Geochemical Behaviors of Nickel Isotope in Marine Sediments
Ma Jingya
Lü Yiwen
Wang Shuijiong
Abstract：The nickel isotope system serves as a crucial tool for investigating the sources,migration,transformation,and cycling processes of nickel in the ocean.Marine sediments play a vital role in the geochemical cycling of nickel,functioning both as a"source"and a"sink"for the element.The nickel isotopic composition can record key information about the nickel cycling process in seawater.In this paper it systematically summarizes the nickel isotopic compositions of seawater and major marine reservoirs,including riverine inputs,hydrothermal systems,and diverse marine sediments(iron-manganese oxide deposits,anoxic sediments,and carbonate sediments).It analyzes nickel isotopic compositions and their interrelationships,and delves into the fractionation mechanisms of nickel isotopes between sediments and seawater and their implications for reconstructing palaeoceanographic environments.The findings demonstrate that nickel isotope possesses unique advantages in tracing changes in palaeoceanographic productivity,sulfur-rich environmental evolution,and the mass balance of the global nickel cycle.
Keywords：nickelisotopesisotope fractionationmarine geochemical cyclesoceanography
Publication Date：2025-11-30
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：14( 4459-4472 )