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Rubidium isotope compositions of the average upper continental crust and the Himalayan leucogranites: Implications for magmatic-fluid interaction

文献类型：期刊论文

作者Hu, Xia3; Nan, Xiaoyun1,3; Liu, Xiaochi2; Huang, Fang1,3
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-11-01
卷号336页码:165-176
关键词Rubidium isotopes Upper continental crust Granites Himalayan leucogranite Magmatic -fluid interaction
ISSN号0016-7037
DOI10.1016/j.gca.2022.09.015
英文摘要Rubidium is a highly fluid-mobile and incompatible element. Rb isotopes have great potential to trace the migration and enrichment of Rb in magmatic and fluid-related processes. In order to decipher the behavior of Rb isotopes during magmatic-fluid interaction, this study presents an estimate of average delta Rb-87 of the upper continental crust (UCC) and Rb isotope data for highly evolved leucogranites from Kampa, Himalayan orogen. The samples used to estimate the average UCC include 21 granites, 42 loess, and 10 sediments, which show small variations from-0.27 parts per thousand to 0.02 parts per thousand,-0.17 parts per thousand to-0.07 parts per thousand, and-0.31 parts per thousand to 0.07 parts per thousand, respectively. Based on the weighted average delta Rb-87 of these samples, the estimate of average Rb isotope composition of UCC is-0.14 +/- 0.01 parts per thousand (2SD/,/n, n = 73), which is consistent with the delta Rb-87 of the bulk BSE (-0.13 +/- 0.01 parts per thousand). A comparison of the Kampa leucogranites with the UCC indicates that the delta Rb-87 of the Kampa leucogranites (-0.29 parts per thousand to 1.20 parts per thousand) is significantly higher than the average value of the UCC. Such heavy Rb isotope composition cannot be due to chemical weathering, source heterogeneity, fractional crystallization, or partial melting. Instead, because the Kampa leucogranites have been modified by magmatic fluids during magma evolution, the high delta Rb-87 most likely reflects the signature of magmatic fluids derived from deeper magma. Our study for the first time indicates that the heavy Rb isotope characteristics of highly fractionated leucogranites provide a novel tracer for processes involving fluid activity. This could be useful for understanding the enrichment and mineralization of rare metals related to magmatic fluids. (c) 2022 Published by Elsevier Ltd.
WOS关键词CHEMICAL-COMPOSITION ; SOUTH CHINA ; CONDENSATION TEMPERATURES ; TRACE-ELEMENTS ; LOESS ; ORIGIN ; FRACTIONATION ; CONSTRAINTS ; GRANITES ; ABUNDANCES
资助项目National Natural Science Foundation of China[42103057] ; National Natural Science Foundation of China[42003008] ; National Natural Science Foundation of China[42073007]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000865454200012
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/107772]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Huang, Fang
作者单位1.Univ Sci & Technol China, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Hu, Xia,Nan, Xiaoyun,Liu, Xiaochi,et al. Rubidium isotope compositions of the average upper continental crust and the Himalayan leucogranites: Implications for magmatic-fluid interaction[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,336:165-176.
APA Hu, Xia,Nan, Xiaoyun,Liu, Xiaochi,&Huang, Fang.(2022).Rubidium isotope compositions of the average upper continental crust and the Himalayan leucogranites: Implications for magmatic-fluid interaction.GEOCHIMICA ET COSMOCHIMICA ACTA,336,165-176.
MLA Hu, Xia,et al."Rubidium isotope compositions of the average upper continental crust and the Himalayan leucogranites: Implications for magmatic-fluid interaction".GEOCHIMICA ET COSMOCHIMICA ACTA 336(2022):165-176.

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来源：地质与地球物理研究所

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