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稀土元素作为示踪标记在海洋沉积动力学中应用前景的初步探讨

, PP. 67-82

Keywords: 稀土元素,示踪标记,东海陆架,沉积物输运

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Abstract:

根据对长江等5条河流和东海陆架区总计146个沉积物样品的稀土元素和粒度分析结果,借助统计学方法,讨论了河流和东海近岸沉积物稀土元素分布格局的形成因素及其对沉积动力作用的响应,结果表明,各河流沉积物在稀土元素总量和轻重稀土分异等参数上有差异;在长江口沉积物中稀土元素在小于2和2~31μm粒级中较富集,全岩稀土元素含量受物质组成占优的粒级控制;在东海陆架研究区稀土元素含量由岸向海有减小的趋势,在河口附近相对较高,轻重稀土分异自28°N向南有增大的趋势。

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