Behavior of lithium isotopes in the Changjiang River system: Sources effects and response to weathering and erosion

	Behavior of lithium isotopes in the Changjiang River system: Sources effects and response to weathering and erosion
	Qi-Lian Wang; Benjamin Chetelat; Zhi-Qi Zhao; Hu Ding; Si-Liang Li; Bao-Li Wang; Jun Li; Xiao-Long Liu
	2015
发表期刊	Geochimica et Cosmochimica Acta
卷号	151 期号:1 页码:117-132
摘要	Lithium (Li) concentrations and Li isotopic compositions of the main channel of the Changjiang River and its main tributaries were measured to better understand the geochemical behavior of Li and its isotopic fractionation during weathering and erosion. The Li concentrations of the dissolved loads of the main channel range from 475 to 4570 nmol/l and decrease from the upper reaches to the lower reaches; values are clearly higher than those reported for many of the world's largest rivers. Samples with very high Li concentrations are affected by the dissolution of evaporites in the headwater region. The delta Li-7 values of the particulate material has a narrow range (-4.7 parts per thousand to +0.7 parts per thousand), whereas the dissolved load has very variable delta Li-7 (+7.6 parts per thousand to +42.1 parts per thousand), with values increasing from the upper reaches to the lower reaches. After correction for contributions other than silicate weathering, we show that the Li isotopic compositions of the dissolved load reflect the balance between dissolution of primary minerals and preferential incorporation of the light isotope into secondary products of erosion which enrich the solution in Li-7. The evolution of the isotopic composition from the Upper Reaches to the Lower Reaches is mainly controlled by the fraction of Li incorporated/adsorbed in/onto secondary minerals, and in fine by probably the difference in weathering regimes (i.e. kinetic limited vs transport limited). We also show that the magnitude of the apparent isotopic fractionation between the bedrock and dissolved Li for example are not always only due to variation of the isotopic fractionation factor but might also be due to composition (Li content of the bedrock) and mineralogical controls. The composition of the eroded silicate crust estimated by a steady state mass balance reveals the important contribution of sedimentary rocks (shales) and highlights the effects of sedimentary recycling on the composition of the continental crust.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6004
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Qi-Lian Wang,Benjamin Chetelat,Zhi-Qi Zhao,et al. Behavior of lithium isotopes in the Changjiang River system: Sources effects and response to weathering and erosion[J]. Geochimica et Cosmochimica Acta,2015,151(1):117-132.
APA	Qi-Lian Wang.,Benjamin Chetelat.,Zhi-Qi Zhao.,Hu Ding.,Si-Liang Li.,...&Xiao-Long Liu.(2015).Behavior of lithium isotopes in the Changjiang River system: Sources effects and response to weathering and erosion.Geochimica et Cosmochimica Acta,151(1),117-132.
MLA	Qi-Lian Wang,et al."Behavior of lithium isotopes in the Changjiang River system: Sources effects and response to weathering and erosion".Geochimica et Cosmochimica Acta 151.1(2015):117-132.

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