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《Journal of the Chinese Rare Earth Society》 2010-04
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Controlling Factors on Enrichment of Cerium in Co-Rich Fe-Mn Crusts from Magellan Seamount Cluster

Ren Xiangwen1,2,Shi Xuefa1,Zhu Aimei1,Liu Jihua1,Fang Xisheng1(1.Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;2.Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China)  
A Co-rich Fe-Mn crust MKD23B-3 was dredged from Seamount MK of Magellan Seamount cluster at a water depth of about 2170 m,and the Ce,Co and P2O5 contents along the section of this sample were analyzed by means of ICP-OES and ICP-MS.The results exhibited that,in non-phosphatized crust layer,the excess Ce(Cexs) correlated positively with Co content and correlation coefficient R2 was as high as 0.7893,however,correlated negatively with growth rate and correlation coefficient R2 was as high as 0.7211,which suggested that growth rate was the predominant factor controlling the Ce content in this Co-rich Fe-Mn crust,and high Ce content was resulted from low growth rate.If the pH and Mn2+ content in seawater were constant during the growth of this sample,the growth rate of Fe-Mn crusts correlates positively with the depositional flux of Fe and Mn,and the depositional flux of Fe and Mn correlates positively with the dissolved oxygen in seawater.Based on above analysis,it could be concluded that,in case of the constant pH and Mn2+ content,Cexs correlated negatively with the dissolved oxygen in seawater,and the dissolved oxygen in seawater was an indirect controlling factor for the content of Ce in Fe-Mn crusts.This essay corrected the former conclusion that "the high Ce anomaly indicates the low dissolved oxygen content in seawater out of which Fe-Mn crusts deposited".
【Fund】: 科技部国际科技合作重大项目(2006DFB21620);; 国家自然科学基金项目(40806027);; 国际海底区域研究开发“十一五”课题(DYXM-115-01-2-1 DYXM-115-01-2-7);; 国家海洋局第一海洋研究所基本科研业务费专项资金项目(2008T03 GY02-2009G23);; “泰山学者”建设工程专项经费资助
【CateGory Index】: P618.7
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