| 西太平洋Kocebu海山铁锰结壳稀土元素地球化学特征 |
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| 引用本文： | 刘凯,王珍岩.西太平洋Kocebu海山铁锰结壳稀土元素地球化学特征[J].海洋地质与第四纪地质,2021(1):210-222. |
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| 作者姓名： | 刘凯 王珍岩 |
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| 作者单位： | 中国科学院海洋研究所海洋地质与环境重点实验室;中国科学院大学;中国科学院海洋大科学研究中心;青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室 |
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| 基金项目： | 中国科学院战略性先导科技专项“印太交汇区海洋物质能量中心形成演化过程与机制”(XDB42010203);“地球大数据科学工程”(XDA9060401);科技部基础资源调查专项“西太平洋典型海山生态系统科学调查”(2017FY100802)。 |
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| 摘 要： | 西太平洋麦哲伦海山区是全球重要的铁锰结壳资源分布区,具有丰富的稀土元素资源潜力。本文对采自麦哲伦海山区Kocebu海山的11个铁锰结壳表层样(<1 mm)进行稀土元素地球化学研究,探讨其含量特征、成因和影响稀土元素富集的环境因素。结果表明:Kocebu海山铁锰结壳表层样品ΣREY(Rare earth elements and yttrium)平均含量为1366 mg/kg,低于前人在麦哲伦海山区其他海山以及邻近的马尔库斯–威克海山区的分析结果;样品轻稀土富集和Ce正异常(平均值为1.45)特征以及稀土元素成因图解、配分曲线和分配系数曲线等均表明该海山结壳属于水成成因;海水中稀土元素含量和溶解氧含量是控制结壳生长的关键环境参数,二者在Kocebu海山所在海区的浅水环境中含量较低;结壳ΣREY含量偏低与采样点水深较浅导致的海水稀土元素含量和溶解氧含量较低密切相关,受碎屑矿物的稀释作用影响较小。在开展铁锰结壳地球化学特征研究和资源勘探评价时应充分考虑采样水深的分布范围,局部水深样品的分析结果可能导致研究结果出现较大偏差。
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| 关 键 词： | 铁锰结壳 稀土元素 地球化学特征 成因 麦哲伦海山 |
Geochemistry of rare earth elements and yttrium in ferromanganese crusts from Kocebu Guyot in the Western Pacific |
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| LIU Kai,WANG Zhenyan.Geochemistry of rare earth elements and yttrium in ferromanganese crusts from Kocebu Guyot in the Western Pacific[J].Marine Geology & Quaternary Geology,2021(1):210-222. |
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| Authors: | LIU Kai WANG Zhenyan |
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| Institution: | (Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China) |
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| Abstract: | The Magellan Seamounts in the Western Pacific,as an important contract area for ferromanganese crusts exploration,contain high potential of rare earth resources.In this paper,the geochemistry of rare earth elements and yttrium(REY)from 11 top surface ferromanganese crust samples(<1 mm)collected from the Kocebu Guyot were studied.We analyzed the REY composition characteristics and genetic type of the samples and discussed the factors which control the enrichment of REY.The results show that the average REY abundance(ΣREY)of the crusts is 1366 mg/kg,which is lower than that from other seamounts in Magellan Seamounts and Marcus-Wake Seamounts.The Kocebu Guyot is characterized by enriched light REE and high positive Ce anomalies(meanδCe value 1.45).Genetic discrimination diagram,normalized REY plots and REY partition coefficient patterns indicate that all the crusts are hydrogenetic in origin.REY abundance and dissolved oxygen content in seawater should be regarded as primary environmental parameters controlling the growth of crusts.The lower REY abundance in the samples is related to the water depth and affected by lower REY and oxygen content in shallower waters near Kocebu Guyot,but not observably diluted by detrital minerals.Geochemistry research and resource evaluation of ferromanganese crusts in seamount areas should take the influence of water depth into further consideration,the analysis of samples from limited water depth may cause large deviations in the research results. |
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| Keywords: | ferromanganese crusts rare earth elements geochemistry genesis Magellan Seamounts |
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