Applications of mercury stable isotopes for tracing volcanism in the geologic record  

作　　者：Qing GONG Ming-Xing LING Wang ZHENG 

机构地区：[1]State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China [2]School of Earth System Science,Institute of Surface-Earth System Science,Tianjin University,Tianjin 300072,China

出　　处：《Science China Earth Sciences》2024年第5期1436-1458,共23页中国科学（地球科学英文版）

基　　金：supported by the National Key R&D Program of China(Grant Nos.2023YFC2906601 and 2021YFC2901705);the National Natural Science Foundation of China(Grant No.42173024);the China National Uranium Company-State Key Laboratory of Nuclear Resources and Environment Joint Innovation Fund(Grant No.2022NRE-LH-16);the Jiangxi Double Thousand Plan(Grant No.DHSQT22021005);the Research Foundation of East China University of Technology(Grant No.DHBK2019296)。

摘　　要：Mercury(Hg)enrichments in ancient sediments have been used as a proxy of volcanism,especially large igneous province(LIP)eruptions.However,considering the existence of other potential Hg sources besides volcanoes and the diverse factors(e.g.,organic matters,clay minerals,sulfide minerals and Fe oxides)that can affect Hg sequestration,there are considerable uncertainties to simply regard sedimentary Hg anomalies as signatures of volcanic activities.Mercury stable isotopes,a promising tool for tracing the origins and transformations of Hg,have been increasingly used for determining the causes of Hg spikes and understanding the geochemical behavior of Hg in the geologic record.To date,lots of researches have applied Hg concentrations and Hg isotopes to identify LIP volcanisms linking with significant geological events such as mass extinctions,ocean anoxic events and other environmental perturbations that mainly occurred in the Phanerozoic.However,the results in previous studies clearly show that not all Hg enrichments are derived from volcanic inputs,which emphasize the need for more caution in using Hg as a fingerprint of volcanism.With a better understanding of Hg isotopes in the future,there will be important implications for Hg isotopes to reconstruct volcanic activities in the rock records and their impacts on biological evolution.

关 键 词：Mercury stable isotopes Large igneous province Mass extinction event Ocean anoxic event 

分 类 号：P317[天文地球—固体地球物理学] P597.2[天文地球—地球物理学]