Rare earth elements in the ornithogenic sediments from the Maritime Antarctic: A potential new palaeoecology proxy
Rare earth elements in the ornithogenic sediments from the Maritime Antarctic: A potential new palaeoecology proxy
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南极海洋鸟类沉积物中的稀土元素：一个潜在的新古生态学代理
DOI：
10.2343/geochemj.1.0087
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发表时间：
2011-02
影响因子：
0.8
通讯作者：
Li, Dan
中科院分区：
文献类型：
--
作者：
Liu, Xiaodong;Sun, Liguang;Wang, Yuhong;Li, Dan
南极海洋鸟源沉积物是研究历史企鹅种群变化的良好档案。本文分析了受企鹅粪便影响的两个湖相沉积物芯（Y2和Y4）中稀土元素、生物元素和亲石元素的含量，以评价其作为新的古生态指标的潜力。两种岩心中稀土元素的相对含量变化较大，Y2和Y4的平均稀土元素含量分别为71.21±11.56 （n = 37）和37.18±10.64 （n = 18）。Y2和Y4的稀土轻/重含量比（L/H）分别为4.48±0.59和4.70±0.62，与4个纯鸟粪样品的平均比值非常接近。受企鹅粪便影响较大的Y2和Y4沉积物球粒陨石归一化稀土模式具有分异特征，明显的负Ce异常和正Er异常，可能印刻了鸟粪输入的稀土信号。总REE浓度与鸟粪源生物元素含量呈显著负相关，与主要来源于风化土壤的Sc和Al含量呈显著正相关。基于二元混合方程计算的鸟粪源稀土元素比例的变化规律与之前根据沉积物中生物元素浓度重建的企鹅历史种群规模的变化规律一致。这些结果表明，鸟源沉积物中稀土元素的非地壳特征可以为大时间尺度上研究南极企鹅的古生态过程提供新的古生态指标。
The ornithogenic sediments in the maritime Antarctic are good archives for studying the changes of historical penguin population. Rare earth elements (REEs) along with biological and lithophile elements in two lacustrine sediment cores (Y2 and Y4) influenced by penguin droppings were analyzed with the aim of evaluating their potential as a new palaeoecological proxy. The relative concentrations of REEs in the two cores show dramatic changes, and the average REE contents are 71.21 ± 11.56 (n = 37) and 37.18 ± 10.64 (n = 18) for Y2 and Y4, respectively. The REE light/heavy content ratios (L/H) are 4.48 ± 0.59 for Y2 and 4.70 ± 0.62 for Y4, very close to the mean ratio of four pure guano samples. The chondrite-normalized REE patterns in the Y2 and Y4 sediments significantly influenced by penguin droppings are characteristic of more fractionation, obviously negative Ce anomalies and positive Er anomalies, likely imprinting the REE signal of guano input. The total REE concentration has a statistically significant negative correlation with the levels of guano-derived bio-elements and a positive correlation with the levels of Sc and Al mainly originated from weathered soils. The calculated proportion of guano-derived REE based on two-member mixing equation has a change pattern consistent with that of the historical penguin population size, previously reconstructed from bio-element concentrations in the sediments. These results suggest that the non-crustal signature of REE in the ornithogenic sediments may provide a new palaeoecological proxy for studying the palaeoecological processes of Antarctic penguins on a large time scale.
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影响因子：
2.6
作者：
Ramachandran Ramesh;Al. Ramanathan;R. A. James;V. Subramanian;S. Jacobsen;H. Holland
通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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