Xiuqi Shang

Chinese Academy of Sciences

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Weidong Sun

Qingdao National Laboratory for Marine Science and Technology

Ruifang Huang

Chinese Academy of Sciences

Sisi Liao

Shanghai Jiao Tong University

Shengyi Hu

Peking University

Rui Ji

Lanzhou University

Jiangnan Yang

Peking University

Jianqing Ji

Peking University

Lei Zhang

Union Hospital

Xianjun Fang

Planetary Science Institute

Zhe Chen

National Heart Lung and Blood Institute

Cooperative Institutions

Peking University

Chinese Academy of Sciences

Institute of Oceanology

Laoshan Laboratory

University of Chinese Academy of Sciences

Institute of Geology and Geophysics

Qingdao National Laboratory for Marine Science and Technology

Guangzhou Institute of Geochemistry

Chinese Academy of Geological Sciences

Ministry of Education of the People's Republic of China

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Contrasted Effect of Spinel and Pyroxene on Molecular Hydrogen (H2) Production during Serpentinization of Olivine

Minerals (2021)

Ruifang Huang Xing Ding Weidong Sun Xiuqi Shang

Serpentinization produces molecular hydrogen (H2) and hydrocarbons that can feed the colonies of microbes in hydrothermal vent fields, and therefore serpentinization may be important for the origins of life. However, the mechanisms that control molecular hydrogen (H2) production during serpentinization remain poorly understood. Here the effect of pyroxene minerals and spinel on molecular hydrogen (H2) generation during serpentinization is experimentally studied at 311–500 °C and 3.0 kbar, where olivine, individually and in combinations with pyroxene and/or spinel, is reacted with saline solutions (0.5 M NaCl). The results show a contrasting influence of spinel and pyroxeneon molecular hydrogen (H2) production. At 311 °C and 3.0 kbar, spinel promotes H2 generation by around two times, and pyroxene minerals decrease molecular hydrogen (H2) production by around one order of magnitude. Spinel leaches aluminum (Al) and chromium (Cr) during hydrothermal alteration, and Al and Cr enhance molecular hydrogen (H2) production. This is confirmed by performing experiments on the serpentinization of olivine with the addition of Al2O3 or Cr2O3 powders, and an increase in molecular hydrogen (H2) production was observed. Pyroxene minerals, however, not only leach Al and Cr, but they also release silica (SiO2) during serpentinization. The sharp decline in molecular hydrogen (H2) production in experiments with a combination of olivine and pyroxene minerals may be attributed to releases of silica from pyroxene minerals. With increasing temperatures (e.g., 400–500 °C), the effect of spinel and pyroxene minerals on molecular hydrogen (H2) production is much less significant, which is possibly related tothe sluggish kinetics of olivine serpentinization under these T-P conditions. In natural geological settings, olivine is commonly associated with spinel and pyroxene, and molecular hydrogen (H2) during serpentinization can be greatly affected.

Pyroxene

10.3390/min11080794

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Citations (3)

Effect of Fluid Salinity on Reaction Rate and Molecular Hydrogen (H₂) Formation During Peridotite Serpentinization at 300°C

Journal of Geophysical Research Solid Earth (2023)

