Journal of Marine Sciences ›› 2024, Vol. 42 ›› Issue (2): 104-112.DOI: 10.3969/j.issn.1001-909X.2024.02.010

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Oxygen isotope constraint on the temperature condition of serpentinization in abyssal peridotites

XU Xucheng1, YU Xing1,2,*, HU Hang1,2, HE Hu1, YU Ya’na1   

  1. 1. Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, MNR, Hangzhou 310012, China
    2. Ocean College, Zhejiang University, Zhoushan 316021, China
  • Received:2023-05-18 Revised:2023-06-25 Online:2024-06-15 Published:2024-08-09
  • Contact: YU Xing

Abstract:

Abyssal peridotite is widely distributed in tectonic environments such as mid-ocean ridges, subduction zones, and continental margins, and typically undergoes subsequent alterations, among which serpentinization is the most significant type. Serpentinization refers to the chemical process wherein ferromagnesium-rich minerals in peridotite, such as olivine and pyroxene, are replaced by a series of secondary minerals like serpentine, magnetite, and brucite. The conditions of serpentinization are closely linked with hydrothermal circulation and the migration of mineral-forming substances, bearing significant implications for indicating hydrothermal mineralization. Traditional methods of petrology and geochemistry exhibit polysemic interpretations and uncertainties when reflecting serpentinization conditions, with different minerals or chemical indicators possibly suggesting different outcomes. Oxygen isotopes are ubiquitous in nature and the oxygen isotope tracing method, due to its wide applicability, ease of comparison, and support for in-situ micro-zone analysis, can clearly reflect the reaction conditions and processes of the mineral or rock-fluid system. This study primarily provides an overview of the principles of oxygen isotope thermometry, the process of abyssal peridotite serpentinization, application cases of oxygen isotope thermometry in the serpentinization of abyssal peridotite, factors influencing the oxygen isotope compositions of serpentinites, as well as the advantages and limitations of oxygen isotope thermometry. It aims to offer a reference for a more profound understanding of the serpentinization process of abyssal peridotite.

Key words: abyssal peridotites, serpentinization, water-rock interaction, oxygen isotope, temperature

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