| 东海内陆架泥质区表层沉积物稀土元素的分布特征 |
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| 引用本文： | 朱爱美,刘季花,张辉,白亚之,崔菁菁,刘升发.东海内陆架泥质区表层沉积物稀土元素的分布特征[J].海洋地质与第四纪地质,2012(1):1-10. |
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| 作者姓名： | 朱爱美 刘季花 张辉 白亚之 崔菁菁 刘升发 |
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| 作者单位： | 国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室 |
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| 基金项目： | 我国近海海洋综合调查与评价专项(908-01-CJ12;908-02-05;908-ZC-1-05) |
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| 摘 要： | 通过对东海内陆架泥质区30个表层沉积物样品中的稀土元素、主微量元素、TOC、CaCO3、沉积物粒度进行了分析,讨论了影响稀土元素分布的原因。结果显示东海内陆架中ΣREEs为182.8～221μg/g,均值为206.5μg/g,明显高于黄土、黄河及雅鲁藏布江中稀土元素的含量,与长江、瓯江中稀土元素含量接近。稀土元素的球粒陨石标准化配分模式及(La/Yb)N比值显示,轻稀土显著富集,存在显著的δEu异常。稀土元素上地壳标准化配分模式显示稀土元素与上地壳之间不存在显著的分馏,稀土元素存在显著的"四分性"。稀土元素与粒径、有机质、CaCO3之间不存在相关性,表明研究区中稀土元素含量不受上述3个因素的控制。元素比值及稀土元素上地壳标准化配分模式显示研究区稀土元素主要源于长江。
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| 关 键 词： | 稀土元素 表层沉积物 内陆架泥质区 东海 |
DISTRIBUTION PATTERN OF REES IN THE INNER-SHELF MUD AREA OF EAST CHINA SEA |
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| ZHU Aimei,LIU Jihua,ZHANG Hui,BAI Yazhi,CUI Jingjing,LIU Shengfa.DISTRIBUTION PATTERN OF REES IN THE INNER-SHELF MUD AREA OF EAST CHINA SEA[J].Marine Geology & Quaternary Geology,2012(1):1-10. |
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| Authors: | ZHU Aimei LIU Jihua ZHANG Hui BAI Yazhi CUI Jingjing LIU Shengfa |
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| Institution: | (First Institute of Oceanography,State Oceanic Administration,Key Laboratory of Marine Sedimentology and Environmental Geology,State Oceanic Administration,Qingdao,266061) |
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| Abstract: | Thirty surface samples were collected from the inner-shelf mud areas of the East China Sea.The compositions of rare earth element(REEs),major and minor elements,TOC,CaCO3 and grain size were analyzed for bulk samples.With the results,we discussed in this paper the factors controlling the distribution of the REEs.Results show that the contents of ΣREEs in the inner shelf mud deposits of the East China Sea range from 182.8 ~ 221 μg/g with an average of 206.5 μg/g,significantly higher than that in the loess,Yellow River and Yarlung Tsangbo River sediments,but similar to that of the Yangtze River and Oujiang River sediments.Chondrite-normalized REE patterns and(La/Yb)N ratios show that light REE(LREE) are enriched relative to heavy REE(HREE) in sediments with a very strong negative δEu value.Upper continental curst-normalized REE patterns show that the REE of the mud deposits have little fractionation with the UCC and a tetrad pattern of REE were observed in the mud sediments.The weak correlation between REEs and grain size,TOC,CaCO3 indicate that those factors are not critical to the distribution of REEs.The elements ratios and the UCC-normalized pattern of REE suggest that the sediments in the study area are mainly from the Yangtze and Oujiang Rivers. |
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| Keywords: | rare earth elemetns surface sediments the inner shelf mud areas the East China Sea |
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