| 引用本文: | 贾丽敏,陈秀玲,杨一博,李金婵.2014.伊犁盆地昭苏黄土不同粒径和相态稀土元素特征及其物源指示意义[J].地球环境学报,(2):93-101 |
| JIA Li-Min,CHEN Xiu-ling,YANG Yi-bo,LI Jin-chan.2014.Rare earth elements characteristics in different grain sizes and phases of Zhaosu loess in Yili Basin and their provenance implications[J].Journal of Earth Environment,(2):93-101 |
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| 摘要: |
| 为了探讨伊犁盆地风成沉积物质来源特征，对伊犁地区昭苏黄土剖面代表性样品各个
粒级全岩、酸溶组分和残渣组分中的稀土元素进行了分析。结果表明，各个粒级组分全岩样品
的稀土总量（ΣREE）的变化范围为114.61~178.37 μg·g−1，剖面中各个粒级组分稀土球粒陨石标
准化配分模式呈轻稀土富集，存在明显的Eu 负异常，Ce 无明显异常。各个粒级组分酸溶残渣
稀土特征与上述全岩特征类似。酸溶组分稀土的上部大陆地壳标准化呈现稳定的中稀土富集。
随着各组分粒级变粗，酸溶组分稀土占全岩比例呈现先降低后升高的趋势，即从<2 μm 组分到
16 ~32 μm 组分比例渐次降低，而后从16 ~32 μm 组分到>63 μm 渐次升高，这主要反映了以西风
为代表的远源输送体系和以近地面风为代表的近源输送体系下两种来源的碎屑碳酸盐稀土的混
合。本文不同粒径和赋存形态下稀土元素的特征表明了利用风成沉积物稀土元素反映源区物质
特征存在一定复杂性。 |
| 关键词: 黄土 稀土元素 物质来源 伊犁盆地 |
| DOI：10.7515/JEE201402006 |
| CSTR： |
| 分类号:P595 |
基金项目:国家自然科学基金项目(41302149，41172166)；黄土与第四纪地质国家重点实验室开放基金(SKLLQG1103，
SKLLQG1113)；中国科学院科技创新“ 交叉与合作团队” 项目；福建省科技计划项目公益类项目(K3-296)
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| Rare earth elements characteristics in different grain sizes and phases of Zhaosu loess in Yili Basin and their provenance implications |
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JIA Li-Min1, 2, CHEN Xiu-ling1, 2, YANG Yi-bo1, 2, LI Jin-chan1, 2
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1. Key Laboratory for Subtropical Mountain Ecology ( Ministry of Science and Technology and Fujian Province Funded ), School
of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China; 2. State Key Laboratory of Loess and Quaternary
Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; 3. Key Laboratory of Continental
Collision and Plateau uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
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| Abstract: |
| In order to explore the provenance of aeolian deposits in Yili Basin, rare earth elements
(REE) concentrations in three phases of whole-rock, acid soluble, and acid residue in each grain size
fractions of seven representative samples in Zhaosu loess section are analyzed. Whole rock ΣREE in
each grain size fractions range from 114.61~178.37 μg·g-1, showing light REE enriched chondritenormalized
patterns with distinct negative Eu anomaly and undetectable Ce anomaly. REE characteristic
of acid residues in each grain size fractions resemble those of whole rock phase. Upper continental
crust normalized REE concentrations of acid soluble phase showed observed middle REE enriched.
Along with increasing grain sizes, the proportions of acid soluble phase in whole rock display initial
decreasing and then increasing variations. More specific, those proportions decreased from <2 μm to
16~32 μm fractions, then increased from 16 ~ 32 μm to >63 μm fractions, which are the mixing resultsof REE in detrital carbonate derived from distant source transported by the westerly and adjacent source transported by the near-surface wind. The REE characteristic in different grain size and phase exhibits
the complexity of using REE in aeolian deposits to trace provenance change. |
| Key words: loess rare earth elements provenance Yili Basin |
