Evaluating the effect of leaching on trace element and Nd-Pb isotopic systematics in continental basalts

doi:10.1016/j.sesci.2018.12.001

	Evaluating the effect of leaching on trace element and Nd-Pb isotopic systematics in continental basalts
	Zhang, Yan 1,2,3; Wei, Xun 1,2,3; Shi, Xuefa 1,2; Xu, Yigang 3; Ren, Zhongyuan 3; Yan, Quanshu 1,2; Guan, Yili 1,2
刊名	SOLID EARTH SCIENCES
	2019-03
卷号	4 期号:1 页码:1-11
关键词	Tarim Large Igneous Province Trace element Nd-Pb isotopes Alteration Acid leaching
ISSN号	2451-912X
DOI	10.1016/j.sesci.2018.12.001
英文摘要	Leaching technique was mostly carried out on submarine rock powder to minimize or eliminate secondary effect of seawater interaction on Sr and Pb isotope magmatic signatures. However, the effect of leaching on trace element contents is comparatively poorly established. To investigate such effects, we have compared trace element and Nd-Pb isotopic data for acid leached similar to 290 Ma Keping basalts in the Tarim Large Igneous Province (NW China) with unleached data on the same rocks. Rare earth elements (REE), Y, Th and U contents of leached sample grains (0.6-1.0 mm size) are 10-65% lower than those of unleached grains of the same sample, whereas other trace elements are not affected. Sm/Nd, Lu/Hf, U/Pb and Th/Pb ratios are fractionated by acid leaching between leached and unleached sample grains. Nd isotope values are unaffected by leaching, but Pb-208/Pb-204 and Pb-206/Pb-204 values of leached samples are significantly lower than those of unleached samples. X-ray diffraction results suggest that removal of secondary epidote during the acid leaching process could result in the fractionation of REE, Y, Th and U contents, and Sm/Nd, Lu/Hf, U/Pb and Th/Pb ratios, and Pb-208/Pb-204 and Pb-206/Pb-204 values. These results suggest that when the samples have been leached with strong acid (>1N HCl), their trace element cannot be used to trace the sources and petrogenesis. If leaching is applied to old (e.g., >100 Ma) continental basalts in order to eliminate contamination during sample collection, storage, sawing and crushing, Th/Pb and U/Pb ratios used to calculate the initial Pb isotope values, should be obtained on the same leached samples. Copyright (C) 2019, Guangzhou Institute of Geochemistry. Production and hosting by Elsevier B.V.
资助项目	State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences[SKLabIG-KF-16-04] ; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences[SKLabIG-KF-16-05]
WOS关键词	RARE-EARTH-ELEMENTS ; SM-ND ; PLAGIOCLASE ; PARTITION ; ALLANITE ; MELT ; CLINOPYROXENE ; GEOCHEMISTRY ; MICROPROBE ; EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000462646800001
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/24706]
专题	自然资源部第一海洋研究所
通讯作者	Shi, Xuefa
作者单位	1.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, 6 Xianxialing Rd, Qingdao 266061, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yan,Wei, Xun,Shi, Xuefa,et al. Evaluating the effect of leaching on trace element and Nd-Pb isotopic systematics in continental basalts[J]. SOLID EARTH SCIENCES,2019,4(1):1-11.
APA	Zhang, Yan.,Wei, Xun.,Shi, Xuefa.,Xu, Yigang.,Ren, Zhongyuan.,...&Guan, Yili.(2019).Evaluating the effect of leaching on trace element and Nd-Pb isotopic systematics in continental basalts.SOLID EARTH SCIENCES,4(1),1-11.
MLA	Zhang, Yan,et al."Evaluating the effect of leaching on trace element and Nd-Pb isotopic systematics in continental basalts".SOLID EARTH SCIENCES 4.1(2019):1-11.