象山港部分金属元素的百年沉积记录及物源指示意义

发布时间：2018-05-10 05:13

本文选题：金属元素 + 沉积物　；参考：《海洋环境科学》2017年02期

【摘要】：本文利用X荧光光谱仪测定了象山港沉积物柱状样中常量元素Ti、K、Ca、Fe、Mn和微量元素Pb、Rb的含量。通过~(210)Pb定年,分析了象山港近百年来元素的沉积记录变化特征。结合沉积物粒径、有机碳、无机碳、总氮等理化参数,通过计算富集系数和主成分分析,探讨了沉积物中金属元素的物源和环境指示意义。研究结果表明:象山港沉积物中的金属元素Ti、K、Ca、Fe、Mn、Pb、Rb的含量分别为0.45%~0.52%、2.14%~2.58%、2.48%~3.13%、4.54%~5.83%、546×10~(-6)~868×10~(-6)、23×10~(-6)~37×10~(-6)、113×10~(-6)~130×10~(~(-6)),与中国其他近岸海域具有很好的可比性。象山港沉积物中的金属元素Ti、K、Ca、Fe、Mn、Rb主要来源于陆源碎屑物质,没有出现明显的富集;而沉积物中的Pb自1980年以来出现了富集现象,其含量在近年来可能受到了人类活动的影响。金属元素Ti、K、Fe、Mn、Rb、Pb易于在有机质含量丰富的沉积物中赋存,而Ca则以无机碳酸钙的形式赋存于象山港底质中。通过与百年来长江流域夏季降水变化的比较,发现陆源性金属元素的沉积记录异常与历史降水异常年份具有耦合性。
[Abstract]:In this paper, the contents of the main elements, TiOK, CaOFE, mn and the trace element PBN RB in the sediment columnar samples of Xiangshan Port have been determined by using X-ray fluorescence spectrometer. The characteristics of sedimentary records of elements in Xiangshan Port in the last hundred years are analyzed by means of dating. Based on the physical and chemical parameters of sediment particle size, organic carbon, inorganic carbon and total nitrogen, the source and environmental significance of metallic elements in sediments were discussed by calculating enrichment coefficient and principal component analysis. The results show that the contents of the metal element Tikankecai FeMnMnPbCb in the sediments of Xiangshan Port are 0.450.52 = 0.452.142.142.58 and 2.483.134.545.8346 脳 10 ~ (346) ~ 668 脳 10 ~ (10) ~ (-6) ~ (23) 脳 10 ~ (10) ~ (6) A ~ (37 脳 10 ~ (10) ~ (63) ~ (113 脳 10 ~ (10) ~ (130 脳 10 ~ (-1) ~ (6) C ~ (-1), which is comparable with other coastal waters in China. In Xiangshan port sediments, the metal element TiGK, CaFeFeMnRb is mainly derived from terrestrial clastic materials, and there is no obvious enrichment of Pb in sediments since 1980, and its contents may be affected by human activities in recent years. The metal element TiGK ~ (2 +) Fe ~ (2 +) mn ~ (2 +) RB ~ (2 +) Pb is easy to exist in the sediments with rich organic matter content, while Ca is deposited in the sediments of Xiangshan Port in the form of inorganic calcium carbonate. By comparing with the summer precipitation variation in the Yangtze River basin over the past 100 years, it is found that the sedimentary anomalies of the terrestrial metallic elements are coupled with the historical precipitation anomalies.
【作者单位】：国家海洋局第二海洋研究所;中国极地研究中心;浙江省海洋监测预报中心;中国地质大学;
【基金】：海洋公益性行业科研专项(201305043-3,201505008-2) 国家海洋局青年科学基金项目(2013144)
【分类号】：P736.21

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