Experimental investigation of hydrogen isotope fractionation during hydration of olivine-hosted melt inclusions: Implications for D/H in Baffin Island picrites
文献类型：期刊论文
| 作者 | Zhang, Yuxiang3,4,5 ; Gaetani, Glenn5; Pamukcu, Ayla2; Monteleone, Brian5; Saper, Lee1,6
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| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 647页码:12 |
| 关键词 | Melt inclusion Olivine Hydration H+ diffusivity D/H Volatile |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2024.119052 |
| 通讯作者 | Zhang, Yuxiang(zhangyuxiang13@mails.ucas.ac.cn) ; Gaetani, Glenn(ggaetani@whoi.edu) |
| 英文摘要 | Olivine-hosted melt inclusions are used to investigate the hydrogen isotope compositions (D/H) of Earth's mantle reservoirs. Studies have shown, however, that hydrogen in melt inclusion can equilibrate rapidly in response to changes to the external environment via the diffusion of protons (H+) and deuterons (D+) through the host olivine. Given that protons diffuse faster than deuterons, a kinetic fractionation of hydrogen isotopes is expected to accompany both the hydration and dehydration of melt inclusions. Other volatile species in the melt inclusion may also be affected by changes to the internal pressure and/or oxygen fugacity (fO(2)). Here we report results from experiments designed to investigate the behaviors of volatiles and hydrogen isotopes during the hydration of olivine-hosted melt inclusions. We show that the concentration of H2O in initially H2O-poor inclusions increases rapidly (up to similar to 4 wt.% within 24 h) when the host olivine is in contact with aqueous fluid at 1200 degrees C and 300 MPa. The extent of hydration is controlled by time, temperature, melt inclusion volume, and H+ diffusion distance. Hydrogen isotopes initially become lighter (i.e., D/H decreases) as hydration proceeds, defining a negative correlation with H2O concentration. This trend reverses with increasing hydration as the inclusions must eventually equilibrate with the external fluid. These experimental results agree well with diffusion calculations carried out using a spherical geometry and a lattice diffusivity of 10(-11.2 +/- 0.2) m(2)/s for H+ at 1200 degrees C. Therefore, anomalously light hydrogen isotopes in olivine-hosted melt inclusions from Baffin Island may not be taken as representative of the composition of the mantle source unless post-entrapment hydration can be excluded as a possibility. An increase in CO2 concentration and a significant drop in sulfur concentration accompany hydration of the melt inclusions in our experiments. The former is consistent with an observed decrease in vapor bubble size and results from a hydration-induced internal pressure increase. The latter is ascribed to the exsolution of molten sulfide from the silicate melt, which might be related to a lower fO(2) in the experiments as compared to the starting materials. We find no evidence for exchange of F or Cl between the melt inclusion and external fluid. |
| WOS关键词 | CARBON-DIOXIDE SOLUBILITIES ; SULFIDE SATURATION SCSS ; RIDGE BASALTIC LIQUIDS ; OXYGEN FUGACITY ; SULFUR CONCENTRATION ; SILICATE MELTS ; WATER ; H2O ; TEMPERATURE ; PRESSURE |
| 资助项目 | US National Science Foundation (NSF)[OCE-2135901] ; National Key Research and Development Program of China[2023YFF0804304] ; National Key Research and Development Program of China[2023YFF0804301] ; National Natural Science Foundation of China[42206058] ; National Natural Science Foundation of China[42330409] ; National Natural Science Foundation of China[42221005] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001330777800001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/199303]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Zhang, Yuxiang; Gaetani, Glenn |
| 作者单位 | 1.Univ Edinburgh, Grant Inst, Sch Geosci, Edinburgh EH9 3FE, Scotland 2.Stanford Univ, Earth & Planetary Sci, Stanford, CA 94306 USA 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Shandong, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 5.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA 6.CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA |
| 推荐引用方式 GB/T 7714 | Zhang, Yuxiang,Gaetani, Glenn,Pamukcu, Ayla,et al. Experimental investigation of hydrogen isotope fractionation during hydration of olivine-hosted melt inclusions: Implications for D/H in Baffin Island picrites[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,647:12. |
| APA | Zhang, Yuxiang,Gaetani, Glenn,Pamukcu, Ayla,Monteleone, Brian,&Saper, Lee.(2024).Experimental investigation of hydrogen isotope fractionation during hydration of olivine-hosted melt inclusions: Implications for D/H in Baffin Island picrites.EARTH AND PLANETARY SCIENCE LETTERS,647,12. |
| MLA | Zhang, Yuxiang,et al."Experimental investigation of hydrogen isotope fractionation during hydration of olivine-hosted melt inclusions: Implications for D/H in Baffin Island picrites".EARTH AND PLANETARY SCIENCE LETTERS 647(2024):12. |
入库方式： OAI收割
来源：海洋研究所
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