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Regular distribution patterns of elements Ca, Sr, K, Na, Mg, Fe, Mn, Ti, Cu, Co, Ni,Zn, Ph, Cr, Rb, Ba, Cd, and U in Late Quaternary strata have been studied in detail. The regional variation patterns of elements in these strata are similar to those in recent surface sediments, showing that the sedimentary environment has been relatively stable since Late Quaternary. Element distribution changes with the variations of lithologtcal characters. Contents of Ca and Sr increase in coarse sediments, while those of other elements decrease. Na content increases in the pumice layer, Mn content tends to increase sharply towards the surface layer. Ca content decreases sharply in strata where water depth is more than 2,000m.The strata can be divided based on the distribution curves of element assemblages. The variations in contents of most elements in Holocene Series are smaller than those in Late Pleistocene Series, which might be related to the factors of glacial and interglacial changes, sea level fluctuations a 相似文献
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黄海表层沉积物稀土元素地球化学 总被引：26，自引：2，他引：26
对黄海表层沉积物稀土元素地球化学研究表明,沉积物中RE_2O_3含量为175ppm。稀土元素分布模式和东海的相似,即以负斜率和Eu负异常为特征,属大陆型稀土分布特征。稀土含量受沉积物粒度和重矿物双重控制,稀土主要赋存于粘土矿物和重矿物中。相关分析表明,稀土元素和亲Fe元素关系密切,其中和元素Ti的相关系数最高。稀土元素主要物源是大陆风化搬运碎屑沉积物质。 相似文献
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Determination of the concentrations of. 15 rare earth elements (REE) in China continental shelf sediments by X- ray fluorescent spectral analysis of selected representative sediment samples showed that REE concentration in the sediments is 156 ppm, similar to that in China loess and Fujian granite, but different from that in Pacific sediments. The shelf REE have the characteristic distribution pattern of typical continental crust REE and evidently philo-continental property. The above findings suggest that weathered materials transported from the China continent are the main source of the REE in China continental shelf sediments.Experiments show that REE exist mainly in the crystal lattices of clay minerals ( <2u) as isomorphs and that REE have close relation with most elements (Al, Ti, K, Rb, Fe, etc.) related with clay minerals, but have negative correlation with the biophile elements Ca and Sr. 相似文献
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黄海沉积物硼、氟、铷、锶地球化学及地球化学分类 总被引：1，自引：0，他引：1
对黄海沉积物中B,F,Rb,Sr地球化学研究表明,B,F,Rb,Sr含量受沉积物粒度控制。B,F,Rb随沉积物粒度变小含量增高,富集于粘土矿物中;Sr则相反,富集于碳酸盐中。R型聚类分析表明,黄海沉积物元素基本可分为两大类,即与陆源碎屑有关的B,F,Rb等元素及与自生生物作用有关的Sr,Ca,Mn等元素。Q型聚类分析表明,黄海沉积物可分为三大类,一是现代细粒沉积物,二是残留粗粒沉积物,三为现代粗粒沉积物。 相似文献
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