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Isotopic fractionation of chlorine and potassium during chloride sublimation under lunar conditions

文献类型：期刊论文

作者Han, Ziyan2; Hui, Hejiu1,2,3; Wei, Haizhen1,2; Li, Weiqiang1,2
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2023-07-15
卷号353页码:112-128
ISSN号0016-7037
关键词Evaporation experiments Cl isotopes K isotopes Metal chlorides The Moon
DOI10.1016/j.gca.2023.05.007
英文摘要The Moon is depleted in volatile elements and compounds, and lunar samples exhibit a wide range of Cl isotopic compositions, which is believed to result from the volatilization of metal chlorides (e.g., NaCl, KCl, and FeCl2). However, the Cl isotopic fractionation behavior during volatilization is not well constrained, particularly for metal chlorides. Furthermore, the effect of metal chloride evaporation on metal isotopes is poorly known. In the present study, we performed NaCl and KCl sublimation experiments to study Cl and K isotopic fractionations at temperatures ranging from 923 K to 1061 K and at pressures of 7x10-5 bar to 1 bar in an N2 atmosphere. The isotope fractionation factors of 37/35Cl(& alpha;gas-solid) from NaCl sublimation experiments are 0.9985 & PLUSMN;0.0002, 0.9958 & PLUSMN;0.0004, and 0.99807 & PLUSMN;0.00004 at 1, 10-2, and 7x10-5 bar, respectively. Those of 41/39K(& alpha;gas-solid) and 37/35Cl (& alpha;gas-solid) from KCl sublimation experiments are 0.99884 & PLUSMN;0.00004 and 0.9988 & PLUSMN;0.0003 at 1 bar, 0.9977 & PLUSMN;0.0002 and 0.9972 & PLUSMN;0.0003 at 10-2 bar, and 0.9989 & PLUSMN;0.0002 and 0.9989 & PLUSMN;0.0001 at 7x10-5 bar, respectively. Chlorine and K isotopes fractionate more at 10-2 bar than at 7x10-5 bar and 1 bar. The saturation index in all the sublimation experiments was >95%, which resulted in near-equilibrium isotopic fractionation at the sublimation interface. Therefore, the isotopic fractionation was controlled by mass transfer processes in the gas and solid phases. The isotopic fractionation at 10-2 bar was controlled by the chemical diffusion of sublimated gas in an N2 atmosphere with almost no convection effect, (i.e., Pe number close to zero), whereas the isotopic fractionation at 1 bar was suppressed by atmospheric convection with a turbulence factor of 0.4 & PLUSMN;0.1 (i.e., Pe number >1). The extremely high sublimation rate and the very slow diffusion in the sublimating solid at 7x10-5 bar suppressed isotopic fractionations. Based on our experimental results, calculations using Cl/K and Na/K in lunar materials reveal that degassing of KCl contributed very little (<0.2%o) to the K isotopic fractionation (>0.58%o) during lunar magma ocean degassing. The Cl isotopic fractionation factor from lunar samples is similar to our results at 10-2 bar. This similarity of Cl isotope fractionation indicates that there may have been a transient atmosphere above the lunar magma ocean.
WOS关键词VAPOR-PRESSURES ; SODIUM-CHLORIDE ; SILICATE MELTS ; VAPORIZATION KINETICS ; EVAPORATION KINETICS ; MASS FRACTIONATION ; ORIGIN ; SURFACE ; MOON ; CL
资助项目National Natural Science Foundation of China (NSFC)[42125303] ; B-type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; China National Space Administration (CNSA)[D020205]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:001020368500001
资助机构National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA) ; China National Space Administration (CNSA)
源URL[http://ir.iggcas.ac.cn/handle/132A11/111261]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Hui, Hejiu
作者单位1.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
2.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Han, Ziyan,Hui, Hejiu,Wei, Haizhen,et al. Isotopic fractionation of chlorine and potassium during chloride sublimation under lunar conditions[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2023,353:112-128.
APA Han, Ziyan,Hui, Hejiu,Wei, Haizhen,&Li, Weiqiang.(2023).Isotopic fractionation of chlorine and potassium during chloride sublimation under lunar conditions.GEOCHIMICA ET COSMOCHIMICA ACTA,353,112-128.
MLA Han, Ziyan,et al."Isotopic fractionation of chlorine and potassium during chloride sublimation under lunar conditions".GEOCHIMICA ET COSMOCHIMICA ACTA 353(2023):112-128.

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来源：地质与地球物理研究所

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