地球科学进展 ›› 2025, Vol. 40 ›› Issue (6): 621 -634. doi: 10.11867/j.issn.1001-8166.2025.036

综述与评述 上一篇    下一篇

钡及其同位素地球化学循环与分馏机制进展
贾凡琛(), 李茜, 朱光有(), 陈思钰, 黄月, 蓝婉嫣, 王瑞林, 王嘉宁   
  1. 长江大学 地球科学学院,湖北 武汉 430100
  • 收稿日期:2025-01-23 修回日期:2025-04-01 出版日期:2025-06-10
  • 通讯作者: 朱光有

Advances in Geochemical Cycles and Fractionation Mechanisms of Barium and Its Isotopes

Fanchen JIA(), Xi LI, Guangyou ZHU(), Siyu CHEN, Yue HUANG, Wanyan LAN, Ruilin WANG, Jianing WANG   

  1. School of Geosciences, Yangtze University, Wuhan 430100, China
  • Received:2025-01-23 Revised:2025-04-01 Online:2025-06-10 Published:2025-08-04
  • Contact: Guangyou ZHU
  • Supported by:
    the National Natural Science Foundation of China(42230812)

在海洋地球化学领域,钡及其同位素在沉积物中保存率高且同位素分馏稳定,已成为古生产力重建的重要示踪剂。通过整合高精度同位素分析数据,阐述了海洋钡的源和汇,揭示陆源、热液和生物输入的协同驱动作用。研究发现在矿物—流体—熔体分馏体系中,平衡与动力学分馏机制的交互作用是钡同位素分馏的核心驱动力。而区域分馏的差异表明,海洋钡同位素分馏是多因素协同作用的结果,其空间异质性为示踪古海洋环境演变提供了关键依据。未来需结合原位微区技术深化生物—矿物—流体交互机制研究,提升古海洋环境重建精度。

In the intricate domain of marine geochemistry, barium (Ba) and its isotopes emerge as pivotal elements. Their remarkably high preservation rate in marine sediments allows them to withstand post-depositional alterations, making them ideal proxies for long-term geological records. The stable isotope fractionation behavior of barium serves as a powerful tool for reconstructing paleoproductivity with high precision. In this study, we meticulously compiled high-precision isotope analysis data from various sources, including a comprehensive review of existing literature and in-house experimental results. We then conducted an in-depth investigation into the sources and sinks of marine barium. Our findings demonstrate that terrigenous, hydrothermal, and biological inputs are not isolated contributors, but instead interact synergistically to drive the cycling of barium in the ocean. Regarding Ba isotope fractionation, within the mineral-fluid-melt system, we found that the dynamic interplay between equilibrium and kinetic fractionation mechanisms is of critical importance. Equilibrium fractionation, governed by quantum mechanical differences in bond vibrations, and kinetic fractionation, associated with non-equilibrium processes such as diffusion, jointly shape the isotopic composition of marine barium. Observed regional variations in isotope fractionation further suggest that multiple factors, including temperature, pressure, and the presence of various chemical species, jointly influence marine Ba isotope behavior. This spatial heterogeneity provides a valuable framework for tracing the evolution of the paleo-oceanic environment and reconstructing historical changes in oceanic conditions. Looking ahead, the integration of in-situ micro-area analytical techniques is not merely desirable but essential. These advanced methods will enable detailed investigations at the microscale, enhancing our understanding of the interactions among biological, mineral, and fluid components in marine systems. Ultimately, such insights will improve the accuracy of paleo-oceanic reconstructions and contribute to a more comprehensive understanding of Earth’s past oceanic ecosystems.

中图分类号: 

图1 地球上钡库含量分布(数据引自参考文献[1-29-1014-17])
Fig. 1 Barium contents in reservoirs on the Earthdata are cited from references1-29-1014-17])
表1 钡同位素原子质量及丰度21
Table 1 Atomic masses and abundances of barium isotopes21
图2 不同储库的钡同位素组成(据参考文献[22-23]修改,数据来自参考文献[912-131922-28])
Fig. 2 Isotope compositions of barium in different reservoirsmodified after references22-23], data from references912-131922-28])
图3 海水剖面的溶解态钡(DBa)和δ138/134BaDBa 镜像分布(数据来自参考文献[9-1029-31])
Fig. 3 Mirror distribution of DBa and δ138/134BaDBa in the seawater profiledata are cited from references9-1029-31])
图4 海洋钡循环示意图
Fig. 4 Schematic diagram of the ocean barium cycle
表2 钡来源及通量情况
Table 2 Flux situation of barium sources
表3 重晶石成因分类与环境、鉴定特征汇总(据参考文献[141]修改)
Table 3 Summary of the genetic classificationenvironmentsand identification characteristics of baritemodified after references141])
图5 重晶石颗粒轨迹循环图(据参考文献[1-2111341]修改) 括号中数据为钡通量,单位nmol/(cm2·a)
Fig. 5 Circulation diagram of barite particle trajectoriesmodified after references1-2111341]) Barium flux data in parentheses, units: nmol/(cm²·a)
图6 生物驱动作用示意图
Fig. 6 Schematic diagram of the barium isotope fractionation mechanism under biological action
表4 古生产力重建方法及局限性分析
Table 4 Methods and limitations analysis of paleoproductivity reconstruction
表5 微观分馏机制汇总
Table 5 Summary of microscopic fractionation mechanisms
图7 俯冲带中钡同位素行为(据参考文献[89]修改)
Fig. 7 Behavior of barium isotopes in subduction zonesmodified after reference89])
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