Boron isotopic fractionation in laboratory inorganic carbonate precipitation: evidence for the incorporation of B(OH)(3) into carbonate

ISL OpenIR > 青海盐湖研究所知识仓储

	Boron isotopic fractionation in laboratory inorganic carbonate precipitation: evidence for the incorporation of B(OH)(3) into carbonate
	Xiao YingKai 1,2; Li HuaLing 1,3; Liu WeiGuo 4; Wang XiuFang 1; Jiang ShaoYong 5
	2008-12-01
发表期刊	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
卷号	51 期号:12 页码:1776-1785
关键词	Boron Isotopic Fractionation Biogenic Carbonate b(Oh)(3) Incorporation
摘要	A laboratory inorganic carbonate precipitation experiment at high pH of 8.96 to 9.34 was conducted, and the boron isotopic fractionations of the precipitated carbonate were measured. The data show that boron isotopic fractionation factors (alpha(carb-3)) between carbonate and B(OH)(3) in seawater range 0.937 and 0.965, with an average value of 0.953. Our results together with those reported by Sanyal and collaborators show that the alpha(carb-3) values between carbonate and B(OH)(3) in solution are not constant but are negatively correlated with the pH of seawater. The measured boron isotopic compositions of carbonate precipitation (delta 11B(carb)) do not exactly lie on the best-fit theoretical delta 11B(4)-pH curves and neither do they exactly parallel any theoretical delta 11B(4)-pH curves. Therefore, it is reasonable to argue that a changeable proportion of B(OH)(3) with pH of seawater should also be incorporated into carbonate except for the dominant incorporation of B(OH)(4) - in carbonate. Hence, in the reconstruction of the paleo-pH of seawater from boron isotopes in marine biogenic carbonates, the use of theoretical boron isotopic fractionation factor (alpha(4-3)) between B(OH)(4-) and B(OH)(3) is not suitable. Instead, an empirical equation should be established.
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/363002/5847
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.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China 2.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China 3.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 5.Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Xiao YingKai,Li HuaLing,Liu WeiGuo,et al. Boron isotopic fractionation in laboratory inorganic carbonate precipitation: evidence for the incorporation of B(OH)(3) into carbonate[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2008,51(12):1776-1785.
APA	Xiao YingKai,Li HuaLing,Liu WeiGuo,Wang XiuFang,&Jiang ShaoYong.(2008).Boron isotopic fractionation in laboratory inorganic carbonate precipitation: evidence for the incorporation of B(OH)(3) into carbonate.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,51(12),1776-1785.
MLA	Xiao YingKai,et al."Boron isotopic fractionation in laboratory inorganic carbonate precipitation: evidence for the incorporation of B(OH)(3) into carbonate".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 51.12(2008):1776-1785.