摘要
分析了太湖北部柱状沉积物微量元素含量,以深层沉积物作背景样品,揭示了重金属垂向变化特征及指示意义。中深层沉积物中重金属Pb、Cu、Ni、Cr与Li呈显著正相关,反映了沉积物来源为流域基岩风化产物;表层沉积物中重金属Cu、Ni、Cr与有机碳具有良好正相关性,表明了沉积物受近年来环湖工农业活动影响。中深层沉积物与流域基岩在稀土特征上表现出亲源性;而表层沉积物稀土特征反映了人类活动的影响。
Contents of main trace elements were analyzed for core samples from the northern Taihu Lake. Based on the background levels derived from the lower layer of the sediment samples, the authors managed to show the vertical distribution characteristics of heavy metals and their indicative significance for environmental changes. The heavy metals (Ni, Cr, Cu, Pb) in the subsurface show a significant positive relation with lithium, suggesting that heavy metals are present as a result of chemical leaching of bedrocks in the catchments. The distinct positive relations between Ni, Cr, Cu and organic carbon in the surface sediments imply that heavy metals are influenced by industrial and agricultural activities over the last few decades. The geochemical characteristics of the subsurface sediments are similar to those of bedrocks in the catchments, indicating that the subsurface sediments have the same material source as the bedrocks. And the geochemical characteristics of the surface sediments reflect the impact of anthropogenic activities.
出处
《海洋地质动态》
2005年第8期1-5,共5页
Marine Geology Letters
基金
国土资源部中国地质调查局与江苏省人民政府合作的"江苏省国土生态地球化学调查"项目(200312300008)
关键词
微量元素
稀土元素
沉积物
垂直分布
太湖
trace element
rare earth element
sediment
vertical distribution
the Taihu Lake
