Research Progress and Applications of High-Temperature Barium Isotope Geochemistry
Wu Fei
Zhou Laitong
Feng Liang
Nan Xiaoyun
Abstract：Significant advances have been made in the geochemical study of barium(Ba)isotopes over the past decades,demonstrating considerable potential for their application in tracing crust-mantle interactions,crust recycling in subduction zones,granite differentiation,magmatic-hydrothermal fluids and mineralization processes,as well as marine productivity.This paper systematically reviews the current progress in Ba isotope studies related to high-temperature geological processes.Recent research has preliminarily established the range of Ba isotope variations in different geological reservoirs,revealing distinct Ba isotopic compositions between crustal materials of various origins(such as sediments and altered oceanic crust)and the depleted mantle.Theoretical calculations,experimental studies,and observations from geological samples indicate that Ba isotope fractionation among Ba-bearing minerals is limited under high-temperature equilibrium conditions.However,processes such as dehydration of hydrous minerals during metamorphism,exsolution of magmatic-hydrothermal fluids,and fluid-rock interactions can lead to significant Ba isotope fractionation.Finally,this paper presents research progress and case studies on the use of Ba isotopes to investigate crustal-material recycling,granite evolution,and mineralization,highlighting the application potential of Ba isotope in tracing high-temperature geological processes.
Keywords：Ba isotopenon-traditional stable isotopegeochemical tracingisotope fractionationgeochemistry
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：21( 2461-2481 )