Boron isotopic compositions in growing corals from the South China Sea

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	Boron isotopic compositions in growing corals from the South China Sea
	Xiao, Jun 1; Xiao, Yingkai 2; Jin, Zhangdong 1; Liu, Congqiang 3; He, Maoyong 1
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013-01-30
卷号	62 页码:561-567
关键词	Coral Trace Element Boron Isotope Delta B-11-ph Proxy South China Sea
文献子类	Article
英文摘要	In order to determine incorporation of boron species, boron isotopic fractionation, and influence of trace elements on isotopic compositions of boron in corals (delta B-11(coral)), concentrations of Mg, Sr, Na, B and delta B-11(coral) in growing corals from the South China Sea were measured. Relative to seawater, Sr enriched while Mg depleted in corals in the South China Sea. Although the delta B-11(coral) values were different from various species and were not closely correlated with the element concentrations in corals in the South China Sea, Mg(OH)(2) existed in corals can result in high delta B-11(coral). Thus, it is necessary to examine the existence of Mg(OH)(2) and to choose the same species when delta 11B(coral) is used in the (delta B-11-pH proxy. Based on the measured delta B-11 values of corals and coexisting seawater as well as the seawater pH in the South China Sea, a new isotopic fractionation factor a(4-3) between B(OH)(4)(-) and B(OH)(3) was determined to be 0.979. Besides B(OH)(4)(-) into corals, our results showed that B(OH)(3) may also be incorporated into corals with variable proportions. The incorporation of B(OH)(3) into corals may challenge the hypothesis of delta 11B(coral) = delta B-11(4) resulting in increasing uncertainty to the calculated seawater pH values to the delta B-11-pH proxy. We suggested that a best-fit empirical equation between delta B-11 of bio-carbonates and seawater pH needs to be established by the precipitation experiments of inorganic carbonates or culture experiments of corals or foraminifera. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
WOS关键词	SYNTHETIC CALCIUM-CARBONATE ; GREAT-BARRIER-REEF ; B-11 MAS NMR ; SURFACE TEMPERATURE ; ION-EXCHANGE ; SEAWATER PH ; OCEAN PH ; FRACTIONATION ; RATIOS ; PROXY
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000315076500043
内容类型	期刊论文
源URL	[http://ir.isl.ac.cn/handle/363002/4419]
专题	青海盐湖研究所_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, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salk Lakes, Xining 810008, Qinghai, Peoples R China 3.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Jun,Xiao, Yingkai,Jin, Zhangdong,et al. Boron isotopic compositions in growing corals from the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,62:561-567.
APA	Xiao, Jun,Xiao, Yingkai,Jin, Zhangdong,Liu, Congqiang,&He, Maoyong.(2013).Boron isotopic compositions in growing corals from the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,62,561-567.
MLA	Xiao, Jun,et al."Boron isotopic compositions in growing corals from the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 62(2013):561-567.