| 长江口东南泥质区百年来稀土元素的组成及控制因素 |
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| 引用本文： | 冯旭文,石学法,黄永祥,许冬,章伟艳,张富元.长江口东南泥质区百年来稀土元素的组成及控制因素[J].地球化学,2011(5):464-472. |
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| 作者姓名： | 冯旭文 石学法 黄永祥 许冬 章伟艳 张富元 |
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| 作者单位： | [1]国家海洋局第二海洋研究所,浙江杭州310012 [2]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,山东青岛266061 [3]金华广播电视大学理工学院,浙江金华321022 [4]国家海洋局第二海洋研究所海底科学国家海洋局重点实验室,浙江杭州310012 |
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| 基金项目： | 国家自然科学基金（41076036）; “我国近海海洋综合调查与评价”专项（908-02-02-05）; 浙江省自然科学基金（Y506287, Y5110171） |
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| 摘 要： | 在210pb定年的基础上,分析了长江口外东南泥质区柱样沉积物稀土元素含量、特征参数分布特征及其与粒径、常量元素等的相关性,探讨了150 a以来稀土元素的来源、制约因素及对沉积环境的响应.结果表明,柱样稀土元素总量(ΣREE)变化范围不大,分布范围为158.38～197.87 μg/g,平均值为183.49μg/g,总体...
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| 关 键 词： | 稀土元素 沉积柱样 长江口 |
Distributions and main controlling factors of rare earth elements in core sediments from the Changjiang Estuary mud area over the last 100 years |
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| FENG Xu-wen,SHI Xue-fa,HUANG Yong-xiang,XU Dong,ZHANG Wei-yan,ZHANG Fu-yuan.Distributions and main controlling factors of rare earth elements in core sediments from the Changjiang Estuary mud area over the last 100 years[J].Geochimica,2011(5):464-472. |
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| Authors: | FENG Xu-wen SHI Xue-fa HUANG Yong-xiang XU Dong ZHANG Wei-yan ZHANG Fu-yuan |
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| Institution: | 1. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;2. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration,Qingdao 266061, China;3. Institute of Science and Technology, Jinhua Radio and Television University, Jinhua 321022, China;4. Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012,China) |
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| Abstract: | One drillcore collected from the Changjiang Estuary mud area was selected for this study. The grain size,rare earth elements （REE） and major elements were determined on the 210Pb-dated sediment core. The sediment REE provenance, main controlling factors and the responding to the sedimentary environment over the last 150 years were discussed. The total content of rare earth element （ΣREE） varies between 158.38 μg/g and 197.87 μg/g,in average of 183.49 μg/g, increasing upwards along the core. The ΣLREE/ΣHREE ratio remains relatively constant with an average of 7.90. Chondrite-normalized REE distribution patterns of samples from different depth remain the same and show riverine sediment characteristics, i.e. negative slope, the enrichment of LREE and weak depletion of HREE. The results indicate that the REE of core sediment mainly came from weathered materials of the Changjiang River and conserved the REE patterns of provenance. REE negatively correlates with Ti, Al, Fe without obvious correlation with grain sizes. Heavy minerals exert important influence on REE composition. The biogenic sedimentary matter might dilute the REE concentration of the sediment. δCe ranges between 0.94 and 1.01, decreasing slightly upwards, with an average of 0.96, showing weak negative Ce anomaly. δEu is fairly constant with obvious negative Eu anomaly, varying between 0.67 and 0.69, with an average of 0.69. The decreasing trend of δCe distribution over the last 150 years may be related to the progressive hypoxia and high productivity in the Changjiang Estuary. |
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| Keywords: | rare earth elements （REE） sediment core Changjiang Estuary |
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