences, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550002, China
2.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, State Key Laboratory of Organic Geochemistry, Guangzhou, Guangdong 510640, China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Xiaodan Wang;Congqiang Liu;Zhiqi Zhao;Shijie Li;Gangjian Wei. Boron isotope geochemistry of Zigetang Co saline lake sediments, Tibetan Plateau[J]. Acta Geochimica,2017,36(3):437-439.
APA Xiaodan Wang;Congqiang Liu;Zhiqi Zhao;Shijie Li;Gangjian Wei.(2017).Boron isotope geochemistry of Zigetang Co saline lake sediments, Tibetan Plateau.Acta Geochimica,36(3),437-439.
MLA Xiaodan Wang;Congqiang Liu;Zhiqi Zhao;Shijie Li;Gangjian Wei."Boron isotope geochemistry of Zigetang Co saline lake sediments, Tibetan Plateau".Acta Geochimica 36.3(2017):437-439.
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