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对武汉地区第四纪中更新世王家店组(Qp2w)网纹红土采用ICP-MS进行了稀土元素质量分数测定,分析了稀土元素组成与分馏特征,并与渭南黄土和长江沉积物进行了对比。分析表明,Qp2w网纹红土的REE含量除了受沉积物粒度控制之外,还受风化淋溶作用控制。Qp2w网纹红土的Eu负异常,与渭南黄土相比未出现明显的再分馏;Ce异常出现分层现象,分馏复杂;轻重稀土元素分馏比渭南黄土略弱,比长江沉积物弱得多;轻稀土元素分馏比渭南黄土和长江沉积物显著;重稀土元素分馏较渭南黄土和长江沉积物要弱。总体上,Qp2w网纹红土稀土配分模式与渭南黄土更相似。通过物源计算,总结出Qp2w网纹红土具有风积成因的特点,这表明其有可能是黄土高原黄土朝南或东南方向的延伸。
The QP2w reticulate laterite in Wuhan area was measured by ICP-MS, and the REE composition and fractionation characteristics were analyzed. Compared with the Weinan loess and the Yangtze River sediments, . The analysis shows that the REE content of Qp2w reticulate red clay is controlled by the weathering and leaching in addition to the grain size control. The Eu negative anomaly of Qp2w reticulate laterite did not show obvious re-fractionation compared with that of Weinan loess. Ce anomaly stratified phenomenon and complex fractionation. The light and heavy fractionation of rare earth elements was weaker than that of Weinan loess and was much weaker than the Yangtze sediments. REE fractionation is more significant than Weinan loess and the Yangtze River sediments; heavy REE fractional weaker than the Weinan loess and the Yangtze River sediments. In general, Qp2w tracery laterite REE patterns are more similar to Weinan loess. Through the calculation of provenance, it is concluded that the Qp2w reticulate red clay has the characteristics of aeolian origin, which indicates that it may be an extension of loess plateau in the south or southeast direction.