海洋铜锌同位素地球化学研究进展  

Advances in the Isotope Geochemistry of Copper and Zinc in Oceans

作　　者：陈璐[1] 孙若愚 刘羿 徐海[1] CHEN Lu;SUN Ruoyu;LIU Yi;XU Hai(School of Earth System Science,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学地球系统科学学院,天津300072

出　　处：《地球科学进展》2021年第6期592-603,共12页Advances in Earth Science

基　　金：国家自然科学基金优秀青年科学基金项目“珊瑚礁地球化学与全球变化”(编号:4192200195)资助。

摘　　要：铜锌是海洋浮游生物生命活动所必需的微量营养元素,其含量和同位素能够对相关海洋生物—物理—化学过程进行示踪和定量分析,是国际地学重大研究计划"GEOTRACES"的核心研究内容之一。总结和评述了近年来海洋铜锌同位素的最新研究成果和研究现状,归纳出以下认识:(1)生物吸收、颗粒物吸附和有机质络合等不同海洋过程会使海水溶解铜锌同位素产生分馏,从而对同位素组成的纵剖面分布特征造成影响;(2)现代海洋主要铜锌输入、输出端元同位素组成及通量的研究已日趋成熟,但仍存在潜在的铜锌源汇尚未被发现;(3)铜锌对海洋气候环境变化极为敏感,其同位素组成经常被广泛应用于古海洋气候环境变化等方面的示踪。未来还需在优化铜同位素组成的分析测试方法、探究海洋铜锌的潜在源汇以及生物碳酸盐等海洋载体铜锌同位素分馏机理等方面开展进一步工作,并有望在碳循环、地球气候重大演变和海洋环境污染的示踪应用等方向取得突破。The research on marine biogeochemical cycles of copper(Cu)and zinc(Zn)and their isotopes is now active due to their roles as essential micronutrients for marine phytoplankton and their use as tracers of various physical,geological,and chemical processes in oceans. Notably,Cu and Zn are selected as key research elements in the international GEOTRACES program. Here,the research achievements and advances of marine Cu and Zn isotopes in recent years are reviewed. This includes:(1) The vertical distribution characteristics of dissolved Cu and Zn isotopic compositions(δ65 Cu and δ66 Zn)in the marine water columns could be influenced by different ocean processes such as biological uptake,particle scavenging and complexation with organic ligands because these processes lead to the fractionation of Cu and Zn isotopes;(2) The research on Cu and Zn isotopic compositions and their influxes and outfluxes of major marine sources and sinks has become more and more mature,but there are still potential sources and sinks of Cu and Zn that have not been found;(3) Cu and Zn are extremely sensitive to changes in marine climate and environment,so Cu and Zn isotopes are often used to trace paleo-ocean climate and environment change. In the future,more studies are suggested to focus on optimizing the analysis methods of Cu isotopic compositions,exploring the potential sources and sinks of modern marine Cu and Zn cycles and Cu and Zn isotope fractionation mechanisms of marine biogenic carbonates. Breakthroughs are expected to be achieved in the applications of Cu and Zn isotopes to tracing carbon cycle,paleoclimate evolutions and marine environmental pollution.

关 键 词：铜同位素 锌同位素 海洋生物地球化学循环 示踪 

分 类 号：P736.4[天文地球—海洋地质]