长江下游下蜀黄土的稀土元素物源判别

通过对长江下游镇江、福家湾、新港、芜湖、福路镇等地区下蜀黄土中稀土元素的研究，结合长江古漫滩堆积物及北方黄土沉积物，对下蜀黄土进行了物源判别，得出：下蜀黄土与长江河漫滩之间的各稀土元素的 DF 值绝大部分小于0．2，表现出在各个稀土元素上与河漫滩的接近程度较大，而与北方黄土接近程度较小；由物源指数 PI 计算得出，新港、福路镇、镇江下蜀黄土 PI 值均在0．2附近，表现出下蜀黄土与河漫滩在稀土元素总体上的相似程度极高，物源判别为长江河漫滩；福家湾下蜀黄土物源判别为北方黄土，北方黄土对其有一定影响。总体上，长江下游下蜀黄土受到北方黄土与河漫滩的影响，其中以长江河漫滩影响为主。

Rare Earth Elements Along the Yangtze River Downstream Shu Loess Under the Provenance Discrimination

This article through the research of the rare earth elements of xiashu loess in yangtze river in zhenjiang, fujiawan, xingang, wuhu, fuluzhen, combining with the yangtze river ancient overbank deposits and northern loess sediments, has carried on the provenance discrimination to xiashu loess, and it is concluded that： between xiashu loess and the yangtze river flood land of various rare earth elements for the most part DF values is less than 0.2, showing that xiashu loess is closer to the flood land, and low level close to the northern loess; By calculated PI of source index, the PI value of xiashu loess in xingang, fuluzhen, zhenjiang are near 0.2, showing that the similar degree of the xiashu loess and flood land in rare earth elements on the whole is extremely high, provenance discrimination for the yangtze river flood land; However, the xiashu loess in fujiawan is similar to the northern loess.Overall, the xiashu loess located in lower reaches of yangtze river is affected by flood land and northern loess, and the influence of flood land is larger.