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Experimental investigation into the disturbance of the Sm-Nd isotopic system during metasomatic alteration of apatite

文献类型：期刊论文

作者Li, Xiao-Chun2,4,8; Harlov, Daniel E.3,5,6,7; Zhou, Mei-Fu1; Hu, Hao3,5
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-08-01
卷号330页码:191-208
关键词Hydrothermal experiments Apatite Metasomatic alteration Sm-Nd isotopes REE mobility
ISSN号0016-7037
DOI10.1016/j.gca.2021.04.036
英文摘要In order to understand the effect of fluid-induced alteration on the Sm-Nd isotope systematic in apatite, a series of fluid/ apatite reaction experiments, which involve reacting the well-characterized Durango fluorapatite with CO2 +/- CaCO3-, NaF- or HCl +/- CaCl2-bearing solutions with a known Nd-143/Nd-144 ratio, were conducted at 800 or 600 degrees C at 200 MPa. In experiments involving CO2-H2O +/- CaCO3, the fluorapatite grains did not react with the solution, such that the Sm-Nd isotopic system was undisturbed. In experiments involving NaF, the fluorapatite grains were partially to completely altered. During the alteration process, REE mobilization was retarded via the coupled substitution Na+ + REE3+ = 2Ca(2+) due to the high activity of Na in the fluid. Because the REE were not mobilized, the 147 Sm/144 Nd ratios remained constant. However, the Nd-143/Nd-144 ratios were slightly altered due to small degrees of Nd isotopic exchange between the fluid and fluorapatite. In experiments involving HCl +/- CaCl2, the fluorapatite grains were partially altered, and the REE were variably leached from the altered fluorapatite. Leaching of REE was accompanied by an increase in the Sm-147/Nd-144 ratio, which is related to the higher compatibility of Sm in the fluorapatite structure and the lower mobility of Sm in Cl-bearing fluids. Although the Sm-147/Nd-144 ratios were strongly affected, the Nd-143/Nd-144 ratios experienced only a small change, which is related to the slow rate of transport for Nd between reaction-front fluid and bulk fluid. In general, the experimental results indicate that fluid chemistry is the main factor controlling the response of the Sm-Nd isotopic system to fluid-induced alteration. The Sm-147/Nd-144 ratio of apatite can be highly modified, and in turn the Sm-Nd isotopic system is disturbed when the fluids are rich in ligands that are able to facilitate REE mobilization and fractionation. Therefore, a thorough evaluation of the fluid-rock history, along with the conjectured fluid chemistry, is necessary before using apatite Sm-Nd isotopes as geological indicators. (c) 2021 Elsevier Ltd. All rights reserved.
WOS关键词RARE-EARTH-ELEMENTS ; MINERAL REPLACEMENT REACTIONS ; TRACE-ELEMENT ; HYDROTHERMAL MOBILIZATION ; ACCESSORY MINERALS ; CHINA CONSTRAINTS ; FLUID INCLUSIONS ; MO DEPOSIT ; PART II ; U-PB
资助项目National Natural Science Foundation of China (NSFC)[42072092] ; DAAD
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000910861900012
出版者PERGAMON-ELSEVIER SCIENCE LTD
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) ; DAAD ; DAAD ; DAAD ; DAAD ; 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) ; DAAD ; DAAD ; DAAD ; DAAD ; 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) ; DAAD ; DAAD ; DAAD ; DAAD ; 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) ; DAAD ; DAAD ; DAAD ; DAAD
源URL[http://ir.iggcas.ac.cn/handle/132A11/106899]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Li, Xiao-Chun
作者单位1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
6.Univ Johannesburg, Dept Geol, POB 524, ZA-2006 Auckland Pk, South Africa
7.GeoForschungsZentrum, Potsdam, Germany
8.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xiao-Chun,Harlov, Daniel E.,Zhou, Mei-Fu,et al. Experimental investigation into the disturbance of the Sm-Nd isotopic system during metasomatic alteration of apatite[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,330:191-208.
APA Li, Xiao-Chun,Harlov, Daniel E.,Zhou, Mei-Fu,&Hu, Hao.(2022).Experimental investigation into the disturbance of the Sm-Nd isotopic system during metasomatic alteration of apatite.GEOCHIMICA ET COSMOCHIMICA ACTA,330,191-208.
MLA Li, Xiao-Chun,et al."Experimental investigation into the disturbance of the Sm-Nd isotopic system during metasomatic alteration of apatite".GEOCHIMICA ET COSMOCHIMICA ACTA 330(2022):191-208.

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来源：地质与地球物理研究所

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