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Metasomatic modification of Sr isotopes in apatite as a function of fluid chemistry

文献类型：期刊论文

作者Li, Xiao-Chun1,2; Harlov, Daniel E.3,4,5,6; Zhou, Mei-Fu4,5; Hu, Hao4,5
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-04-15
卷号323页码:123-140
关键词Apatite Sr isotopes CO2 HCl CaCl2 NaF Hydrothermal experiments
ISSN号0016-7037
DOI10.1016/j.gca.2022.02.025
英文摘要Apatite is a ubiquitous accessory mineral in crustal rocks. The Sr-isotope record of apatite has a wide range of applications in earth science studies. However, apatite has been documented to be easily altered by certain fluids. Currently, the impact of metasomatic alteration on Sr-isotopic abundances in apatite is not well known. In order to better understand this issue, well-characterized fluorapatite grains have been metasomatized experimentally at a temperature of 800 or 600 degrees C and a pressure of 200 MPa. Fluids used included a CO2-H2O mixture and NaF-, CaCl2-, and HCl-bearing solutions, all of which were doped with a standard solution with a known Sr-87/(86) Sr ratio. In the fluorapatite + CO2-H2O experiments, the fluorapatite grains were not altered by the fluids; thus, their Sr isotope compositions were generally kept unchanged. However, the other fluids induced partial to complete alteration of fluorapatite. In experiments involving the NaF- or HCl-bearing solutions, the Sr content remained constant or was increased in altered areas of the fluorapatite, and the Sr isotopes underwent changes with partial isotopic signature of the reacting solutions. In experiments involving CaCl2, the Sr content was decreased in the altered fluorapatite because high Ca activity in the solution caused Ca to replace Sr on the Ca site. Notably, the Sr isotopic ratios are still changed, although to a relatively small extent. The efficient Sr isotopic exchange between fluid and apatite is attributed to the rapid transport rate of Sr between the reaction-interface fluid and bulk fluid surrounding the apatite. This experimental study demonstrates that the response of apatite Sr isotopes to metasomatic alteration is mainly controlled by the chemistry of fluids. Overall, Sr isotopes become susceptible to hydrothermal alteration once the apatite is chemically reactive with the fluids. Therefore, it is important to evaluate the fluid-rock history, especially the conjectured fluid composition before using Sr isotopes from apatite as a geochemical tracer. (C) 2022 Elsevier Ltd. All rights reserved.
WOS关键词MINERAL REPLACEMENT REACTIONS ; TRACE-ELEMENT COMPOSITIONS ; (Y+REE)-PHOSPHATE MINERALS ; STRONTIUM DIFFUSION ; INDUCED NUCLEATION ; ICP-MS ; FLUORAPATITE ; DEPOSIT ; COMPLEX ; ROCK
资助项目National Natural Science Foundation of China (NSFC)[92162323]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000783255700006
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) ; 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) ; 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) ; 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)
源URL[http://ir.iggcas.ac.cn/handle/132A11/105145]  
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.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Deutsch GeoForschungsZentrum GFZ, D-14473 Potsdam, Germany
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
5.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China
6.Univ Johannesburg, Dept Geol, POB 524, ZA-2006 Auckland Pk, South Africa
推荐引用方式
GB/T 7714		 Li, Xiao-Chun,Harlov, Daniel E.,Zhou, Mei-Fu,et al. Metasomatic modification of Sr isotopes in apatite as a function of fluid chemistry[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,323:123-140.
APA Li, Xiao-Chun,Harlov, Daniel E.,Zhou, Mei-Fu,&Hu, Hao.(2022).Metasomatic modification of Sr isotopes in apatite as a function of fluid chemistry.GEOCHIMICA ET COSMOCHIMICA ACTA,323,123-140.
MLA Li, Xiao-Chun,et al."Metasomatic modification of Sr isotopes in apatite as a function of fluid chemistry".GEOCHIMICA ET COSMOCHIMICA ACTA 323(2022):123-140.

入库方式： OAI收割

来源：地质与地球物理研究所

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