Depth profiling of arsenian pyrite in Carlin-type ores through wet chemistry

作     者：Meizhi Yang Quan Wan Xin Nie Suxing Luo Yuhong Fu Ping Zeng Wenqi Luo Meizhi Yang;Quan Wan;Xin Nie;Suxing Luo;Yuhong Fu;Ping Zeng;Wenqi Luo

作者机构：State Key Laboratory of Ore Deposit GeochemistryInstitute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Comparative PlanetologyHefei 230026China Department of Chemistry and Chemical EngineeringZunyi Normal CollegeZunyi 563006China School of Geographic and Environmental SciencesGuizhou Normal UniversityGuiyang 550001China 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2023年第42卷第2期

页      面：256-265页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Financial supports from the B-type Strategic Priority Program of the Chinese Academy of Sciences(Grant No.XDB41000000) the National Natural Science Foundation of China(41872046,41902041 and 41173074) the Natural Science Research Project of Education Department of Guizhou Province(No.KY004)are sincerely acknowledged 

主　　题：Wet chemistry Acid etching Depth profiling Carlin-type gold deposits Arsenian pyrite 

摘      要：Enrichment of As and Au at the overgrowth rims of arsenian pyrite is a distinctive feature of Carlin-type gold *** distribution of such key elements in high resolution is of fundamental importance yet often proves *** this study,repeated non-oxidative acid etching of ore samples from Shuiyindong gold deposit was applied to enable elemental depth profiling of goldbearing arsenian pyrite ***-OES and AAS were used to determine the dissolved Fe,As,and Au concentrations in each of the etching solutions,and XPS was carried out to exam the etched mineral *** contrast to conventional ion beam etching that may cause substantial sample damage,our acid etching method does not seem to significantly alter the composition and chemical state of the *** etched depths directly converted from the measured elemental concentrations can reproducibly reach a very high resolution of~1 nm,and can be conveniently controlled through varying the etching *** the Fe and As depth profiles consistently reflect the surface oxidation property of arsenian pyrite,the Au profile displaying an obvious upward trend reveals the ore fluid evolution at the late stage of *** on our experimental results,we demonstrate that our wet chemistry method is capable of effective depth profiling of gold ore and perhaps other geological samples,with advantages surpassing many instrumental techniques including negligible sample damage,nanoscale resolution as well as isotropic etching.