| Nitrogen isotope fractionations among gaseous and aqueous NH4+ NH3, N-2, and metal-ammine complexes: Theoretical calculations and applications | |
| Li, Long1; He YY(何雨旸)2; Zhang, Zhe1; Liu, Yun3,4,5 | |
| Corresponding Author | Li, Long([email protected]) |
| Source Publication | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 2021-02-15 | |
| Volume | 295Pages:80-97 |
| ISSN | 0016-7037 |
| Abstract | Ammonium (NH4+), ammonia (NH3) and N-2 are key nitrogen species in geological nitrogen recycling. NH3 has also been proposed to play an important role in mobilizing base metals in the form of metal-ammine complexes in hydrothermal fluids. The nitrogen isotope fractionation factors among these nitrogen species in aqueous and gaseous phases are essential parameters to trace source signatures and geochemical properties in geological processes. However, the nitrogen isotope fractionation factors for metal-ammine complexes are largely absent, and the few existing nitrogen isotope fractionation factors for the aqueous NH4+ - aqueous NH3 pair show large discrepancy between experimental results and theoretical calculations. In this study, we employed the density functional theory to systematically calculate the nitrogen isotope fractionation factors among the nitrogen species that may occur in a hydrothermal system, i.e., gaseous N-2, gaseous and aqueous NH4+ and NH3, and ammine complexes of Co, Zn, Cu, Cd, Ag, Au, and Pt. Based on these new results, the large nitrogen isotope fractionations for the aqueous NH4+ - aqueous NH3 pair observed in previous experimental studies can be well explained by a combined effect of an equilibrium isotope fractionation between aqueous NH4+ and aqueous NH3 and a kinetic isotope fractionation during NH3 degassing from the solution. This suggests that the nitrogen isotopic behavior during NH3 degassing in natural hydrothermal system can be more complicated than previous thought. A numeric model is thus established here to quantify the combined isotopic effect on partial NH3 degassing. Using the new results of metal-ammine complexes, we also tested the hypothesis that nitrogen mobilization could be controlled by copper-ammine complex based on the copper concentration-delta N-1(5) relationship previously observed in meta-gabbros. (C) 2020 Elsevier Ltd. All rights reserved. |
| Keyword | Nitrogen isotope fractionation Ammonium Metal-ammine complex Ammonia degassing Hydrothermal fluid |
| DOI | 10.1016/j.gca.2020.12.010 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000614115300005 |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| Funding Project | NSERC-Discovery Grant ; China Postdoctoral Science Foundation[2019M660811] ; Chinese NSF[41530210] |
| Funding Organization | NSERC-Discovery Grant ; China Postdoctoral Science Foundation ; Chinese NSF |
| Classification | 一类 |
| Ranking | 2 |
| Contributor | Li, Long |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/86062 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 1.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada; 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 3.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China; 4.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei 230001, Peoples R China; 5.Chengdu Univ Technol, Coll Earth Sci, Int Ctr Planetary Sci, Chengdu 610059, Peoples R China |
| Recommended Citation GB/T 7714 | Li, Long,He YY,Zhang, Zhe,et al. Nitrogen isotope fractionations among gaseous and aqueous NH4+ NH3, N-2, and metal-ammine complexes: Theoretical calculations and applications[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,295:80-97.Rp_Au:Li, Long |
| APA | Li, Long,何雨旸,Zhang, Zhe,&Liu, Yun.(2021).Nitrogen isotope fractionations among gaseous and aqueous NH4+ NH3, N-2, and metal-ammine complexes: Theoretical calculations and applications.GEOCHIMICA ET COSMOCHIMICA ACTA,295,80-97. |
| MLA | Li, Long,et al."Nitrogen isotope fractionations among gaseous and aqueous NH4+ NH3, N-2, and metal-ammine complexes: Theoretical calculations and applications".GEOCHIMICA ET COSMOCHIMICA ACTA 295(2021):80-97. |
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| Jp2021088.pdf（870KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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