Boron isotope fractionation during brucite deposition from artificial seawater

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	Boron isotope fractionation during brucite deposition from artificial seawater
	J. Xiao; Y. K. Xiao; C. Q. Liu; Z. D. Jin
刊名	Climate of the Past
	2011
卷号	7 期号:3 页码:693-706
英文摘要	Experiments involving boron incorporation into brucite (Mg(OH)2) from magnesium-free artificial seawater with pH values ranging from 9.5 to 13.0 were carried out to better understand the incorporation behavior of boron into brucite and the influence of it on Mg/Ca-SST proxy and δ 11B-pH proxy. The results show that both the concentration of boron in deposited brucite ([B]d) and its boron partition coefficient (Kd) between deposited brucite and final seawater are controlled by the pH of the solution. The incorporation capacity of boron into brucite is almost the same as that into corals, but much stronger than that into oxides and clay minerals. The isotopic compositions of boron in deposited brucite (δ 11Bd) are higher than those in the associated arti- ficial seawater (δ 11Bisw) with fractionation factors ranging between 1.0177 and 1.0569, resulting from the preferential incorporation of B(OH)3 into brucite. Both boron adsorptions onto brucite and the precipitation reaction of H3BO3 with brucite exist during deposition of brucite from artificial seawater. The simultaneous occurrence of both processes determines the boron concentration and isotopic fractionation of brucite. The isotopic fractionation behaviors and mechanisms of boron incorporated into brucite are different from those into corals. The existence of brucite in corals can affect the δ 11B and Mg/Ca in corals and influences the Mg/Ca-SST proxy and δ 11B-pH proxy negatively. The relationship between δ 11B and Mg/Ca in corals can be used to judge the existence of brucite in corals, which should provide a reliable method for better use of δ 11B and Mg/Ca in corals to reconstruct paleo-marine environment.
学科主题	环境地球化学
语种	英语
公开日期	2018-01-02
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/7049]
专题	地球化学研究所_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	J. Xiao,Y. K. Xiao,C. Q. Liu,et al. Boron isotope fractionation during brucite deposition from artificial seawater[J]. Climate of the Past,2011,7(3):693-706.
APA	J. Xiao,Y. K. Xiao,C. Q. Liu,&Z. D. Jin.(2011).Boron isotope fractionation during brucite deposition from artificial seawater.Climate of the Past,7(3),693-706.
MLA	J. Xiao,et al."Boron isotope fractionation during brucite deposition from artificial seawater".Climate of the Past 7.3(2011):693-706.