中国黄土地球化学的若干河题

黄土地球化学是研究黄土中元素的分布、分配和迁移、富集的规律。它的研究不仅有助于进一步了解黄土物质成分的特征,而且对探索黄土堆积的地球化学环境,以及黄土形成过程的地球化学实质有重要意义。这些年来,我们继续以黄河中游黄土为重点,结合有关地区,进行了黄土地球化学的研究。

SOME PROBLEMS OF LOESSI GEOCHEMISTRY IN CHINA

In many different, loess deposits the contents of oxides and trace elements are nearly all the same, so is the REE distribution in the clay fraction of loess, though .with regional variations. It shows that the constituents of the loess are uniform. Similarity between the distributional pattern of RRR in loess and that in the sands in Northwest China suggests the similar ity of parent materials. In addition the values of the distributional patterns of REE in loess and its clay fraction apprxmate that of the earth's crust, and are also comparable to those of sedimentary rocks (i.e.N.A.S.) but the differ from those of spherulitic meteorites.