Ruifang Huang Xiuqi Shang Yusheng Zhao Weidong Sun Xi Liu

Abstract We conducted hydrothermal experiments at 300°C and at pressure varying from 2.2 to 3.4 kbar to study the effect of fluid salinity on the coupling between molecular hydrogen (H 2 ) formation and olivine serpentinization, where peridotite and olivine with 25–50 μm of starting grain sizes were reacted with pure H 2 O and saline solutions (0.5, 1.5, and 3.3 M NaCl). Serpentine, the main hydrous mineral in most experiments, was quantified according to calibration curves based on Fourier‐transformed infrared spectroscopy and X‐ray diffraction analyses. Compared to pure H 2 O, saline solutions promote the hydrothermal alteration of olivine and peridotite. For experiments with peridotite and pure H 2 O, 67% of reaction extent was achieved after 14 days, which increased to 89% in experiments with medium‐salinity solutions (1.5 M NaCl) over the same period. Medium‐ and high‐salinity solutions inhibit H 2 formation during serpentinization, which is associated with the serpentinization of pyroxene especially clinopyroxene. The redox conditions were constrained according to the equilibrium H 2,aq = H 2,g , and very reducing conditions were achieved during the serpentinization of olivine and peridotite. This study is the first to show iowaite formation directly from peridotite serpentinization, indicating alkaline solutions. Thermodynamic calculations suggest that the hydrolysis of NaCl (NaCl + H 2 O = HCl + NaOH) may yield alkaline solutions, due to higher dissociation constants of NaOH compared to HCl. This study suggests that chlorine greatly influences the serpentinization of olivine and peridotite in natural geological settings. It also indicates that iowaite formation may not require oxidizing conditions as previously thought.

Peridotite

Brucite

Pyroxene

10.1029/2022jb025218

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Citations (9)

The effect of fluid salinity on the reaction rates and molecular hydrogen (H₂) formation during peridotite serpentinization

Goldschmidt Abstracts (2023)

Ruifang Huang Weidong Sun Xiuqi Shang

Peridotite

10.7185/gold2023.14124

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Arc signatures in abyssal peridotites and its implications

Deep Sea Research Part I Oceanographic Research Papers (2023)

Jixin Wang Xiuqi Shang Qiang Ma Chen Chen Yang Liu

Forearc

Abyssal zone

Adakite

Hotspot (geology)

10.1016/j.dsr.2023.104027

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Citations (1)

Microbial life under Martian permafrost layer

The Innovation (2024)

Xiuqi Shang Ruifang Huang Weidong Sun

10.1016/j.xinn.2024.100724

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Crustal evolution events in the Chinese continent: evidence from a zircon U-Pb database

International Journal of Digital Earth (2020)

Yujing Wu Xianjun Fang Sisi Liao Lizhi Xue Zhe Chen

The zircon U-Pb chronology database provides a good opportunity to obtain important zircon growth peak periods in the Earth's history so as to study the origin and evolution of the crust. It should be noted that research preference affects the objectivity of zircon sampling, leading to hot data in the database and age statistics. To evaluate the influence of hot data on statistical results, the W and Y indexes are introduced. Using a Gaussian model of multipeak fitting of zircon U-Pb age frequencies, we identify seven major growth peaks in zircons from the Chinese continental crust, which are 2498.95, 1855.82, 828.88, 444.29, 249.46, 131.96, and 58.21 Ma. Due to differences in the time scales of zircon growth peaks, these peaks can be divided into two categories: first-order zircon growth peaks (I) and second-order zircon growth peaks (II), which represent longer and shorter time scales, perhaps due to different kinds of geological dynamics, respectively. In addition, there are clear correspondences between these ages and various geological events recognized by most scholars, namely, the Wutai orogeny, Lvliang orogeny, Jinning orogeny, Caledonian orogeny, Indosinian orogeny, Yanshanian orogeny, and Himalayan orogeny, respectively.

Orogeny

Geochronology

10.1080/17538947.2020.1739152

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Citations (17)

Zircon U-Pb geochronology of the Chinese continental crust: a preliminary analysis of the Elsevier science database

Big Earth Data (2019)

Yujing Wu Xianjun Fang Sisi Liao Lizhi Xue Zhe Chen

Formulae display:?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a formula to zoom.

Geochronology

10.1080/20964471.2019.1576261

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Citations (14)

<italic>In situ</italic> Raman spectroscopic experiments support the sulfate reduction model of porphyry deposits

Chinese Science Bulletin (Chinese Version) (2021)

Weidong Sun Xiuqi Shang

10.1360/tb-2021-0098

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Citations (1)

岩浆海的演化对宜居星球的形成有何意义？

Earth Science-Journal of China University of Geosciences (2022)