REE Compositions of the "Wushan Loess" and Its Origin
The rare earth element (REE) compositions of the "Wushan Loess" are studied in order to encipher information on the genesis of the "Wushan Loess". The REE patterns, concentrations and indices are used for the discussion. The results show that REE compositions of the "Wushan Loess" are quite different from those of the modern river sediments and similar to those of the Loess Plateau and the "Xiashu Loess" in the middle and lower Yangtze reaches. REE distribution patterns are similar to those of the typical eolian deposits. The index (PI) calculated by source discriminant function is similar to those of the e-olian deposits, indicating the eolian origin. The average REE content (216. 39×10-6) is significantly higher to the average rate of the earth crust (178. 0×10-6), two samples from the Loess Plateau (178. 22×10-6), and fairly close to the average rate of the samples from the Xiashu loess in the middle and lower Yangtze reaches (207. 7 ×10-6). The light rare earth element (LREE) are relatively enriched, while the heavy rear earth element (HREE) are slightly missing. The ratios of LREE and HREE is 8. 62. The element Eu negative anomaly is obvious; while the element Ce anomaly is not obvious. It indicates that "Wushan" loess has suffered more intense weathering than the Loess Plateau The "Wushan Loess" formed under the same weathering conditions as the "Xiashu Loess".
"Wushan loess"rare earth element (REE)genesisgeochemistry
NETL
NSTL
万方数据
维普
