The occurrence phases and enrichment mechanism of rare earth elements in cobalt-rich crusts from Marcus-Wake Seamounts

作     者：Jingjing Gao Jihua Liu Hui Zhang Shijuan Yan Xiangwen Ren Quanshu Yan Jingjing Gao;Jihua Liu;Hui Zhang;Shijuan Yan;Xiangwen Ren;Quanshu Yan

作者机构：Key Laboratory of Marine Geology and MetallogenyFirst Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine GeologyLaoshan LaboratoryQingdao 266237China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2024年第43卷第8期

页      面：58-68页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The fund of Laoshan Laboratory under contract Nos LSKJ202203602 and LSKJ202204103 the China Ocean Mineral Resource Research and Development Association Research Program under contract No.DY135-C1-1-04 the Taishan Scholarship from Shandong Province 

主　　题：cobalt-rich crusts REEs occurrence phase enrichment mechanism Marcus-Wake Seamounts 

摘      要：To explore the occurrence phases and enrichment mechanism of rare earth elements(REEs)in cobalt-rich crusts,this study analyzes the mineral composition and REE contents of the samples from Marcus-Wake Seamounts by XRD,ICP-OES and *** results show that,(1)the cobalt-rich crusts contain the major crystalline mineral(vernadite),the secondary minerals(quartz,plagioclase and carbonate fluorapatite),and a large amount of amorphous ferric oxyhydroxides(FeOOH).(2)The cobalt-rich crusts contains higher Mn(10.83%to 28.76%)and Fe(6.14%to 18.86%)relative to other elements,and are enriched in REEs,with total REE contents of 1563−3238μg/g and Ce contents of 790−1722μg/*** earth element contents of the old crusts are higher than those of the new ***,the non-phosphatized crusts have positive Ce and negative Y anomalies,and yet the phosphatized crusts have positive Ce and positive Y anomalies,indicating that cobalt-rich crusts is hydrogenetic and REEs mainly come from seawater.(3)Analytical data also show that the occurrence phases of elements in cobalt-rich crusts are closely related to their mineral *** the non-phosphatized crusts,REEs are adsorbed by colloidal particles into the crusts(about 67%of REEs in the Fe oxide phase,and about 17%of REEs in the Mn oxide phase).In contrast,in the phosphatized crusts(affected by the phosphatization),REEs may combine with phosphate to form rare earth phosphate minerals,and about 64%of REEs are enriched in the residual phase containing carbonate fluorapatite,but correspondingly the influence of Fe and Mn oxide phases on REEs enrichment is greatly *** addition,the oxidizing environment of seawater,high marine productivity,phosphatization,and slow growth rate can promote the REE *** study provides a reference for the metallogenesis of cobalt-rich crusts in the Pacific.