Minor element variations during the past 1300 years in the varved sediments of Lake Xiaolongwan, north-eastern China
Minor element variations during the past 1300 years in the varved sediments of Lake Xiaolongwan, north-eastern China
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DOI：
10.1080/11035897.2013.788550
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发表时间：
2013-11
期刊：
影响因子：
1
通讯作者：
G. Chu;Qing Sun;Shengqiang Li;Yuan Lin;Xiaohua Wang;M. Xie;Wenyu Shang;Aiguo Li;Ke Yang
中科院分区：
文献类型：
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作者：
G. Chu;Qing Sun;Shengqiang Li;Yuan Lin;Xiaohua Wang;M. Xie;Wenyu Shang;Aiguo Li;Ke Yang
同步辐射X射线荧光测量提供了元素的无损原位分析。本文介绍了一个小龙湾湖纹状沉积物中1300年来高分辨率微量元素数据集。近1300年来，湖泊沉积物中Rb、Sr、Ti、Zn、As、Fe等成岩元素的变化具有明显的年代际-百年变化特征。中世纪温暖期的成岩元素值较低。小冰期可能是物理风化作用较强、成岩元素含量较高的时期。我们的地球化学数据集的主成分分析表明，高Rb/Sr比和Zr丰度的沉积物，可能与化学风化过程和灰尘输入之间的联系。生物溴（因子-3）的变化表现出类似的模式，在韩国的十年干旱指数。潮湿的条件有利于溴在湖泊沉积物中的积累，因为高降水量可能会从森林土壤中运输更多的溴，并增加湖泊中浮游生物的产量。因子3的谱分析结果表明，近1400年来的降水变化具有显著的2.6、3.5、53-55、87-89和105-110年的周期性，这表明近1400年来的降水变化可能与厄尔尼诺-南方涛动和太阳活动有关。
Synchrotron radiation X-ray fluorescence measurement provides a nondestructive in situ analysis of elements. We present a high-resolution minor element dataset covering the past 1300 years from the varved sediments in Lake Xiaolongwan. The variations of lithogenic elements (Rb, Sr, Ti, Zn, As and Fe) in the lake sediment show distinct decadal to centennial features during the past 1300 years. The Medieval Warm Period has a low value of lithogenic elements. In contrast, the Little Ice Age may be a period with stronger physical weathering and a higher value of lithogenic elements. Principal components analysis of our geochemical dataset suggests a link between high Rb/Sr ratio and Zr abundance in the sediment that could be related with both chemical weathering process and dust input. The variations of biogenic bromine (factor-3) show a pattern similar to the decadal drought index in Korea. Wet conditions favor bromine accumulation in lake sediment because high precipitation may transport more bromine from forest soil and increase plankton production in the lake. Spectral analysis of factor-3 yields notable periodicities of 2.6, 3.5, 53–55, 87–89 and 105–110 years, implying that precipitation variability for the past 1400 years could be associated with El Niño–Southern Oscillation and solar activity.