Boron isotopes geochemistry of the Changjiang basin rivers

ISL OpenIR > 青海盐湖研究所知识仓储

	Boron isotopes geochemistry of the Changjiang basin rivers
	Chetelat, B.1; Liu, C. -Q.1; Gaillardet, J.2; Wang, Q. L.1; Zhao, Z. Q.1; Liang, C. S.1; Xiao, Y. K.3
	2009-10-15
发表期刊	GEOCHIMICA ET COSMOCHIMICA ACTA
卷号	73 期号:20 页码:6084-6097
摘要	We report analyses of B isotopic compositions in water and suspended particulate matter collected in the Changjiang and its main tributaries. We showed that four sources control the dissolved boron budget; namely atmospheric deposition, evaporite dissolution, anthropogenic inputs and silicate weathering. The contribution of silicate weathering to the dissolved B load ranges from 40% to 50% for the Changjiang main channel and from 45% to 88% for the main tributaries. The isotopic composition of dissolved boron derived from silicate weathering range from -3 parts per thousand up to +9 parts per thousand suggesting that isotopic fractionation occurs during silicate weathering. The boron isotopic composition of suspended particulate matter range from -11.4 parts per thousand to -6 parts per thousand. Boron derived from silicate weathering is preferentially carried out by the dissolved load which accounts for 30-96% of the total boron. We show that the isotopic compositions of both the dissolved load and suspended particulate matter are controlled by the competition between boron leaching and boron uptake into secondary phases. The first process is characterized by a loss of boron relative to the bedrock without apparent isotopic fractionation whereas the last one is associated to a large isotopic fractionation which enriches the dissolved boron in heavy isotope. (C) 2009 Elsevier Ltd. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5918
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.CAS, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China 2.Univ Paris 07, Inst Phys Globe, Equipe Geochim & Cosmochim, UMR 7579, F-75252 Paris 05, France 3.Chinese Acad Sci, Qinghai Inst Salk Lakes, Xining 810008, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Chetelat, B.,Liu, C. -Q.,Gaillardet, J.,et al. Boron isotopes geochemistry of the Changjiang basin rivers[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2009,73(20):6084-6097.
APA	Chetelat, B..,Liu, C. -Q..,Gaillardet, J..,Wang, Q. L..,Zhao, Z. Q..,...&Xiao, Y. K..(2009).Boron isotopes geochemistry of the Changjiang basin rivers.GEOCHIMICA ET COSMOCHIMICA ACTA,73(20),6084-6097.
MLA	Chetelat, B.,et al."Boron isotopes geochemistry of the Changjiang basin rivers".GEOCHIMICA ET COSMOCHIMICA ACTA 73.20(2009):6084-6097.