马来半岛彭亨河和吉兰丹河沉积物稀土元素特征及其物源示踪
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摘要
通过对马来半岛东部彭亨河28个站位和吉兰丹河22个站位表层沉积物进行稀土元素(REE)测试,对比分析了稀土元素的组成特征和分布规律,探讨了稀土元素组成的控制因素和物源示踪意义。结果表明,彭亨河沉积物稀土元素含量介于24.88～304.29μg/g之间,平均含量为165.22μg/g,吉兰丹河沉积物中稀土元素含量介于126.02～281.40μg/g之间,平均值为181.15μg/g。彭亨河大部分沉积物上陆壳(UCC)标准化模式为重稀土相对轻稀土富集,吉兰丹河沉积物轻重稀土无明显分异。沉积物源岩和矿物组成对两条河流的REE组成起到了重要的控制作用,化学风化对彭亨河REE组成的影响大于吉兰丹河,而彭亨河沉积物粒度组成显著差异也导致了其REE含量变化范围更大。δEu UCC-(Gd/Yb)UCC关系图中彭亨河和吉兰丹河沉积物分区明显,表明其可作为定性判别两条河流来源的有效指标,并可用于海区沉积物来源的示踪和定量识别。
Rare earth element(REE) in the surface sediments from Pahang River(28 samples) and Kelantan River(22 samples) in the eastern portion of Malay Peninsula are analyzed to decipher the characteristics of REE composition and distribution,to discern the controlling factors of REE composition,and to illustrate the significances of provenance tracing of REE.The results show that the total REE ranges from 24.88 μg/g to 304.29 μg/g,with an average of 165.22 μg/g,for the Pahang River;and 126.02 μg/g to 281.40 μg/g,with an average of 181.15 μg/g,for the Kelantan River,respectively.The UCC standardization of REE indicates that Pahang River sediments enrich with heavy rare earth elements,in relative to light rare earth elements.However,there is no significant difference between light and heavy rare earth elements in the Kelantan River.The composition of source rocks and minerals plays a controlling role in the REE composition of the two rivers.The influence of chemical weathering in the Pahang River is greater than Kelantan River,and the difference of grain size among the Pahang River sediments leads to larger REE variations.δEu UCC-(Gd/Yb)UCC discrimination diagram demonstrates that it can be used as an effective index to qualitatively seperate the sediment source of two rivers.It can further be used to trace and identify the source of sediments quantitatively on the continental shelf of Malay Peninsula.
Rare earth element(REE) in the surface sediments from Pahang River(28 samples) and Kelantan River(22 samples) in the eastern portion of Malay Peninsula are analyzed to decipher the characteristics of REE composition and distribution,to discern the controlling factors of REE composition,and to illustrate the significances of provenance tracing of REE.The results show that the total REE ranges from 24.88 μg/g to 304.29 μg/g,with an average of 165.22 μg/g,for the Pahang River;and 126.02 μg/g to 281.40 μg/g,with an average of 181.15 μg/g,for the Kelantan River,respectively.The UCC standardization of REE indicates that Pahang River sediments enrich with heavy rare earth elements,in relative to light rare earth elements.However,there is no significant difference between light and heavy rare earth elements in the Kelantan River.The composition of source rocks and minerals plays a controlling role in the REE composition of the two rivers.The influence of chemical weathering in the Pahang River is greater than Kelantan River,and the difference of grain size among the Pahang River sediments leads to larger REE variations.δEu UCC-(Gd/Yb)UCC discrimination diagram demonstrates that it can be used as an effective index to qualitatively seperate the sediment source of two rivers.It can further be used to trace and identify the source of sediments quantitatively on the continental shelf of Malay Peninsula.
引文
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